5H-[1,2,4]Oxadiazolo[5,4-d][1,5]benzothiazepines: Synthesis and Stereochemistry
摘要:
The functionalization of the thiazepine system by 1,3-dipolar cycloaddition of benzonitriloxide to the C=N double bond of 1,5-benzothiazepine derivatives, is described. The configurational and conformational properties of the 3a,4-dihydro-1-phenyl-5H-[1,2,4]oxadiazolo[5,4-d][1,5]benzothiazepines have been determined by nmr spectroscopy assisted by NOE measurements.
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
The functionalization of the thiazepine system by 1,3-dipolar cycloaddition of benzonitriloxide to the C=N double bond of 1,5-benzothiazepine derivatives, is described. The configurational and conformational properties of the 3a,4-dihydro-1-phenyl-5H-[1,2,4]oxadiazolo[5,4-d][1,5]benzothiazepines have been determined by nmr spectroscopy assisted by NOE measurements.