Low-valent Titanium Induced Simultaneous Reduction of Nitro Group and S-S Bond in Nitrodisulfides: A Novel Method For the Synthesis of Benzothiazoline, Benzothiazoles and 2,3-Dihydro- 1,5-benzothiazepines
作者:Weihui Zhong、Xiaoyuan Chen、Yongmin Zhang
DOI:10.1080/00397910008087072
日期:2000.12.1
Abstract The simultaneousreduction of nitrogroup and S-S bond in nitrodisulfides by TiCl4/Sm system leds to the active intermediates 2, which were “living” double-anions (nitride anions and sulfide anions) in situ. These new anion species reacted smoothly with aldehydes or ketones, acid chlorides or acid anhydrides and α,β-unsaturated ketones respectively to afford the desired benzothiazolines, benzothiazoles
摘要 TiCl4/Sm 系统同时还原硝基二硫化物中的硝基和 SS 键,产生活性中间体 2,即原位“活性”双阴离子(氮化物阴离子和硫化物阴离子)。这些新的阴离子物种分别与醛或酮、酰氯或酸酐和 α,β-不饱和酮顺利反应,在温和和中性条件下以良好的收率得到所需的苯并噻唑啉、苯并噻唑和 2,3-二氢-1,5-苯并噻嗪使适应。
Conversion of bis(o-nitrophenyl)disulfides to heterocycles containing sulfur and nitrogen by the action of samarium diiodide
作者:Weihui Zhong、Xiaoyuan Chen、Yongmin Zhang
DOI:10.1002/hc.1025
日期:——
Treatment of bis(o-nitrophenyl)disulfides 1 with SmI2 led to simultaneous reduction of nitro groups and reductive cleavage of S–S bonds as well as the formation of the active intermediates 2. The intermediates 2 reacted smoothly with aldehydes or ketones, acid chlorides or anhydrides, α-bromoketones, and α,β-unsaturated ketones at room temperature to afford the desired benzothiazolines 3, benzothiazoles