Synthesis of naucléfine, angustidine, angustine, (±)-13b,14-dihydro-angustine and naulafine
作者:David B. Repke、Jahangir、Robin D. Clark、Janis T. Nelson、David B. MacLean
DOI:10.1016/s0040-4020(01)80085-5
日期:1989.1
The lithio derivatives of 3-cyano-4-methylpyridines and 6,7-dihydro-5H-2-pyrindine-4-carbonitrile react with 2,9-bis-(trimethylsilyl)-3,4-dihydropyrido[3,4-b]indolium trifluoromethanesulfonate to form cyclic amidines which, upon hydrolysis and oxidation, produce the title alkaloids.
A Convenient Late-Stage Fluorination of Pyridylic C−H Bonds with <i>N</i>
-Fluorobenzenesulfonimide
作者:Michael Meanwell、Matthew B. Nodwell、Rainer E. Martin、Robert Britton
DOI:10.1002/anie.201606323
日期:2016.10.10
Pyridine features prominently in pharmaceuticals and drug leads, and methods to selectively manipulate pyridine basicity or metabolic stability are highly sought after. A robust, metal‐free direct fluorination of unactivated pyridylic C−H bonds was developed. This convenient reaction shows high functional‐group tolerance and offers complimentary selectivity to existing C−H fluorination strategies.