N-HETEROCYCLIC CARBENE CATALYZED SYNTHESIS OF N-PHENYLISOXAZOLIDIN-5-ONE DERIVATIVE AND SYNTHESIS OF β-AMINO ACID ESTER DERIVATIVE
申请人:Zhang Yugen
公开号:US20100099886A1
公开(公告)日:2010-04-22
A process for preparing a N-phenylisoxazolidin-5-one derivative is provided. The process for preparing the N-phenylisoxazolidin-5-one derivative comprises reacting an α,β-unsaturated aldehyde with nitrosobenzene in the presence of a N-heterocyclic carbene (NHC) catalyst. A process for preparing an N-alkoxyphenyl protected β-amino acid ester derivative is further provided. The process for preparing the N-alkoxyphenyl protected β-amino acid ester derivative comprises reacting an α,β-unsaturated aldehyde with nitrosobenzene in the presence of a N-heterocyclic carbene (NHC) catalyst to form a N-phenylisoxazolidin-5-one derivative, and then treating the N-phenylisoxazolidin-5-one derivative with an alcohol in the presence of an acid catalyst. A process for preparing an N-alkoxyphenyl protected β-amino acid ester derivative, comprising treating a N-phenylisoxazolidin-5-one derivative with an alcohol in the presence of an acid catalyst, is also provided.
提供一种制备N-苯基异噁唑烷-5-酮衍生物的方法。制备N-苯基异噁唑烷-5-酮衍生物的方法包括在N-杂环卡宾(NHC)催化剂的存在下,将α,β-不饱和醛与亚硝基苯反应。进一步提供一种制备N-烷氧基苯基保护的β-氨基酸酯衍生物的方法。制备N-烷氧基苯基保护的β-氨基酸酯衍生物的方法包括在N-杂环卡宾(NHC)催化剂的存在下,将α,β-不饱和醛与亚硝基苯反应以形成N-苯基异噁唑烷-5-酮衍生物,然后在酸催化剂的存在下用醇处理N-苯基异噁唑烷-5-酮衍生物。还提供了一种制备N-烷氧基苯基保护的β-氨基酸酯衍生物的方法,包括在酸催化剂的存在下用醇处理N-苯基异噁唑烷-5-酮衍生物。