i-propyl 6-methyl-1,2-dihydro-3H-pyrrolo<1,2-a>-1-carboxylate 、
N,N-二甲基噻吩-2-甲酰胺 以to produce isopropyl 5-(2-thenoyl)-1,2-dihydro-6-methyl-3H-pyrrolo[1,2-a]pyrrole-1-carboxylate (XI, R = CH3, R1 = H, R2 = iC3H7, X = S)的产率得到isopropyl 5-(2-thenoyl)-1,2-dihydro-6-methyl-3H-pyrrolo[1,2-a]pyrrole-1-carboxylate