Conjugate addition reactions of α-azoalkylcuprate reagents
作者:Christopher W. Alexander、Shou-Yuan Lin、R. Karl Dieter
DOI:10.1016/0022-328x(95)05562-4
日期:1995.11
A newclass of α-heteroatomalkyl organocuprate/organocopper reagents has been prepared. These α-azoalkyl cupratereagents were derived from α-azoalkyl anions and were treated with enones and enoates affording γ-azoalkyl carbonyl compounds in modest yields.
A new asymmetric activation strategy for hydrazones as acyl anion equivalents in the bimetallic catalyzed carbonyl-ene reaction
作者:Wen-Bo Hu、Xixi Song、Min-Can Wang
DOI:10.1039/d1ob00017a
日期:——
A new asymmetricactivation strategy for hydrazones as acyl anion equivalents is developed in the bimetallic catalyzed carbonyl-ene reaction of isatins and hydrazones. Under mild conditions, optically active functionalized 3-hydroxy-2-oxindoles were furnished in up to 98% yield with up to 97% enantioselectivity. In this process, formaldehyde tert-butylhydrazone which is seldom employed in asymmetric