A New Entry to Polyfunctionalized4,5-<i>trans</i>Disubstituted Oxazolidin-2-ones from<scp>l</scp>-Aspartic Acid
作者:Claudia Tomasini、Gianluigi Luppi
DOI:10.1055/s-2003-38733
日期:——
A straightforward synthesis of enantiomerically pure (4R,5S)-5-oxazolidinecarboxylic acid, 2-oxo-4-[(t-butyldimethylsilyloxy)methyl]-, benzyl ester and of (4S,5S)-4-oxazolidinecarboxylic acid, 2-oxo-5-[(t-butyldimethylsilyloxy)methyl]-, benzyl ester was envisaged starting from readily available l-aspartic acid. The key step is the diastereoselective addition of iodine with the introduction of a new stereogenic centre.
一种简单的合成方法被设想用于手性纯(4R,5S)-5-氧杂植物酸、2-氧-4-[(t-丁基二甲基硅氧基)甲基]-苄酯和(4S,5S)-4-氧杂植物酸、2-氧-5-[(t-丁基二甲基硅氧基)甲基]-苄酯,起始材料为容易获得的L-天冬氨酸。关键步骤是碘的二源选择性加成,伴随引入一个新的立体中心。