Synthesis of cyclopropanes via organoiron methodology: preparation and rearrangement of divinylcyclopropanes.
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.
Wallock
Nathaniel J
NJ
Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, USA.
Donaldson
William A
WA