Carbon dioxide-mediated new reaction of 2,5-hexanedione and primary amino compounds in water-THF produced N-substituted pyrroles in excellent yield. This method for the preparation of pyrroles is novel, simple, and efficient.
Yadav, R. N., & Banik, B. K. (2017). CARBON DIOXIDE-MEDIATED PREPARATION OF PYRROLES IN WATER FOLLOWING PAAL KNORR METHOD. Heterocyclic Letters, 7(3), 893–894.