Tetrahedron p. 13277 - 13290 (1995)
Update date:2022-09-26
Topics:
Gabbutt, Christopher D.
Hepworth, John D.
Mark Heron
Simple 2H-chromenes and 2H-thiochromenes form the [2+2]-adducts, tetrahydrol[1]benzo(thio)pyrano[3,4-c][1,2]diazeto[1,2-a][1,2,4]-triaz oles, with triazolinediones, whereas their 3- and 4-bromo and the corresponding cycloalkylamino derivatives undergo an overall electrophilic substitution sequence.
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