Drevs and Holm had originally described elaborate and time-consuming multistep synthesis procedures that we found to be avoidable by a direct transpyrrolylation approach employing 1 and the respective protonated pyrrole derivate in Et2O under mild refluxing conditions for several hours. This preparation method allowed to isolate the crude products nearly quantitatively with subsequent crystallization (8) or sublimation (9) giving the purified title compounds in yields of ~ 75 % -80 % as brown-red to red solids (Scheme 4).