Isolation and syn Elimination of a Peterson Adduct to Obtain Optically Pure Product in the Diastereoselective Synthesis of Oxazolidinone- Functionalized Enecarbamates
作者:Marissa Solomon、Hideaki Saito、J. Sivaguru、Steffen Jockusch、Yoshihisa Inoue、Waldemar Adam、Nicholas Turro
DOI:10.2174/157017809788681400
日期:2009.7.1
The Peterson reaction of (4R)-N-(trimethylsilyl)methyl-4-alkyloxazolidin-2-one gives (E/Z)-(4R)-N-(2,3- diphenylbut-1-enyl)-4-alkyloxazolidin-2-ones (enecarbamates) with increasing (Z)-selectivity and moderate-to-high diastereoselectivity in the individual E isomer as a function of increasing temperature. X-ray structure of the Peterson adduct, (4R,3S)-N-(2,3-diphenyl-2-hydroxy-but-1-enyl)-4-alkyloxazolidin-2-one (enecarbamates), reveals the rationale for the formation of a single isomer through syn elimination. The optically pure enecarbamates obtained with the Peterson adduct were further employed for photochemical and photophysical studies.
(4R)-N-(trimethylsilyl)methyl-4-alkyloxazolidin-2-one 的彼得森反应生成了 (E/Z)-(4R)-N-(2,3-二苯基-2-羟基-1-丁烯基)-4-烷基恶唑啉-2-酮(烯碳酰胺),随着温度的升高,(Z)-选择性不断增加,单个 E 异构体的非对映选择性从中等到较高不等。Peterson 加合物 (4R,3S)-N-(2,3-二苯基-2-羟基-丁-1-烯基)-4-烷基恶唑烷-2-酮(enecarbamates)的 X 射线结构揭示了通过合成消除形成单一异构体的原理。利用彼得森加合物获得的光学纯净的烯碳酸盐被进一步用于光化学和光物理研究。