JPH0772180B2 - Method for producing 5-benzylhydantoin - Google Patents
Method for producing 5-benzylhydantoinInfo
- Publication number
- JPH0772180B2 JPH0772180B2 JP60007430A JP743085A JPH0772180B2 JP H0772180 B2 JPH0772180 B2 JP H0772180B2 JP 60007430 A JP60007430 A JP 60007430A JP 743085 A JP743085 A JP 743085A JP H0772180 B2 JPH0772180 B2 JP H0772180B2
- Authority
- JP
- Japan
- Prior art keywords
- benzylhydantoin
- benzylidenehydantoin
- hydrogen
- mol
- catalyst
- 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 - Lifetime
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Landscapes
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Description
【発明の詳細な説明】 イ.作業上の利用分野 本発明は5−ベンジルヒダントインの製造方法に関する
ものである。Detailed Description of the Invention a. TECHNICAL FIELD The present invention relates to a method for producing 5-benzylhydantoin.
5−ベンジルヒダントインは各種有用化合物の合成中間
体として重要な化合物である。例えば、アルカリ加水分
解することにより、医薬・食品に有用なDL−フェニルア
ラニンを得ることができる。5-Benzylhydantoin is an important compound as a synthetic intermediate for various useful compounds. For example, by performing alkaline hydrolysis, DL-phenylalanine useful for medicines and foods can be obtained.
ロ.従来の技術及び問題点 5−ベンジルヒダントインの従来の合成法としては、 (1) フェニルアセトアルデヒド、青化ソーダ、重炭
酸アンモニウムを原料とするBucherer法。(特公昭50-5
702) (2) ベンズアルデヒドとヒダントインを脱水縮合さ
せて、5−ベンジリデンヒダントインを得、次いで還元
して5−ベンジルヒダントインを得る方法。B. Conventional Technology and Problems As the conventional synthetic method of 5-benzylhydantoin, (1) Bucherer method using phenylacetaldehyde, sodium cyanide, and ammonium bicarbonate as raw materials. (Japanese Patent Publication Sho 50-5
702) (2) A method of dehydrating and condensing benzaldehyde and hydantoin to obtain 5-benzylidenehydantoin, and then reducing it to obtain 5-benzylhydantoin.
等の方法が知られている。Etc. are known.
(1)のBucherer法は、原料のフェニルアセトアルデヒ
ドが高価であるうえに不安定であり、反応中に重合物質
が生成し、しかも粗製品は精製が必要である上、精製が
困難である等、工業的に不利な点が多い。In the Bucherer method of (1), phenylacetaldehyde, which is a raw material, is expensive and unstable, a polymerized substance is generated during the reaction, and the crude product needs to be purified, and it is difficult to purify. There are many industrial disadvantages.
これに対し、(2)の方法は、工業的に安価なベンズア
ルデヒド、ヒダントインを原料とし、しかも高純度、高
品質で5−ベンジリデンヒダントインが容易に得られる
という点で有利な方法である。On the other hand, the method (2) is an advantageous method in that industrially inexpensive benzaldehyde and hydantoin are used as raw materials, and that 5-benzylidenehydantoin can be easily obtained with high purity and high quality.
5−ベンジリデンヒダントインの還元方法としては、 (ア) アルカリ性溶媒中で電解還元する方法(I.G.Ki
celeua:Elektrokhimiya,12,902−6(19-76)) (イ) ラネーニッケルを触媒として高圧水添する方法
(USP 2,479,065(1941)) 等が知られているが、(ア)の方法では5−ベンジリデ
ンヒダントインのアルカリ分解が避けられず、収率が高
々90%止まりであり、(イ)の方法は700気圧余りの高
圧を要する上、触媒量も多く、設備的・経済的に不利で
ある、という不備な点を有していた。As a reduction method of 5-benzylidenehydantoin, (a) a method of electrolytic reduction in an alkaline solvent (IGKi
celeua: Elektrokhimiya, 12 , 902-6 (19-76)) (a) High-pressure hydrogenation using Raney nickel as a catalyst (USP 2,479,065 (1941)) and the like are known. Alkali decomposition of benzylidene hydantoin is unavoidable, the yield is 90% at most, and the method (a) requires a high pressure of more than 700 atm and also has a large amount of catalyst, which is disadvantageous in terms of equipment and economy. I had a flaw.
ハ.問題点を解決するための手段 本発明者らは、鋭意検討の結果、活性炭を担体としたパ
ラジウムを触媒とすることにより、5−ベンジリデンヒ
ダントインに対し0.2〜2wt%の触媒量、5〜15kg/cm2の
圧力下で定量的に5−ベンジルヒダントインが得られる
ことを見い出し、本発明を完成するに至った。C. Means for Solving the Problems The present inventors have earnestly studied, and as a result, by using palladium with activated carbon as a catalyst, a catalyst amount of 0.2 to 2 wt% relative to 5-benzylidenehydantoin, 5 to 15 kg / It was found that 5-benzylhydantoin was quantitatively obtained under a pressure of cm 2 , and the present invention was completed.
本発明に使用する触媒は活性炭を担体とするパラジウム
であり、パラジウム担持量は2〜10%、好ましくは5%
程度がよい。また、含水品であっても、乾燥品であって
もよい。The catalyst used in the present invention is palladium having activated carbon as a carrier, and the amount of palladium supported is 2 to 10%, preferably 5%.
The degree is good. Further, it may be a water-containing product or a dry product.
触媒量としては、5−ベンジリデンヒダントインに対し
0.2〜2wt%、好ましくは0.5〜5wt%である。これ以上だ
と経済的に不利であり、逆に少ないと十分な反応速度が
得られず実用的でない。The amount of catalyst was 5 benzylidene hydantoin.
0.2-2 wt%, preferably 0.5-5 wt%. If it is more than this, it is economically disadvantageous. On the contrary, if it is less than this, a sufficient reaction rate cannot be obtained, which is not practical.
水素圧は5〜15kg/cm2がよく、好ましくは8〜10kg/cm2
である。圧力が高すぎると、芳香環の水添等により5−
ベンジルヒダントインの選択率が低下し、逆に低すぎる
と十分な反応速度が得られない。The hydrogen pressure is preferably 5 to 15 kg / cm 2 , preferably 8 to 10 kg / cm 2.
Is. If the pressure is too high, the hydrogenation of the aromatic ring may cause 5-
The selectivity of benzylhydantoin decreases, and if it is too low, a sufficient reaction rate cannot be obtained.
反応温度は80〜120℃、好ましくは、90〜110℃である。
温度が高いと、5−ベンジルヒダントインの選択率の低
下を招き、逆に低いと、十分な反応速度が得られない。The reaction temperature is 80 to 120 ° C, preferably 90 to 110 ° C.
When the temperature is high, the selectivity of 5-benzylhydantoin is lowered, and when the temperature is low, a sufficient reaction rate cannot be obtained.
溶媒としてはアルコール類が用いられ、例えば、メタノ
ール、エタノール等のアルコール類が挙げられる。水の
添加は5−ベンジリデンヒダントインの溶解度を下げる
ので余り好ましくない。Alcohols are used as the solvent, and examples thereof include alcohols such as methanol and ethanol. The addition of water is less preferred because it reduces the solubility of 5-benzylidenehydantoin.
5−ベンジリデンヒダントインの濃度は5〜30wt%、好
ましくは10〜20wt%である。濃度が低いと生産の効率が
悪く、逆に高すぎるとスラリー濃度が大きくなり、操作
上困難である。The concentration of 5-benzylidenehydantoin is 5 to 30 wt%, preferably 10 to 20 wt%. If the concentration is low, the production efficiency will be poor, while if it is too high, the slurry concentration will be high, making it difficult to operate.
反応時間は0.5〜3時間、好ましくは1〜2時間であ
る。長すぎると5−ベンジリデンヒダントインが更に水
添され収率の低下を招く。The reaction time is 0.5 to 3 hours, preferably 1 to 2 hours. If it is too long, 5-benzylidenehydantoin is further hydrogenated, resulting in a decrease in yield.
ニ.実施例 以下、実施例において本発明について更に具体的に説明
する。但し、これらは単なる例示であり、本発明はこれ
らの例に何ら制限を受けない。D. EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples. However, these are merely examples, and the present invention is not limited to these examples.
実施例1 5−ベンジリデンヒダントイン7.52g(0.040mol)、メ
タノール50ml、及び5%Pd/C 0.075gを、撹はん機を備
えた100mlオートクレーヴ(sus316)に仕込み、系内を
窒素及び水素でそれぞれ2回洗浄した後、水素を8kg/cm
2封入し、昇温した。90℃にて1時間反応させたとこ
ろ、5−ベンジルヒダントインが7.57g(0.0398mol)生
成していた。5−ベンジリデンヒダントイン基準の収率
99.6%であった。Example 1 5-Benzylidenehydantoin 7.52 g (0.040 mol), methanol 50 ml, and 5% Pd / C 0.075 g were charged into a 100 ml autoclave (sus316) equipped with a stirrer, and the system was purged with nitrogen and hydrogen. After washing twice for each, hydrogen 8kg / cm
2 sealed and heated. When reacted at 90 ° C. for 1 hour, 7.57 g (0.0398 mol) of 5-benzylhydantoin was formed. Yield based on 5-benzylidene hydantoin
It was 99.6%.
実施例2 5−ベンジリデンヒダントイン7.52g(0.040mol)、エ
タノール50ml、及び5%Pd/C 0.040gを、撹はん機を備
えた100mlオートクレーヴ(sus316)に仕込み、系内を
窒素及び水素でそれぞれ2回洗浄した後、水素を10kg/c
m2封入し、昇温した。100℃にて1.5時間反応させたとこ
ろ、5−ベンジルヒダントインが7.52g(0.0396mol)生
成していた。5−ベンジリデンヒダントイン基準の収率
98.9%であった。Example 2 7.52 g (0.040 mol) of 5-benzylidenehydantoin, 50 ml of ethanol, and 0.040 g of 5% Pd / C were charged into a 100 ml autoclave (sus316) equipped with a stirrer, and the system was purged with nitrogen and hydrogen. After washing twice each, 10kg / c of hydrogen
m 2 was enclosed and the temperature was raised. When reacted at 100 ° C. for 1.5 hours, 7.52 g (0.0396 mol) of 5-benzylhydantoin was produced. Yield based on 5-benzylidene hydantoin
It was 98.9%.
比較例1 5−ベンイリデンヒダントイン7.52g(0.040mol)、メ
タノール50ml、及び5%Pd/C 0.010gを、撹はん機を備
えた100mlオートクレーヴ(sus316)に仕込み、系内を
窒素及び水素でそれぞれ2回洗浄した後、水素を10kg/c
m2封入し、昇温した。90℃にて3.5時間反応させたとこ
ろ、5−ベンジルヒダントインが5.09g(0.0268mol)生
成していた。5−ベンジリデンヒダントイン基準の収率
67.0%であった。Comparative Example 1 7.52 g (0.040 mol) of 5-benzylidenehydantoin, 50 ml of methanol, and 0.010 g of 5% Pd / C were charged into a 100 ml autoclave (sus316) equipped with a stirrer, and nitrogen and After washing twice with hydrogen, 10 kg / c of hydrogen
m 2 was enclosed and the temperature was raised. When reacted at 90 ° C. for 3.5 hours, 5.09 g (0.0268 mol) of 5-benzylhydantoin was produced. Yield based on 5-benzylidene hydantoin
It was 67.0%.
比較例2 5−ベンジリデンヒダントイン7.52g(0.040mol)、メ
タノール50ml、及び5%Pd/C 0.075gを、撹はん機を備
えた100mlオートクレーヴ(sus316)に仕込み、系内を
窒素及び水素でそれぞれ2回洗浄した後、水素を8kg/cm
2封入し、昇温した。150℃にて1時間反応させたとこ
ろ、5−ベンジルヒダントインが6.47g(0.0340mol)生
成していた。5−ベンジリデンヒダントイン基準の収率
85.1%であった。Comparative Example 2 7.52 g (0.040 mol) of 5-benzylidenehydantoin, 50 ml of methanol, and 0.075 g of 5% Pd / C were charged into a 100 ml autoclave (sus316) equipped with a stirrer, and the system was purged with nitrogen and hydrogen. After washing twice for each, hydrogen 8kg / cm
2 sealed and heated. When reacted at 150 ° C. for 1 hour, 6.47 g (0.0340 mol) of 5-benzylhydantoin was formed. Yield based on 5-benzylidene hydantoin
It was 85.1%.
Claims (1)
ンジリデンヒダントインに対し、0.2〜2wt%の活性炭を
担体としたパラジウムを触媒として、アルコール類を溶
媒に80〜120℃、5〜15kg/cm2の水素圧にて水添するこ
とを特徴とする5−ベンジルヒダントインの製造方法。1. 5-Benzylidenehydantoin is used as a catalyst in which palladium is used as a carrier with 0.2 to 2 wt% of activated carbon as a catalyst based on 5-benzylidenehydantoin, and alcohols are used as a solvent at 80 to 120 ° C. at 5 to 15 kg / cm 2 . A method for producing 5-benzylhydantoin, which comprises hydrogenating under hydrogen pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60007430A JPH0772180B2 (en) | 1985-01-21 | 1985-01-21 | Method for producing 5-benzylhydantoin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60007430A JPH0772180B2 (en) | 1985-01-21 | 1985-01-21 | Method for producing 5-benzylhydantoin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61167669A JPS61167669A (en) | 1986-07-29 |
| JPH0772180B2 true JPH0772180B2 (en) | 1995-08-02 |
Family
ID=11665645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60007430A Expired - Lifetime JPH0772180B2 (en) | 1985-01-21 | 1985-01-21 | Method for producing 5-benzylhydantoin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0772180B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2479065A (en) | 1945-09-06 | 1949-08-16 | Du Pont | Preparation of 5-benzylhydantoin |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2276665A1 (en) * | 1974-06-26 | 1976-01-23 | Kraftwerk Union Ag | INSTALLATION OF A NUCLEAR REACTOR WITH A SAFETY DEVICE IN THE EVENT OF FAILURE OF THE STEAM PIPING |
| JPS59161326A (en) * | 1983-03-01 | 1984-09-12 | Toyo Eng Corp | Manufacturing method of acetaldehyde |
-
1985
- 1985-01-21 JP JP60007430A patent/JPH0772180B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2479065A (en) | 1945-09-06 | 1949-08-16 | Du Pont | Preparation of 5-benzylhydantoin |
Non-Patent Citations (1)
| Title |
|---|
| 日本化学会編「新実験化学講座第15巻−酸化と還元[2−」(昭52−2−20)丸善株式会社,第423頁 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61167669A (en) | 1986-07-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |