Synthesis of fully-substituted alkenylimidazoles from N-(cyanoalkyl)amides via the In-mediated allylation of nitrile and dehydrative cyclization cascade
作者:Yu Mi Kim、Sangku Lee、Sung Hwan Kim、Ko Hoon Kim、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2010.09.016
日期:2010.11
The reaction of allylindium reagents and N-(cyanoalkyl)amides afforded fully-substituted 4-alkenylimidazoles in moderate yields via the In-mediated Barbier-type allylation of nitrile and the following dehydrative cyclization cascade.
The reaction of the hydrofluoroborate salt of an open-chain analogue of a Reissertcompound with some α,β-ethylenic esters does not give a [4 + 2] cycloadduct, as previously described in the case of ethyl acrylate. The reaction starts with a 1,3-dipolar cycloaddition of a munchnone imine 5c, d. The [3 + 2] cycloadducts 13 evolve via a rearrangement–condensation sequence to give a substituted 2-pyridone