Synthesis of (R)- and (S)-2,3-methanovaline from (2S)-N-benzoyl-2-tert-butyl-4-methylene-1,3-oxazolidin-5-one
作者:Rafael Chinchilla、Carmen Nájera、Santiago García-Granda、Amador Menéndez-Velázquez
DOI:10.1016/s0040-4039(00)73864-0
日期:1993.9
The reaction of (2S)-N-benzoyl-2-tert-butyl-4-methylene-1,3-oxazolidin-5-one (9) with isopropylidene-triphenylphosphorane at room temperature gives the corresponding cis and trans spirocyclopropane derivatives 10 in ca. 1:1 ratio. After separation of both diastereomers, by recrystallization and flash chromatography, and further acid hydrolysis, enantiomerically pure (R)- and (S)-2,3-methanovaline 11
(2S)-N-苯甲酰基-2-叔丁基-4-亚甲基-1,3-恶唑烷基-5-酮(9)在室温下与异亚丙基-三苯基磷烷反应生成相应的顺式和反式螺环丙烷衍生物10在约。1:1的比例。分离两种非对映异构体之后,通过重结晶和快速色谱法,以及进一步的酸水解,获得对映体纯的(R)-和(S)-2,3-美甲新碱11。