Manganese (III) acetate mediated synthesis of polysubstituted pyrroles under solvent-free ball milling
作者:Ji-Chao Zeng、Hui Xu、Fei Yu、Ze Zhang
DOI:10.1016/j.tetlet.2017.01.016
日期:2017.2
Under solvent-freeballmilling conditions, a simple and mild method was developed for efficient synthesis of 2,5-dimethyl-3,4-dicarboxylate-pyrroles and N-substituted 3,4-diphenylpyrroles via condensation-annulation of amines with acetoacetate and 2-phenylacetaldehyde, respectively. The use of cheap and safe Mn(OAc)3 as a mediator, no use of commonly employed acetic acid as solvent, short reaction
Zinc tetrafluoroborate-catalysed synthesis of highly substituted pyrroles by a solvent-free reaction
作者:Brindaban C. Ranu、Sudip Ghosh、Arijit Das
DOI:10.1070/mc2006v016n04abeh002287
日期:2006.1
A simple and highly efficient synthesis of penta- and tri-substituted pyrroles has been developed using the Paal-Knorr reaction catalysed by aqueous zinc tetrafluoroborate at room temperature under solvent-free conditions.
Knorr, Chemische Berichte, 1885, vol. 18, p. 306,307