Macrocyclization through radical-mediated vinylcyclopropane/alkene condensation. Facile entry into the brefeldin ring system
摘要:
Bicyclic products featuring an 11-membered ring fused to a core vinylcyclopentane unit are produced upon treatment of functionalized vinylcyclopropanes bearing an omega-alkene unit with a catalytic amount of phenylthio radical. This intramolecular extension of a radical-mediated vinylcyclopropane/alkene cyclocondensation proceeds with only modest diastereoselectivity. The reaction products resemble members of the brefeldin family of naturally occurring antibiotics.