Abstract:
PURPOSE: A method for preparing chiral amino acid ester having high stereoselectivity is provided to economically and simply produce N-acyl amino acid ester of highly optical selectivity. CONSTITUTION: A bifunctional organic chiral catalyst compound is denoted by chemical formula 1. A method for preparing the bifunctional chiral organic catalyst comprises a step of reacting amine with 3,4-alkoxy-3-cyclobutene-1,2-dione derivative. A chiral N-acyl amino acid ester is prepared from azlactone by reacting racemic azlactone, (S)-azlactone or (R)-azlactoen with nucleophile under the presence of organic solvent.
Abstract:
본 발명은 라세믹 또는 키랄 아즈락톤으로부터 높은 입체선택성을 갖는 키랄 아미노산 에스터를 수득하는 방법을 제공하며, 여기에 사용되는 유도체화된 이작용성 유기 키랄 촉매 화합물과 그의 제조방법을 제공한다. 현재까지 알려진 제조방법에 따르면, 높은 거울상 입체 선택성을 가지는 N- 아실 아미노산 에스터를 얻기 위하여 저온에서 장시간 반응을 수행해야 한다는 문제점이 있을뿐만 아니라, 수득되는 화합물의 광학 선택성 또한 공업화에 적용시키기에 부족하였다. 본 발명에 따른 촉매 화합물은 신코나 알칼로이드로부터 쉽게 합성이 가능하며, 매우 경제적이며 간편한 방법으로 높은 광학선택성을 갖는 N-아실 아미노산 에스터를 수득할 수 있을 뿐 아니라 자연에 존재하지 않는 (R)-형태의 다양한 N-아실 아미노산 에스터도 높은 광학 순도로 제조할 수 있어 공업화에 유용한 기술로 활용될 것이 예상된다.
Abstract:
PURPOSE: A bifunctional bis-cinchona alkaloid thiourea organic chiral catalyst compound and a method for preparing the same are provided to obtain (R)-type N-acyl amino acid ester of highly optical purity. CONSTITUTION: A bifunctional bis-cinchona alkaloid thiourea organic chiral catalyst compound is denoted by chemical formula 1. In chemical formula 1, R is ethyl group or -CH=CH_2. The bifunctional organic chiral catalyst is obtained by reacting amine with carbothio diimidazole. The amine is obtained from cinchona alkaloid by epimerization. A chiral N-acyl amino acid ester is obtained by reacting N-acyl amino acid, racemic azlactone, (S)-azlactone or (R)-azlactone with neucleophile under the presence of bifunctional chiral organic catalyst. The neucleophile is alcohol or thiol.
Abstract:
PURPOSE: A bifunctional bis-cinchona alkaloid thiourea organic chiral catalyst compound and a method for preparing the same are provided to obtain (R)-type N-acyl amino acid ester of highly optical purity. CONSTITUTION: A bifunctional bis-cinchona alkaloid thiourea organic chiral catalyst compound is denoted by chemical formula 1. In chemical formula 1, R is ethyl group or -CH=CH_2. The bifunctional organic chiral catalyst is obtained by reacting amine with carbothio diimidazole. The amine is obtained from cinchona alkaloid by epimerization. A chiral N-acyl amino acid ester is obtained by reacting N-acyl amino acid, racemic azlactone, (S)-azlactone or (R)-azlactone with neucleophile under the presence of bifunctional chiral organic catalyst. The neucleophile is alcohol or thiol.