A Highly Efficient Paal-Knorr Synthesis of Pyrroles Catalyzed by Formic Acid at Room Temperature under Solvent-Free Conditions
ZHU Xin-Hai, CHEN Gong, XU Zun-Le, WAN Yi-Qian*
Chin. J. Org. Chem. . 2008, (01): 115 -119 .