“One pot” regiospecific synthesis of polysubstituted pyrroles from benzylamines and ynones under metal free conditions
作者:Jinhai Shen、Guolin Cheng、Xiuling Cui
DOI:10.1039/c3cc43844a
日期:——
A convenient âone-potâ weak base-promoted synthesis of polysubstituted pyrroles has been developed from benzylamines and ynones. This transformation involves the Michael addition reaction and intramolecular condensation, which features high regioselectivity, high efficiency, environmental friendliness and metal free. A series of polysubstituted pyrroles were provided in up to 91% yield for 27 examples.
A base‐promoted oxidativedearomatization of substituted pyrroles for the synthesis of 3,3‐disubstituted 4‐pyrrolin‐2‐ones under mild reaction conditions is described. A cascade aerobic oxidation/semipinacolrearrangement reaction was involved, and the desired products bearing a quaternary carbon center were efficiently prepared using molecular oxygen (O2) as an ideal oxidant.