Stannous Chloride-Mediated Reductive Cyclization−Rearrangement of Nitroarenyl Ketones
作者:Dallas K. Bates、Kexue Li
DOI:10.1021/jo0259921
日期:2002.11.1
Instead, 6-methyl-11a, 12-dihydro-6H-quino[3,2-b][1,4]benzothiazine (3) was produced in excellent yield, presumably via novel Sn (IV)-mediated amidine formation from the initial aniline reduction product. Under identical reaction conditions, 2-(2-nitrophenyl)-thiochroman-4-one (6) produces ethyl 5,11-dihydrodibenzo[b,e][1,4]thiazepin-11-ylacetate (7). A novel semipinacol rearrangement is proposed to account