N-hydroxypyridine-2-thione carbamates. v. syntheses of alkaloid skeletons by aminium cation radical cyclizations
作者:Martin Newcomb、Donald J. Marquardt、Thomas M. Deeb
DOI:10.1016/s0040-4020(01)82013-5
日期:1990.1
The title radical precursors (PTOC carbamates) were employed as sources of a variety of 5,6-unsaturated aminium cation radicals. 5-Exo radical cyclization followed by trapping by t-BuSH or the PTOC carbamate gave a variety of aklaloid skeletons, typically in good to excellent yields, including pyrrolidines, perhydroindoles, pyrrolizidines, tropanes, 9-azabicyclo[4.2.1]nonanes, 6-azabicyclo [3.2.1]octanes
标题自由基前体(PTOC氨基甲酸酯)用作各种5,6-不饱和铵阳离子自由基的来源。5-外切自由基环化,接着通过捕集吨-BuSH或PTOC氨基甲酸酯给各种aklaloid骨架,典型地以良好至优异的产率,包括吡咯烷,perhydroindoles,吡咯烷并,莨菪烷,9-氮杂双环[4.2.1]壬烷,6 -氮杂双环[3.2.1]辛烷。6-外切和7-内的环化反应竞争的6,7-不饱和系统