作者:Dieter Enders、Jan H. Kirchhoff
DOI:10.1055/s-2000-8733
日期:——
The asymmetric synthesis of (+)-2-epi-deoxoprosopinine [(S,S,R)-5] in eleven steps and with excellent diastereomeric and enantiomeric purity (de, ee ≥96%) is described. As key steps, the 1,2-addition of a dodecyl nucleophile to an aldehyde-SAMP hydrazone and the α-alkylation of 2,2-dimethyl-1,3-dioxan-5-one SAMP hydrazone are employed to generate two of the three stereogenic centers. Creation of the third stereogenic center was achieved in a domino deprotection/cyclisation/reduction sequence.
描述了 (+)-2-表-脱氧前罗匹宁 [(S,S,R)-5] 的不对称合成,共 11 个步骤,具有优异的非对映体和对映体纯度 (de, ee ≥96%)。作为关键步骤,十二烷基亲核试剂与醛-SAMP 腙的 1,2-加成和 2,2-二甲基-1,3-二恶烷-5-一 SAMP 腙的 α-烷基化被用来生成两种三个立体中心。第三立体中心的创建是通过多米诺骨牌去保护/环化/还原序列实现的。