An Improved Synthesis of Optically Pure 4-Boc-5,6-Diphenylmorpholin-2-one and 4-Cbz-5,6-Diphenylmorpholin-2-one
作者:Robert M. Williams、Kim A. Dastlik、Uta Sundermeier、Deidre M. Johns、Yuyin Chen
DOI:10.1055/s-2005-863740
日期:——
A convenient synthesis of optically pure 4-Boc-5,6-diphenylmorpholin-2-one and 4-Cbz-5,6-diphenylmorpholin-2-one by reaction of (+)- or (-)-2-amino-1,2-diphenylethanol with ethyl bromoacetate, followed by N-protection, and p-TsOH-mediated ring-closure is described. The title compounds can be used as synthons for the asymmetric synthesis of N-protected α-amino acids. These lactones are quite stable
通过 (+)- 或 (-)-2-amino-1 反应方便合成光学纯 4-Boc-5,6-diphenylmorpholin-2-one 和 4-Cbz-5,6-diphenylmorpholin-2-one , 2-二苯基乙醇与溴乙酸乙酯, 然后是 N-保护, 和 p-TsOH 介导的闭环。标题化合物可用作合成子,用于 N-保护的 α-氨基酸的不对称合成。这些内酯对于储存和处理非常稳定。