Reactions of some 2H-Chromenes and 2H-Thiochromenes with triazolinediones
作者:Christopher D. Gabbutt、John D. Hepworth、B. Mark Heron
DOI:10.1016/0040-4020(95)00874-8
日期:1995.11
Simple 2H-chromenes and 2H-thiochromenes form the [2+2]-adducts, tetrahydro[1]benzo(thio)pyrano[3,4-c] [1,2]diazeto[1,2-a][1,2,4]triazoles, with triazolinediones, whereas their 3- and 4-bromo and the corresponding cycloalkylamino derivatives undergo an overall etectrophilic substitution sequence.