2-oxo-3-butenoate esters as dienophiles and their utility in a novel synthesis of pyrroles
摘要:
Trisubstituted pyrroles of type 8 have been prepared in a regiospecific fashion by a two step sequence involving Diels-Alder reaction of 2-oxo-3-butenoate esters 1 with 2-alkoxy-1,3-pentiadiene derivatives 13, followed by ozonolysis and Paal-Knorr cyclization.