Unexpected Formation of Optically Active 4-Substituted 5-Hydroxy-γ-lactams by Organocatalyzed Reaction of 3-Substituted Cyclobutanones with Nitrosobenzene
作者:Angelo Frongia、Pier Piras、Francesca Capitta、Jean Ollivier、Francesco Secci
DOI:10.1055/s-0030-1259084
日期:2011.1
An organocatalyzed enantioselective desymmetrization reaction for converting 3-substituted cyclobutanones into 4-substituted 5-hydroxy-γ-lactams is presented. This involves a ring-expanding O-nitroso aldol-cyclization domino sequence. This synthetic protocol provides access to five-membered ring systems in good yields with the generation of two new stereogenic centers.
本文介绍了一种有机催化的对映选择性去对称化反应,用于将3-取代的环丁酮转化为4-取代的5-羟基-γ-内酯。这涉及一个环扩展的O-亚硝基醛醇环化多米诺序列。该合成方法能够在良好的产率下获取五元环系统,并生成两个新的立体中心。