Conversions of thiochroman-4-ones into 1,2-benzothiazepine, benzo-[b]thiophen, and 1,2-benzisothiazole systems via sulphimide intermediates
作者:Yasumitsu Tamura、Yasushi Takebe、Said Mohamad M. Bayomi、Chisato Mukai、Masazumi Ikeda、Masao Murase、Masahiro Kise
DOI:10.1039/p19810001037
日期:——
Reaction of thiochroman-4-ones (1a–g) with chloramine-T gave the corresponding N-tosylsulphimides (2a–g) and sulphoxides (5a–g). The N-tosylsulphimides (2a–d), on reaction with triethylamine in chloroform, gave 2-tosyl-2,3-dihydro-1,2-benzothiazepin-5(4H)-ones (3a–d), but the 2-methyl congeners (2e and f) yielded 2-crotonoyl-N-tosylbenzenesulphenamides (4e and f). When the reaction was carried out
thiochroman-4-ones(1a–g)与氯胺-T的反应产生了相应的N-甲苯磺酰亚砜(2a–g)和亚砜(5a–g)。所述Ñ -tosylsulphimides(图2a-d),在用氯仿中的三乙胺反应,得到2-甲苯磺酰基-2,3-二氢-1,2-苯并硫氮杂-5(4 ħ) -酮(图3a-d),但2 -甲基同类物(2e和f)产生2-巴豆酰-N-甲苯磺酰基苯磺酰胺(4e和f)。当反应在乙腈中进行时,(2e和f)得到(3e和f)和(Z)-2-亚乙基-2,3-二氢苯并[ b ]噻吩-3(2 H)-(7e和f)。2,2-二甲基衍生物(2g)仅产生(4g)和(7g)。在含氯仿中加热时,在乙酸中加热(2a–c),得到狄尔斯-阿尔德二聚体(6a–c),分别为2-亚甲基-2,3-二氢苯并[ b ]噻吩-3-酮和(2e–g)。乙酸,得(7e–g)。用O-亚甲基亚磺酰基羟胺进行S-胺(1a,b和df)的胺化反应,然后进行碱处理,得到3-乙烯基-1