Preparation of α-amino-carboxylic acid derivatives via diastereoselective reactions of glycine enolate equivalents
作者:S Caddick、N.J Parr、M.C Pritchard
DOI:10.1016/s0040-4020(01)00552-x
日期:2001.7
imidazolidinone auxiliary undergo diastereoselective alkylation and acylation reactions in moderate to good yields (9–91%) with high levels of stereocontrol (generally >95% de). Subsequent alkylation of these derivatives has been demonstrated for the production of non-racemic α,α-disubstituted amino acid precursors. Diastereoselective aldol reactions are also found to proceed with good yields and excellent stereocontrol
摘要 与咪唑啉酮助剂结合的受保护甘氨酸类似物以中等至良好的收率 (9–91%) 进行非对映选择性烷基化和酰化反应,并具有高水平的立体控制(通常 > 95% de)。已证明这些衍生物的后续烷基化可用于生产非外消旋 α,α-二取代氨基酸前体。还发现非对映选择性羟醛反应以良好的产率和出色的立体控制(62-84%,93-95% de)进行。这些加合物的手性辅助裂解和氢解提供了 β-羟基-α-氨基酸衍生物,没有观察到光学纯度的侵蚀。