Stereochemical Study on α-Alkylation of β-Branched α-Amino Acid Derivatives via Memory of Chirality
作者:Takeo Kawabata、Jianyong Chen、Hideo Suzuki、Kaoru Fuji
DOI:10.1055/s-2005-865337
日期:——
N-Boc-N-MOM amino acid derivatives with an additional chiral center at the β-carbon proceeded with retention of configuration, irrespective of the chirality at the P-carbon. The C-N axial chirality of the enolate intermediates played a decisive role in the stereochemical course of the alkylation, while the central chirality of the β-carbon had little effect. Amino acid derivatives with contiguous quaternary
N-Boc-N-MOM 氨基酸衍生物在 β-碳上具有额外的手性中心的 α-烷基化继续进行构型保留,而与 P-碳的手性无关。烯醇化物中间体的CN轴向手性在烷基化的立体化学过程中起决定性作用,而β-碳的中心手性影响不大。具有连续的四级和三级立体中心的氨基酸衍生物很容易以立体化学预期的方式获得。