Stereoselective synthesis of cyclopropyl indolyl ketones with indolylidene and arsonium ylide

An efficient approach for stereoselective synthesis of cyclopropyl indolyl ketone from olefin and arsonium ylied was achieved. Its advantages are of mild condition, high yield, and good stereoselectivity. In addition, the one-pot cycloproparation of olefins with bromides and triphenylarsine was studied.