Microwave-assisted palladium-catalysed isonitrile insertion in 2-bromophenylureas for efficient synthesis of 4-substituted imino 4H-benzo[d][1,3]oxazin-2-amines†
Abstract
A general route to the synthesis of 4-substituted imino 4H-benzo[d][1,3]oxazin-2-amines via palladium-catalysed isonitrile insertion in 2-bromophenylureas succeeded by a C–O cross-coupling of the intermediate imidoylpalladium species under microwave irradiation is reported.