X=Y-ZH Compounds as potential 1,3-dipoles. Part 30. Cycloaddition of arylidene imines of α-amino esters to acetylenic dipolarophiles and pyrrole forming rearrangements
作者:Ronald Grigg、H.Q. Nimal Gunaratne、James Kemp
DOI:10.1016/s0040-4020(01)96015-6
日期:1990.1
α-amino esters undergo cycloaddition to ethyl phenylpropiolate, methyl propiolate and dimethyl acetylenedicarboxylate (ADE) on heating in toluene (110°C)or o-xylene (135- 145°C). The reactions proceed via stereospecific azomethine ylide formation and give single 3-pyrroline cycloadducts in moderate to good yield. Reaction of certain of the imines with 2 mol. of ADE leads to a pyrroles formed by rearrangement