Diastereoselective Synthesis of Cularine Alkaloids via Enium Ions and an Easy Entry to Isoquinolines by Aza-Wittig Electrocyclic Ring Closure
作者:J. Augusto R. Rodrigues、Rudolph A. Abramovitch、Joana D. F. de Sousa、Genaro C. Leiva
DOI:10.1021/jo030287t
日期:2004.4.1
In preliminary communications, we reported the diastereoselective synthesis of cularine and sarcocapnine via the intramolecular ring closure of nitrenium and oxenium ions, a new highly diastereoselective reductive methylation with (+)-8-phenylmenthyl chloroacetate followed by reduction with sodium borohydride, and a facile entry to the isoquinoline precursors by aza-Wittig electrocyclic ring closure
在初步的交流中,我们报道了氮和氧离子的分子内环闭合,新的非对映选择性高还原性甲基化与(+)-8-苯基薄荷基氯乙酸盐的非对映选择性合成,而硼氢化钠的还原很容易,并且容易进入氮杂-维蒂希环闭环合成异喹啉前体。我们现在报告(+)- O-去甲基萘,(+)-酞胺,(+)-sarcocapnidine,(+)-sarcocapnine和(+)-crassifoline的合成详细信息,并描述其合成的不同方法前体。