Asymmetric synthesis of α,α-disubstituted amino acids by diastereoselective functionalization of enantiopure phenyloxazinones, derivatives of asymmetric Strecker reaction products of aldehydes
作者:Ke Ding、Dawei Ma
DOI:10.1016/s0040-4020(01)00502-6
日期:2001.7
Esterification of the asymmetric Strecker reaction products of a suitable aldehyde and (R)-phenylglycinol followed by lactonization and alkylation provides chiral oxazinones 5. Treatment of the enolates of 5 with active alkyl halides, or aldehydes provided the corresponding functionalization products with high diastereoselectivity. The configuration of newly created quaternary carbon is S for the products
合适的醛和(R)-苯基甘氨醇的不对称Strecker反应产物的酯化反应,然后进行内酯化和烷基化反应,得到手性恶嗪酮5。用活性烷基卤化物或醛处理5的烯醇化物提供了具有高非对映选择性的相应官能化产物。新生成的季碳的构型为:与简单烷基卤化物和醛偶联的产物为S,与溴代乙酸甲酯偶联的产物为R。这些产物的脱保护得到相应的对映体纯的α,α-二烷基氨基酸。