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
Transition-Metal-Free Synthesis of<i>N</i>-(1-Alkenyl)imidazoles by Potassium Phosphate-Promoted Addition Reaction of Alkynes to Imidazoles
作者:Linhua Lu、Hong Yan、Defu Liu、Guangwei Rong、Jincheng Mao
DOI:10.1002/asia.201301173
日期:2014.1
The additionreaction of alkynes to N‐heterocycles by simply heating in DMSO with potassium phosphate is reported. Good yields with high stereoselectivity could be achieved for a range of substrates. The scope is quite general for both amines and phenylacetylenes. In addition, internal alkynes and α‐bromostyrene were also examined in this reaction. This process is efficient and useful for the synthesis