Synthesis of Pyrrolizidine Derivatives by 1,3-Dipolar Cycloaddition Reactions of Chiral Five-Membered Cyclic Azomethine Ylides
作者:Nikolaos G. Argyropoulos、Vasiliki C. Sarli、Maria Gdaniec
DOI:10.1002/ejoc.200600207
日期:2006.8
The 1,3-dipolar cycloaddition reactions of chiral five-membered cyclic azomethine ylides, generated in situ from ethyl glyoxylate and protected (3S,4S)-dihydroxypyrrolidines 3 and 6 have been studied. The facial selectivity of the cycloaddition reaction is governed by the steric effect of the substituent on the pyrrolidine ring next to the azomethine ylide functionality, leading in all cases to an
已经研究了手性五元环状偶氮甲碱叶立德的 1,3-偶极环加成反应,由乙醛酸乙酯和受保护的 (3S,4S)-二羟基吡咯烷 3 和 6 原位生成。环加成反应的面选择性受偶氮甲碱叶立德官能团旁边的吡咯烷环上取代基的空间效应控制,在所有情况下都导致偶极体的独家 Si 面方法。外/内选择性取决于亲偶极体和吡咯烷环上其他取代基的大小。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)