Regio- and stereoselective intramolecular Heck reactions of N-acyl-2,3-dihydro-4-pyridones
作者:Daniel L. Comins、Sajan P. Joseph、Yue-mei Zhang
DOI:10.1016/0040-4039(95)02297-x
日期:1996.2
Intramolecular Heck reactions of N-acyl-2,3-dihydro-4-pyridones provide polycyclic heterocycles with high regio- and stereoselectivity.
N-酰基-2,3-二氢-4-吡啶酮的分子内Heck反应提供具有高区域和立体选择性的多环杂环。
Highly diastereoselective formation of substituted indolizidines and quinolizidines by radical cyclization
作者:Athelstan L. J. Beckwith、Sajan P. Joseph、Roshan T. A. Mayadunne
DOI:10.1021/jo00068a009
日期:1993.7
2-Substituted 2,3-dihydro-4-pyridinones (eg., 1a) bearing an (omega-bromoacyl)-, (o-bromoaroyl)-, or (o-bromophenyl)aeetyl group on nitrogen, when treated with tributylstannane, undergo highly diastereoselective cyclization by intramolecular homolytic addition anti to the substituent at C-2; molecular mechanics calculation support the view that the diastereoselectivity arises from the nonbonded interaction between the substituent and the amide carbonyl group.
Anionic Cyclizations of Chiral 2,3-Dihydro-4-pyridones: A Five-Step, Asymmetric Synthesis of Indolizidine 209D