1,7-Addition of enamines to 1,1-bisethoxycarbonyl-2-vinylcyclopropane: a useful method of introducing a six carbon fragment α to a ketone
Abstract
The pyrrolidine enamines of cyclopentanone and cyclohexanone, in contrast to other nucleophiles, undergo exclusive 1,7-addition with 1,1-bisethoxycar-bonyl-2-vinylcyclopropane.