Base-catalyzed stereoselective intermolecular addition of imidazoles onto alkynes: an easy access to imidazolyl enamines
作者:Monika Patel、Rakesh K. Saunthawal、Akhilesh K. Verma
DOI:10.1016/j.tetlet.2013.12.100
日期:2014.2
An efficient transition metal-free approach for the regio- and stereoselective addition of imidazoles 1a–f onto alkynes 2a–l to provide the Z- and E isomers of imidazolyl enamines 3a–q and 4a–d using catalytic amount of KOH is described. Stereoselectivity of the addition products (Z and E isomer) was found to be dependent upon time. Competitive experiments show that imidazole is less reactive than