Synthesis of cyclopropanes via organoiron methodology: Preparation and rearrangement of divinylcyclopropanes - Studies directed toward the synthesis of hydroazulenes

摘要

Addition of alkenyl Grignard reagents to (1-methoxycarbonylpentadienyl)iron(1(+)) cation generates the corresponding (2-alkenylpent-3-en-1,5-diyl)iron complexes. Oxidatively induced reductive elimination of these complexes gives divinylcyclopropanes which can undergo subsequent Cope rearrangement to give 1,4-cycloheptadienes.