situ by dehydrohalogenation of dichloroacetyl chloride with triethylamine or zinc dehalogenation of trichloroacetyl bromide, is a reactive and unstable molecule. It reacts very readily with conjugated dienes to give exclusively derivatives of α,α dichlorocyclobutanone. No 1,4-cycloadducts were detected. Other activated olefins such as indene or dihydropyran also give good yields of cycloadducts. Electrophilic
Synthesis and Reactivity of a Stable Prototropic Isomer of 2-Acetyl-3-methylpyrrole
作者:Patrick G. Harran、Aleksandras Lotuzas、Anton El Khoury、Liubo Li
DOI:10.1055/a-1969-4095
日期:——
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.