作者:Dieter Enders、Alexander Moll、Annette Schaadt、Gerhard Raabe、Jan Runsink
DOI:10.1002/ejoc.200300249
日期:2003.10
An efficient and flexible asymmetric synthesis of various protected anti-1,2-sulfanyl amines bearing two adjacent stereogenic centres is described. Key steps are the diastereoselective α-alkylation of α-sulfanylated acetaldehyde-SAMP-hydrazones with various electrophiles and subsequent nucleophilic 1,2-addition of organocerium reagents to the hydrazone CN double bond. The resulting hydrazines were
描述了带有两个相邻立体中心的各种受保护的抗 1,2-硫烷基胺的有效和灵活的不对称合成。关键步骤是使用各种亲电子试剂对 α-硫烷基化乙醛-SAMP-腙进行非对映选择性 α-烷基化,随后将有机铈试剂亲核 1,2-加成到腙CN 双键上。通过还原性 N,N 键断裂去除手性助剂和保护氨基官能团,将所得肼转化为具有优异非对映体和对映体过量(de 和 ee 值⩾ 96%)的标题化合物。相对和绝对构型由 NOE 实验和 X 射线结构分析确定。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)