Dedicated to Professor Masahiro Murakami on the occasion of his retirement
Abstract
4-Isocyanobut-1-ene reacted rapidly with acetyl bromide to afford an unstable imidoyl bromide adduct. Subsequent in situ cyclization under Heck conditions generated a stable prototropic isomer of 2-acetyl-3-methylpyrrole. The reactivity of this molecule toward acids, bases, and oxidants was explored, and its conversion into an α-methylidene γ-lactam was demonstrated. In protonated form, the molecule functioned as a reactive dienophile in Diels–Alder reactions.
Key words
isocyanides - imidoyl bromides - Heck cyclization - methylpyrrolylethanone - Diels–Alder reaction