Conjugate Addition Reactions of <i>N</i>-Carbamoyl-4-pyridones and 2,3-Dihydropyridones with Grignard Reagents in the Absence of Cu(I) Salts
作者:Fenghai Guo、Ramesh C. Dhakal、R. Karl Dieter
DOI:10.1021/jo400936z
日期:2013.9.6
4-addition reactions with Grignardreagents in the presence of chlorotrimethylsilane (TMSCl) or BF3·Et2O in excellent yields. Copper catalysis is not required, and mechanistic considerations suggest that the reaction is proceeding by a conjugate addition pathway rather than by a pathway involving 1,2-addition to an intermediate pyridinium ion. TMSCl-mediated conjugate addition of Grignardreagents to 2-substituted-2