An efficient and general protocol is described for the Michaeladdition of α,β-unsaturated ketones with electron-rich arenes/indoles to give alkylated arenes/indoles under mild reaction condition at room temperature. Shorter reaction time, convenient and good isolated yields are the significant features of this protocol. Moreover, the procedure is environmentally benign in nature and applicable to
Hafnium trifluoromethanesulfonate [Hf(OTf)4]- and scandium trifluoromethanesulfonate [Sc(OTf)3]-catalyzed conjugated addition of 3-position of indoles to several enones proceeded in acetonitrile as solvent. Especially, Hf(OTf)4 exhibited high catalytic activity and gave the conjugate addition product in good yield.
Iodine-catalyzed highly efficient Michael reaction of indoles under solvent-free condition
作者:Bimal K. Banik、Miguel Fernandez、Clarissa Alvarez
DOI:10.1016/j.tetlet.2005.02.044
日期:2005.4
Michael reaction of indoles with unsaturated ketones has been accomplished in the presence of catalytic amount of iodine under solvent-free condition. (c) 2005 Published by Elsevier Ltd.
Bismuth Nitrate-Catalyzed Michael Reactions of Indoles in Water
作者:Bimal K. Banik、Isabella Garcia、Frances R. Morales