Direct C–H Allylation of <i>N</i>-Acyl/Sulfonyl Tetrahydroisoquinolines and Analogues
作者:Changcun Yan、Yuxiu Liu、Qingmin Wang
DOI:10.1021/acs.orglett.5b03042
日期:2015.11.20
A highly efficient direct C–H allylation reaction at the α position of N-acyl/sulfonyl tetrahydroisoquinolines under mild conditions was developed. The reaction was also suitable for allylation of other protected nitrogen-containing heterocycles. Several interesting transformations of the products into valuable synthetic intermediates are featured with the successful total synthesis of (±)-crispine
Complexation Promoted Additions to <i>N</i>-Benzoyliminopyridinium Ylides. A Novel and Highly Regioselective Approach to Polysubstituted Piperidines
作者:Claude Legault、André B. Charette
DOI:10.1021/ja0348647
日期:2003.5.1
Unprecedented regioselectivities were observed for the addition of different organometallic nucleophiles to N-benzoyliminopyridinium ylides. Even benzylic and branched aliphatic Grignard reagents, which usually give substantial amounts of 1,4-adducts, showed excellent 1,2-regioselectivities. The electronic nature of the pyridinium ylide is taken into account to explain these results.