Enantioselective synthesis of unsaturated amino acids using p-methoxybenzylamine as an ammonia equivalent
作者:Montserrat Alcón、Albert Moyano、Miquel A Pericàs、Antoni Riera
DOI:10.1016/s0957-4166(99)00525-x
日期:1999.12
A versatile, non-alkylative enantioselective synthesis of unsaturated α-amino acids based on the Sharpless asymmetric epoxidation has been developed. Enantiomerically enriched trans epoxy alcohols bearing unsaturated substituents were prepared and submitted to regio- and stereospecific ring-opening with p-methoxybenzylamine as a nucleophile, leading to anti-3-(p-methoxybenzylamino)-1,2-diols which
已开发了一种基于Sharpless不对称环氧化的通用,不饱和的α-氨基酸的非烷基化对映体选择性合成方法。制备带有不饱和取代基的对映体富集的反式环氧醇,并用对甲氧基苄胺作为亲核试剂进行区域和立体特异性开环,得到抗-3-(对甲氧基苄基氨基)-1,2-二醇,并进一步受到保护。用Boc反应2 O. 1,2-二醇片段然后通过氧化一个顺序处理裂解用高碘酸钠和亚氯酸钠,得到相应的氨基酸。使用这种方法,双重受N保护(p-甲氧基苄基和Boc)烯丙基甘氨酸,3-丁烯基甘氨酸和4-戊烯基甘氨酸已经通过三个合成步骤由相应的烯丙醇制备。为了证明氮保护的正交性质,已经从完全保护的氨基酯中选择性地除去了两个保护基。