Organotelluriums. Part 21. Amidotellurinylation of olefins and a novel one-pot synthesis of 4,5-dihydro-oxazoles from olefins

Abstract

Benezenetellurinyl trifluoroacetate in the presence of boron trifluoride–diethyl ether effects ready amidotellurinylation of olefins in acetonitrile at room temperature. The resulting β-acetamidoalkyl phenyl telluroxides further suffer an in situ intramolecular substitution at 75 °C to give 4,5-dihydrooxazoles in high yields. These reactions are highly regio- and stereo-selective.