An easy entry to isoquinoline alkaloids by aza-Wittig electrocyclic ring-closure
作者:J. Augusto R Rodrigues、Genaro C Leiva、Joana D.F de Sousa
DOI:10.1016/0040-4039(94)02211-s
日期:1995.1
The reaction of phenethyliminophosphorane with arylketenes gave 1-benzyl-3.4-dihydroisoquinolines in good yields. An aza-Wittig type reaction of vinyliminophosphorane with p-toluenesulfonylisocyanate furnished 1-aminoisoquinoline 6 in high yield.
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 diastereoselectivesynthesis of cularine and sarcocapninevia the intramolecular ring closure of nitrenium and oxenium ions, a newhighlydiastereoselectivereductivemethylation with (+)-8-phenylmenthyl chloroacetate followed by reduction with sodium borohydride, and a facile entry to the isoquinoline precursors by aza-Wittig electrocyclic ring closure