Synthesis of Tertiary Amides from Anionically Activated Aromatic Trifluoromethyl Groups
作者:Gavin O’Mahony、Andrew K. Pitts
DOI:10.1021/ol100507n
日期:2010.5.7
In this paper, a novel synthesis of tertiary amides from anionically activated aromatic trifluoromethyl groups is presented. Anionically activated trifluoromethyl groups react with secondary amines under aqueous conditions to afford tertiary amides. The mechanism involves initial elimination of hydrogen fluoride by an E1cB mechanism to afford an electrophilic quinone methide- or azafulvene-type intermediate
spiro‐cyclohexadienones from the PhI(OCOCF3)2‐mediated spiro‐cyclization of N‐substituted benzanilides, with BF3⋅Et2O initiates a tandem ring opening/closure reaction leading to the formation of the biologically interesting 8‐hydroxy‐phenanthridin‐6(5H)‐one compounds. This unique rearrangement pattern involves the ‘migration’ of the electron‐deficient N‐methyl carbamoyl moiety rather than the electron‐rich aryl group