JPS5850996B2 - Sesquiterpene derivatives and their production method - Google Patents
Sesquiterpene derivatives and their production methodInfo
- Publication number
- JPS5850996B2 JPS5850996B2 JP11309077A JP11309077A JPS5850996B2 JP S5850996 B2 JPS5850996 B2 JP S5850996B2 JP 11309077 A JP11309077 A JP 11309077A JP 11309077 A JP11309077 A JP 11309077A JP S5850996 B2 JPS5850996 B2 JP S5850996B2
- Authority
- JP
- Japan
- Prior art keywords
- compound
- reaction
- methoxy
- hydroxy
- oxo
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Furan Compounds (AREA)
Description
【発明の詳細な説明】 本発明は、構造式: で表わされる新規な化合物及びその製造法に関する。[Detailed description of the invention] The present invention has the structural formula: This invention relates to a novel compound represented by and a method for producing the same.
本発明に用いる出発物質は種々のジテルペン誘導体、特
にt−アビエチン酸より容易に導くことができる。The starting materials used in the present invention can be easily derived from various diterpene derivatives, especially t-abietic acid.
t−アビエチン酸1は、検相類樹脂の主成分として容易
且つ廉価に入手することができ、すでにその立体構造を
含めて構造式が確定されて積り、その全合成も達成され
ているC W、 H。t-Abietic acid 1 can be easily and inexpensively obtained as the main component of phase detection resins, and its structural formula including its three-dimensional structure has already been determined, and its total synthesis has been achieved. , H.
5hul ler et al eJ、 Am、Che
m、 Soc 、、 83 。5 hul ler et al eJ, Am, Che
m, Soc,, 83.
2563(1961) ; E 、 Wenkert
et al 、J。2563 (1961); Wenkert, E.
et al., J.
Am、Chem、Soc、、86.2038(1964
)等参照〕1゜
本発明によって得られる目的化合物は、天然物として単
離されているフラグロライド
(Fragro l 1de) (A)又はcnから誘
導される例えば夜盗蛾(African army w
orm)に対する強力な摂食阻止物質(antifee
dant )作用を示すアガンデンシジアール(Aga
ndencidialXB)の他に、ベマリボライド(
Bemerivolide工C〕、シンナモスモライド
(Cinnamosmo ] i de) (D)等を
台底する際の重要な中間体として有用である。Am, Chem, Soc, 86.2038 (1964
), etc.] 1゜The target compound obtained by the present invention is fragrolide (A), which is isolated as a natural product, or African army moth (African army w) derived from cn.
A powerful antifeedant against
dant) action.
ndencidialXB), bemaribolide (
It is useful as an important intermediate in the production of Cinnamosmolide (C), Cinnamosmolide (D), etc.
C1,Kuboy Yue−Weilee、M、Pe
tteLF、pHkiwicz and K−Naka
nishiChem、 Comm、、 1976. 1
013 ;Tetrahedron LettersA
23. pp。C1, Kuboy Yue-Weilee, M, Pe
tteLF, pHkiwicz and K-Naka
nishiChem, Comm, 1976. 1
013 ;Tetrahedron Letters A
23. pp.
2137 2141 ; Tetrahedron
Vol 。2137 2141; Tetrahedron
Vol.
25.3895〜3902;同Vo1.25゜3903
〜3908等参照〕。25.3895-3902; Vo1.25°3903
-3908 etc.].
以下に、本発明を詳述する。The present invention will be explained in detail below.
本発明の出発物質である6−アセトキシ−14ヒドロキ
シ体10は、以下に述べる如く、既知の方法(A、Ta
hara and H,Akita、 Chem。The 6-acetoxy-14 hydroxy compound 10, which is the starting material of the present invention, can be obtained by a known method (A, Ta
Hara and H, Akita, Chem.
Pharm、Bull(Tokyo)23 1976(
1975)。Pharm, Bull (Tokyo) 23 1976 (
1975).
同23,1984(1975);特許第939593号
(特公昭53−24069号公報参照)及び特開昭54
−46763号公報、同54−46764号公報記載の
方法〕により得ることができる。23, 1984 (1975); Patent No. 939593 (see Japanese Patent Publication No. 53-24069) and Japanese Unexamined Patent Publication No. 54
It can be obtained by the method described in Japanese Patent No. 46763 and Japanese Patent No. 54-46764.
次いで得られた7−オキソ−14−メトキシ体(21(
3)をエノールアセテート化して14−メトキシルエノ
ールアセテ−ト体(4)を得る。Then, the obtained 7-oxo-14-methoxy compound (21(
3) is converted into enol acetate to obtain 14-methoxyl enol acetate (4).
得られた14−メトキシ−エノールアセテート体(4)
を過酸処理して主生成物として6−アセドキシー7−オ
キソー14−メトキシ体(6)と副生物の6−ヒトロキ
シー7−オキソー14−メトキシ体(5)を得る。Obtained 14-methoxy-enol acetate (4)
is treated with peracid to obtain 6-acedoxy 7-oxo 14-methoxy form (6) as the main product and 6-hydroxy 7-oxo 14-methoxy form (5) as a by-product.
又上記6−ヒトロキシー7−オキソー14−メトキシ体
(5)をアセチル化しても6−アセドキシー7−オキソ
ー14−メトキシ体(6)を得ることができる。Furthermore, 6-acedoxy7-oxo14-methoxy form (6) can also be obtained by acetylating the above 6-hydroxy7-oxo14-methoxy form (5).
これを具体的に示せば次の如くである。This can be concretely shown as follows.
すなわち、前記化合物(2)、 (3)を酢酸イソプロ
ペニルとパラトルエンスルフォン酸(p−TSOH)を
加えて反応せしめ、14−メトキシ−エノールアセテー
ト体(4)を得る。That is, the compounds (2) and (3) are reacted by adding isopropenyl acetate and para-toluenesulfonic acid (p-TSOH) to obtain 14-methoxy-enol acetate (4).
反応温度、反応時間はそれぞれ20〜120℃、12〜
72時間が適当である。The reaction temperature and reaction time are 20-120℃ and 12-120℃, respectively.
72 hours is appropriate.
得られた14−メトキシ−エノールアセテート体(4)
を溶媒中、過酸を加えて過酸処理を行なう・この場合過
酸としてはm−クロロ過安息香酸(MCPBAλ過安息
香酸、過酢酸、過フタル酸、過マレイン酸素を用いつる
が、m−クロロ過安息香酸を用いるとよい結果が得られ
る。Obtained 14-methoxy-enol acetate (4)
in a solvent and perform peracid treatment by adding peracid. In this case, the peracid used is m-chloroperbenzoic acid (MCPBAλ perbenzoic acid, peracetic acid, perphthalic acid, permaleic acid, but m- Good results are obtained with chloroperbenzoic acid.
溶媒はクロロホルム、塩化メチレン等のハロゲン化炭化
水素を用いるのが適当であり、反応温度、反応時間はそ
れぞれ0〜20℃、12〜36時間か適当である。It is appropriate to use a halogenated hydrocarbon such as chloroform or methylene chloride as the solvent, and the reaction temperature and reaction time are 0 to 20°C and 12 to 36 hours, respectively.
かくして6−ヒトロキシー7−オキソー14−メトキシ
体(5)及び6−アセドキシー7−オキソー14−メト
キグ本6)を得る。In this way, 6-hydroxy 7-oxo 14-methoxy compound (5) and 6-acedoxy 7-oxo 14-methoxy compound 6) are obtained.
又、得られた6−ヒトロキシー7−オキソー14−メト
キシ体5)ヲ無水酢酸等のアセチル化剤を用いてアセチ
ル化しても6−アセドキシー7−オキソー14−メトキ
シ体(6)を得ることができる。Furthermore, even if the obtained 6-hydroxy 7-oxo 14-methoxy compound 5) is acetylated using an acetylating agent such as acetic anhydride, the 6-acetoxy 7-oxo 14-methoxy compound (6) can be obtained. can.
この際、ピリジン等の塩基性溶媒中で反応を行なうのが
好ましく、反応温度、反応時間はそれぞれ0〜25℃、
12〜36時間が適当である。At this time, it is preferable to carry out the reaction in a basic solvent such as pyridine, and the reaction temperature and reaction time are 0 to 25°C, respectively.
12 to 36 hours is suitable.
かくして得られた6−アセドキシー7−オキソー14−
メトキシ体(6)全無水ベンゼン、四塩化炭素等の溶媒
に溶かし、塩化アルミニウムを加えて反応を行なう。The thus obtained 6-acedoxy7-oxo14-
Methoxy compound (6) is dissolved in a solvent such as completely anhydrous benzene or carbon tetrachloride, and aluminum chloride is added to carry out the reaction.
この際の反応温度は0〜30℃が適当であるが、室温で
充分であり、又反応時間は05〜4時間が適当である。The reaction temperature at this time is suitably 0 to 30°C, but room temperature is sufficient, and the reaction time is suitably 05 to 4 hours.
上記反応により、主生成物として6−アセドキシー7−
オキソー13−イソプロピル−14−ヒドロキシ体(7
)が、副生成物として6−アセドキシー7−オキソー1
4−ヒドロキシ体(8)が得られる。The above reaction produces 6-acedoxy7- as the main product.
Oxo-13-isopropyl-14-hydroxy form (7
) produces 6-acedoxy7-oxo1 as a by-product.
A 4-hydroxy compound (8) is obtained.
得られた6−アセドキシー7−オキソー13−イソプロ
ピル−14−ヒドロキシ体(7)をメタノール溶媒中で
水素化ホウ素ナトリウムを加えて反応せしめる。The obtained 6-acedoxy-7-oxo-13-isopropyl-14-hydroxy compound (7) is reacted with sodium borohydride in a methanol solvent.
この反応は水冷下で行なうのが好ましく、反応時間は1
〜4時間が適当である。This reaction is preferably carried out under water cooling, and the reaction time is 1
~4 hours is appropriate.
上記反応により、6−アセドキシー7.14−ジヒドロ
キシ体(9)を得る。The above reaction yields 6-acedoxy-7,14-dihydroxy form (9).
これは精製せずに次の接触還元反応に付す。This is subjected to the next catalytic reduction reaction without purification.
すなわち、得られた6−アセドキシー7.14−ジヒド
ロキシ体(9)を10%Pd−Cを用いて中圧接触還元
(水素圧:2,8〜2、9 kg/crti ) f行
なう。That is, the obtained 6-acedoxy7.14-dihydroxy compound (9) is subjected to medium pressure catalytic reduction (hydrogen pressure: 2.8 to 2.9 kg/crti) using 10% Pd-C.
かくして本発明の出発物質である6−アセトキシ−14
−ヒドロキシ体(1o)が主生成物として、又14−ヒ
ドロキシ[1)が副生成物として得られる。Thus, the starting material of the present invention, 6-acetoxy-14
-Hydroxy form (1o) is obtained as the main product, and 14-hydroxy [1] is obtained as a by-product.
かくして得られた出発物質の6−アセトキシ−14−ヒ
ドロキシ体α0)ヲオゾン酸化して芳香性C環を開裂せ
しめた後、還元剤で処理して6−アセトキシラクトン体
と11−メトキシ−6−アセトキシラクトン体を得る。The 6-acetoxy-14-hydroxy form of the starting material α0) thus obtained was oxidized with ozone to cleave the aromatic C ring, and then treated with a reducing agent to form 6-acetoxylactone form and 11-methoxy-6-acetoxy form. Obtain lactone body.
この反応はメタノール又はメタノール混合溶媒中で行な
うのが好ましく、例えばCH2C4−CH30H1クロ
ロホルム−CH30H,酢酸エチル−CH30H等を用
いて行なう。This reaction is preferably carried out in methanol or a mixed solvent of methanol, for example using CH2C4-CH30H1 chloroform-CH30H, ethyl acetate-CH30H, etc.
オゾン量は充分反応が進行するように大過剰量用いるの
がよく、反応温度は一80〜o℃の範囲が適当である。The amount of ozone is preferably used in large excess so that the reaction proceeds sufficiently, and the reaction temperature is suitably in the range of -80°C to 0°C.
又、還元剤としては、例えば、接触還元剤(10%Pb
触媒)、水素化ホウ素す) IJウム、亜硫酸ソーダ、
亜鉛−酢酸、ジメチルスルフィド等を用いることかでき
るが、水素化ホウ素ナトリウムが最適である。Further, as a reducing agent, for example, a catalytic reducing agent (10% Pb
catalyst), boron hydride) IJium, sodium sulfite,
Although zinc-acetic acid, dimethyl sulfide, etc. can be used, sodium borohydride is most suitable.
反応温度、反応時間はそれぞれ0〜30℃、30分〜1
2時間が適当であり、溶媒は通常還元に用いられるもの
を用い得るが、CH2C4−CH30H,C2H50H
−H2O,水、酢酸等を用いるのがよい。Reaction temperature and reaction time are 0 to 30°C, 30 minutes to 1
2 hours is appropriate, and solvents commonly used for reduction can be used, but CH2C4-CH30H, C2H50H
-H2O, water, acetic acid, etc. are preferably used.
かくして、6−アセトキシラクトン体α2)と本発明の
目的化合物である6−アセトキシ−11−メトキシラク
トン体(I3)とを混合物として得るが、これらは、シ
リカゲルカラムクロマトグラフィー等により、それぞれ
容易に分離することができる。In this way, 6-acetoxylactone α2) and 6-acetoxy-11-methoxylactone (I3), which is the target compound of the present invention, are obtained as a mixture, but these can be easily separated by silica gel column chromatography or the like. can do.
次に具体例を挙げて説明する。Next, a specific example will be given and explained.
出発物質の4,4−ジメチル−6−アセトキシ−13−
イソプロピル−14−ヒドロキシ体(10う((10)
において、R1、R2−CH3、R3=イソプロピル基
〕をCH2C42−MeOHに溶かし、ドライアイス−
アセトン冷却下、オゾンを吹き込む。Starting material 4,4-dimethyl-6-acetoxy-13-
Isopropyl-14-hydroxy form (10)
In this step, R1, R2-CH3, R3 = isopropyl group] was dissolved in CH2C42-MeOH and placed on dry ice-
Blow in ozone while cooling with acetone.
その後室温に戻してN a BH4−C2H50H−R
20そ加え室温で撹拌する。After that, return to room temperature and N a BH4-C2H50H-R
Add 20ml and stir at room temperature.
反応終了後、水を加えてエーテルから抽出する。After the reaction is complete, add water and extract from ether.
水層は10%塩酸溶液で酸性にした後クロロホルムから
抽出する。The aqueous layer is acidified with 10% hydrochloric acid solution and then extracted from chloroform.
エーテル層(中性部)及びクロロホルム層(酸性部)を
。ether layer (neutral part) and chloroform layer (acidic part).
各々飽和食塩水で洗い、Na2SO4で脱水乾燥後、溶
媒を溜去すると油状物を得る。After washing with saturated saline and dehydrating and drying over Na2SO4, the solvent was distilled off to obtain an oil.
両者を合わせ、シリカゲルクロマトに付し、石油エーテ
ル:エーテル=1:1の溶出部から本発明の目的化合物
の単一な油状物(放置すると結晶化)の4,4−ジメチ
ル−6−アセトキシ−11−メトキシラクトン体α3)
を、次いで単一な油状物の4,4−ジメチル−6−アセ
ドキシーラクトン体(12)を得る。Both were combined and subjected to silica gel chromatography, and from the eluate of petroleum ether: ether = 1:1, a single oily substance (crystallized when left standing) of the target compound of the present invention, 4,4-dimethyl-6-acetoxy- 11-methoxylactone α3)
Then, a single oily 4,4-dimethyl-6-acedoxy lactone (12) is obtained.
これを、図に示せば次の如くである。This is illustrated in the figure below.
次に本発明を実施例によって説明するが、本発明はこれ
に限定されるものではない。Next, the present invention will be explained by examples, but the present invention is not limited thereto.
実施例 1
前記化合物(10’) 2.063 l−CH2C,
12(20yrdl ) −MeOH(2Qml)に溶
かし、 トライアイス−アセトン冷却下オゾンを1時間
吹き込む。Example 1 Compound (10') 2.063 l-CH2C,
12(20yrdl)-MeOH (2Qml), cooled with triice-acetone, and blown with ozone for 1 hour.
その後室温に戻してN a BH,i (15y) −
50%(v/v ) E t OHR20(30mA)
を加え室温で30分間撹拌する。After that, return to room temperature and N a BH,i (15y) −
50% (v/v) E t OHR20 (30mA)
and stir at room temperature for 30 minutes.
反応終了後、水を加えてエーテルから抽出する。After the reaction is complete, add water and extract from ether.
水層は10%HC1aqで酸性にした後クロロホルムか
ら抽出する。The aqueous layer is acidified with 10% HC1aq and then extracted from chloroform.
エーテル層(中性部)及びクロロホルム層(酸性部)を
各々飽和食塩水で洗い、Na2SO4で脱水乾燥後、溶
媒を溜去すると各々から油状物を得る。The ether layer (neutral part) and chloroform layer (acidic part) were each washed with saturated brine, dehydrated and dried over Na2SO4, and the solvent was distilled off to obtain an oily substance from each.
両者(2,207P)を合わせ、シリカゲル902を用
いてカラムクロマトに対し、石油エーテルニエーテル−
1:1の溶出部から本発明の目的化合物である単一な油
状物(放置すると結晶化)R3)2171n9(11,
2%)を、次いで単一な油状物(12)941■(53
,7%)を分離し得た。Both (2,207P) were combined and subjected to column chromatography using silica gel 902.
From the 1:1 elution fraction, a single oil (crystallizes when left standing) which is the target compound of the present invention R3) 2171n9 (11,
2%), then a single oil (12)941■(53
, 7%) could be separated.
〔化合物02)の物理的性質〕
元素分析:(高分解能質量分析法による)分子式: C
17R2404
計算値:292.167
実測値:292.167
IR;I/CC’ 1740゜
aX
1235CrIL−1
(7ct−OAc )
1765.1695C1n−’ (ct、β(−不飽和
γ−ラクトン)
NMR(CDC73):δ”96)+nyeTL s
、 3H)
100MHz 1.11) (4−gefTIM
o)1.26 s、3H(10−Me)
1.70
d、IH
J=12Hz(5−H)
2.60 s、3H(6α−0Ac)
■・94〜2.32 )合出、、IH
)(7−R2)
2.70〜3.03 )
4.63〜4.72 (4,67)m 、 2H(11
−R2)
5.23〜5.51m(へ重線)
、IH(6β−H)
NMR(CDCl2):δ
60 MHz
0°98)それぞれ5w3H
)
tlo ) (4−gerryMie )1.26
s、3H(10−Me)
1.67 d = IHJ−12Hz
(5−H)
2.07 s、3H
(6α−0Ac::
1.89〜2.36
2.60〜3,13
七nぞnm。[Physical properties of compound 02] Elemental analysis: (by high-resolution mass spectrometry) Molecular formula: C
17R2404 Calculated value: 292.167 Actual value: 292.167 IR; I/CC' 1740°aX 1235CrIL-1 (7ct-OAc) 1765.1695C1n-' (ct, β (-unsaturated γ-lactone) NMR (CDC73 ): δ”96)+nyeTL s
, 3H) 100MHz 1.11) (4-gefTIM
o) 1.26 s, 3H (10-Me) 1.70 d, IH J=12Hz (5-H) 2.60 s, 3H (6α-0Ac) ■・94~2.32) Combined,, IH )(7-R2) 2.70~3.03) 4.63~4.72 (4,67)m, 2H(11
-R2) 5.23-5.51 m (heavy line), IH (6β-H) NMR (CDCl2): δ 60 MHz 0°98) respectively 5w3H) tlo) (4-gerryMie) 1.26
s, 3H (10-Me) 1.67 d = IHJ-12Hz (5-H) 2.07 s, 3H (6α-0Ac:: 1.89 ~ 2.36 2.60 ~ 3,13 7 nzo nm.
1H(7−H2)
4.59−4.73 (4,65)m 、 2H(11
−H2)
5.10−5.60m(へ重線)。1H(7-H2) 4.59-4.73 (4,65)m, 2H(11
-H2) 5.10-5.60m (heavy line).
1H(6β−H)
〔本発明の目的化合物03)の物理的性質〕元素分析=
(高分解能質量分析法による)分子式:Cl8H260
5
計算値:322.178
実測値:322.176
IRニジC”4 1740,1235crfL−’aX
(6α−0Ac)
1766Crn−1(α、β−
(不飽和γ−ラクトン)
NMR(CDC,!3)
60 MHz
δ1.00 )
)
1.10)
それぞれs、3H
(4−gem Me)
1.30
s*3H
(1o−Me)
1.57
d 、IH
J=12Hz(5−H)
2.09 s、3H(6α−0Ac)
3.59 s、3H(11−OMe)
5.19〜5.58m、IH
(6β−H)
5.66 br、s、W h/2
=4.8Hz (11−H)1H(6β-H) [Physical properties of target compound 03 of the present invention] Elemental analysis=
Molecular formula (according to high-resolution mass spectrometry): Cl8H260
5 Calculated value: 322.178 Actual value: 322.176 IR NijiC"4 1740,1235crfL-'aX (6α-0Ac) 1766Crn-1 (α, β- (unsaturated γ-lactone) NMR (CDC,!3 ) 60 MHz δ1.00 ) ) 1.10) s, 3H (4-gem Me) 1.30 s*3H (1o-Me) 1.57 d, IH J=12Hz (5-H) 2.09 s, 3H (6α-0Ac) 3.59 s, 3H (11-OMe) 5.19-5.58 m, IH (6β-H) 5.66 br, s, W h/2 = 4.8Hz (11 -H)
Claims (1)
ノール存在下で、オゾン酸化して芳香性C環を開裂せし
めた後、 環元剤で処理して、構造式: で表わされる化合物を得ることを特徴とするセスキテル
ペン誘導体の製造法。[Claims] 1. A sesquiterpene derivative represented by the structural formula: 2 Using a compound represented by the structural formula: as a starting material, the compound is oxidized with ozone in the presence of methanol to cleave the aromatic C ring, and then treated with a ring-forming agent to form a compound represented by the structural formula: A method for producing a sesquiterpene derivative, the method comprising obtaining a compound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11309077A JPS5850996B2 (en) | 1977-09-20 | 1977-09-20 | Sesquiterpene derivatives and their production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11309077A JPS5850996B2 (en) | 1977-09-20 | 1977-09-20 | Sesquiterpene derivatives and their production method |
Related Child Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4533780A Division JPS55149275A (en) | 1980-04-07 | 1980-04-07 | Preparation of sesquiterpene derivative |
| JP4533880A Division JPS5850221B2 (en) | 1980-04-07 | 1980-04-07 | Method for producing sesquiterpene derivatives |
| JP4533680A Division JPS55149274A (en) | 1980-04-07 | 1980-04-07 | Preparation of sesquiterpene derivative |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5446772A JPS5446772A (en) | 1979-04-12 |
| JPS5850996B2 true JPS5850996B2 (en) | 1983-11-14 |
Family
ID=14603217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11309077A Expired JPS5850996B2 (en) | 1977-09-20 | 1977-09-20 | Sesquiterpene derivatives and their production method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5850996B2 (en) |
-
1977
- 1977-09-20 JP JP11309077A patent/JPS5850996B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5446772A (en) | 1979-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Hendrickson et al. | A new 7-ring cycloaddition reaction | |
| Danishefsky et al. | A concise and stereoselective route to the predominant stereochemical pattern of the tetrahydropyranoid antibiotics: an application to indanomycin | |
| Kernan et al. | The luffariellins, novel antiinflammatory sesterterpenes of chemotaxonomic importance from the marine sponge Luffariella variabilis | |
| Szántay et al. | Synthesis of protoemetine. A new total synthesis of emetine | |
| Wenkert et al. | Synthesis of some drimanic sesquiterpenes | |
| Valenta et al. | The stereochemistry of quassin | |
| Carmely et al. | The sipholanes, a novel group of triterpenes from the marine sponge Siphonochalina siphonella | |
| Wolinsky et al. | Stereospecific synthesis of iridomyrmecin and related iridolactones | |
| Wiley et al. | Structure of pactamycin | |
| Lavie et al. | The constituents of Carapa guianensis Aubl. and their biogenetic relationship | |
| Kupchan et al. | Tumor inhibitors. LXXXVI. Structural elucidation of novel tumor-inhibitory sesquiterpene lactones from Eupatorium cuneifolium | |
| Bélanger et al. | Syntheses of 8-acetoxy-4-twistanone, twistane, 1-twistanol, 1-twistylamine, and 1-twistane carboxylic acid | |
| Kometani et al. | Pyranonaphthoquinone antibiotics. 3. Synthesis of (+)-9-deoxygriseusin B and absolute configuration revision of griseusins A and B | |
| Albert et al. | Dual reactivity of 3, 3-dimethoxycyclopropene | |
| JP3891586B2 (en) | Process for producing 8α, 12-oxide-13,14,15,16-tetranorlabdane | |
| ITOKAWA et al. | A novel sesquiterpene peroxide from Alpinia japonica (Thunb.) MIQ. | |
| JPS5850996B2 (en) | Sesquiterpene derivatives and their production method | |
| Shin et al. | . ALPHA.,. BETA.-Unsaturated carboxylic acid derivatives. XVI. Synthesis and configuration of Diels-Alder adducts from ethyl 3-nitro-2-alkenoate and 1, 3-butadiene. | |
| Grieco et al. | Helenanolides: stereocontrolled total synthesis of dl-bigelovin, dl-mexicanin I, and dl-linifolin A | |
| Gorodetsky et al. | Oxidation of testosterone acetate with per acids | |
| Masamune et al. | The synthesis of veratramine | |
| US3196164A (en) | Derivatives of lactones obtained from plants of the family compositae | |
| Matsumoto et al. | The C (1)–C (10) Bond Cleavage and B Ring Aromatization of Some 6-Hydroxy-5β H-abieta-6, 8, 11, 13-tetraen-18-oic Acid 18, 6-Lactones | |
| JPS5850221B2 (en) | Method for producing sesquiterpene derivatives | |
| Ungur et al. | Interaction of 6, 7-epoxygeranyl acetate and of 10, 11-epoxy-(E, E)-farnesyl acetate with fluorosulfonic acid |