1-Methoxycarbonylpyrrolizin-3-one and related compounds
作者:Xavier L. M. Despinoy、Hamish McNab
DOI:10.1039/b901961h
日期:——
Flash vacuum pyrolysis (FVP) of dimethyl E- or Z-pyrrol-2-ylbut-2-enedioate 5 at 700 °C gave 1-methoxycarbonylpyrrolizin-3-one 1. The sequence involves E- to Z-isomerisation (if necessary), elimination of methanol and cyclisation; the elimination step is rate determining. The pyrrolizinone 1 is stable at low temperatures, but at room temperature dimerises spontaneously across the 1,2-bond to give a