Reformatsky reactions with N-arylpyrrolidine-2-thiones: synthesis of tricyclic analogues of quinolone antibacterial agents
作者:Joseph P Michael、Charles B de Koning、Gladys D Hosken、Trevor V Stanbury
DOI:10.1016/s0040-4020(01)00964-4
日期:2001.11
Abstract A convenientsynthesis of 5-oxo-1,2,3,5-tetrahydropyrrolo[1,2- a ]quinoline-4-carboxylic acids, tricyclic analogues of the quinolone antibiotics, is described. Key steps in the route are a novel zinc-mediated Reformatsky reaction between diethyl bromomalonate and N -arylpyrrolidine-2-thiones 18 , and cyclisation of the resulting diethyl pyrrolidinylidenemalonate intermediates 19 in polyphosphoric