Selenomethylpyrroles: their use for synthesis of dipyrrylmethanes (dipyrrins), tripyranes and bilanes
Abstract
Phenylselenomethylpyrroles react rapidly under mild conditions with α-free pyrroles in the presence of copper(I) triflate to form pyrrole–CH2–pyrrole systems in preparative yields. The same coupling reaction can also be achieved thermally or photochemically but these approaches are limited in scope and, save for special cases, do not compete with the procedure based on copper(I).