Patent ID: 7442804

Claim:
A process for the preparation of furopyrroles of the general formula comprising (a) microwave irradiation of a compound of the formula optionally in the presence of an inert solvent, wherein A 1 and A 2 are C 1 -C 18 alkyl, C 2 -C 18 alkenyl, C 2 -C 18 alkynyl, C 5 -C 8 cycloalkyl, C 5 -C 8 cycloalkenyl, aryl or heteroaryl, A 3 is hydrogen, C 1 -C 18 alkyl, cyanomethyl, A 3 , —CR 30 R 31 —(CH 2 ) m —A 3 or Y—R 32 , wherein R 30 and R 31 independently of each other stand for hydrogen or C 1 -C 4 alkyl, or phenyl which can be substituted up to three times with C 1 -C 4 alkyl, Ar 3 stands for aryl, C 5 -C 8 cycloalkyl, C 5 -C 8 cycloalkenyl or heteroaryl, which can be substituted one to three times with C 1 -C 8 alkyl, C 1 -C 8 alkoxy, halogen or phenyl, which can be substituted with C 1 -C 8 alkyl or C 1 -C 8 alkoxy one to three times, and m stands for 0, 1, 2, 3 or 4, R is C 1 -C 18 alkyl, aryl, or aralkyl, in which can be substituted one to three times with C 1 -C 8 alkyl, C 1 -C 8 alkoxy, or halogen, Y is —C(O)—, —C(O)O—, —C(O)NH—, —SO 2 NH— or —SO 2 — and R 32 is C 1 -C 18 alkyl, Ar 3 , or aralkyl.