Novel heterocycles. Synthesis of 2,3-dihydro-6-methyl-2-phenyl-4<i>H</i>,6<i>H</i>-pyrano[3,2-c][2,1]benzothiazin-4-one 5,5-dioxide and related compounds
作者:Frank T. Coppo、Maged M. Fawzi
DOI:10.1002/jhet.5570350433
日期:1998.7
give the C-cinnamoyl compound, 3-(2,4-dichlorophenyl)-1-(4-hydroxy-1-methyl-2,2-dioxido-1H-2,1-benzothiazin-3yl)-2-propen-1-one (15). On the other hand, 1-methyl-2,2-dioxido-1H-2,1-benzothiazin-4-yl 3-phenyl-2-propenoate (19) (from cinnamoyl chloride (17) and compound 4) rearranged to give 2,3-dihydro-6-methyl-2-phenyl-4H,6H-pyrano[3,2-c][2,1]benzothiazin-4-one 5,5-dioxide (21), an example of a hitherto
2-氯-4-(甲基磺酰基)苯甲酰氯(5)与1-甲基-1 H -2,1-苯并噻嗪-4-(3 H)-一个2,2-二氧化物(4)的反应得到O -苯甲酰基化合物,1-甲基-2,2-二氧化物-1 H -2,1-苯并噻嗪-4-基-2-氯-4-(甲基磺酰基)苯甲酸酯(6),重排后得到C-苯甲酰基异构体, [2-氯-4-(甲基磺酰基)苯基](4-羟基-1-甲酰基-2,2-二氧化基-1 H -2,1-苯并噻嗪-3-基)甲酮(7)。通过向化合物4中添加2,4-二氯肉桂酰氯(11)而得到的O-肉桂酰化合物13重排得到C-肉桂酰基化合物,3-(2,4-二氯苯基)-1-(4-羟基-1-甲基-2,2-二氧化基-1 H -2,1-苯并噻嗪-3基)-2- propen-1-one(15)。另一方面,3-苯基-2-丙酸酯的1-甲基-2,2-二氧化基-1 H -2,1-苯并噻嗪-4-基(19)(来自肉桂酰氯(17)和化合物4)重新排列为给出2