Recent advances in Pauson-Khand methodology' have dramatically increased the synthetic applicability of the cyclization. Little attention, however, has been focused on Pauson-Khand reactions of electron-deficient alkynes or alkenes. There are no reported examples of successful Pauson-Khand reactions using electron-deficient alkynes? and, until recently, only dienes3 were obtained in the re- action of electron-deficient alkenes: Recent accounta of mild, amine ...
