Formation of carbazoles by photolytic extrusion of dimethyl phenylphosphonate from oxazaphosphoranes. A phosphorus analogue of the Graebe–Ullmann reaction
Abstract
A phosphorus analogue of the Graebe–Ullmann reaction is described in which the carbazoles (4) are formed by photolytic extrusion of PhP(O)(OMe)2 from the oxazaphosphoranes (1); this provides a two-step, complete deoxygenation of the readily available ethers (2) to the carbazoles.