Synthesis of 2,3-Dihydro-4(1H)-quinolones and the Corresponding 4(1H)-Quinolones via Low-Temperature Fries Rearrangement of N-Arylazetidin-2-ones
作者:Jens Lange、Alex C. Bissember、Martin G. Banwell、Ian A. Cade
DOI:10.1071/ch10465
日期:——
cyclization processes, undergo smooth Fries-rearrangement in triflic acid at 0–18°C to give the isomeric 2,3-dihydro-4(1H)-quinolones (2). Dehydrogenation of the latter compounds using 10% Pd on C in 1.0 M aqueous sodium hydroxide/propan-2-ol mixtures at ca. 82°C provides the corresponding 4(1H)-quinolones (3).