conditions was accompanied by hydrolysis of the fluorovinyl moiety to give (R)-(−)-2-amino-4-oxopentanoic acid hydrochloride with 28% overall yield and >95% ee. Ab initio calculations of acetamide and 2-fluoropropene as models for a primary amide or a fluorovinyl group despite of their different electronic structure show a similar electrostatic potential on the van der Waals surface suggesting their isosteric
水解脱保护后,用3-溴-
2-氟丙烯将(R)-(+)-
樟脑基甘
氨酸或丙
氨酸酯
亚胺进行非对映选择性烷基化,得到(R)-(+)-2-
氨基-4-
氟戊-4-烯酸总产率为38%,ee为90%,或(R)-(+)-2-
氨基-4-
氟-2-甲基戊-4-烯酸(总产率为19%,ee为59%)。在剧烈条件下的脱保护伴随有
氟乙烯基部分的
水解,以总收率28%和ee> 95%得到(R)-(-)-2-
氨基-4-氧
戊烷酸盐酸盐。从头算 尽管乙酰胺和
2-氟丙烯具有不同的电子结构,但对乙酰胺和
2-氟丙烯的计算却显示出范德华表面具有相似的静电势,这表明它们具有等规性。