作者:Kee-Jung Lee、Wan Pyo Hong
DOI:10.1055/s-2006-926360
日期:——
Treatment of methyl propiolate and 2,4,5-trifluoro-, 2-fluoro-, 2-fluoro-5-methoxy- or 2,3,4,5-tetrafluorobenzaldehydes with a ZrCl4/Bu4NI combination induces an aldol reaction to furnish β-iodo-α-(hydroxyalkyl)acrylates. These can be used for the preparation of several quinolone intermediates, 1-substituted 4-oxo-1,4-dihydroquinoline-3-carboxylic acids and 9,10-difluoro-3-methyl-2,3-dihydro-7-oxo-7H-pyrido[1,2,3-de][1,4]benzoxazine-6-carboxylic acid through the oxidation, amination and hydrolysis reactions.
使用ZrCl4/Bu4NI组合处理甲基丙炔酸和2,4,5-三氟-、2-氟-、2-氟-5-甲氧基-或2,3,4,5-四氟苯甲醛,会引发醛醇反应,生成β-碘-α-(羟基烷基)丙烯酸酯。这些化合物可用于制备多种喹诺酮中间体、1-取代的4-氧代-1,4-二氢喹啉-3-羧酸以及9,10-二氟-3-甲基-2,3-二氢-7-氧代-7H-吡啶并[1,2,3-de][1,4]苯并噁嗪-6-羧酸,通过氧化、胺化和水解反应实现。