作者:Gerald Pattenden、Stephen M. Thom、Martin F. Jones
DOI:10.1016/s0040-4020(01)86313-4
日期:1993.3
Treatment of the N-formyl derivative of the thiazolidine adduct derived from (R-cysteine methyl ester hydrochloride and pivalaldehyde, with LDA-DMPU at −90°C, followed by reaction with iodomethane produces the corresponding methylated thiazolidine containing the methyl and t-butyl groups virtually exclusively anti- to one another. Hydrolysis in the presence of 5M HCl then affords (R-2-methylcysteine
在-90°C下用LDA-DMPU处理衍生自(R-半胱氨酸甲酯盐酸盐和新戊醛的噻唑烷加合物的N-甲酰基衍生物),然后与碘甲烷反应,生成相应的甲基化的噻唑烷,其中含有甲基和叔丁基基团实际上仅抗- 。在5M HCl存在下,然后得到(彼此水解- [R。-2-甲基半胱氨酸盐酸盐的优良率和对映体纯度优异的光学纯度的其它2-烷基取代的半胱氨酸的范围是由本变形例中制备的Seebach的“手性的自我复制”协议。