Nonreductive Desulfenylation of 3-Indolyl Sulfides. Improved Syntheses of 2-Substituted Indoles and 2-Indolyl Sulfides
摘要:
Desulfenylation of 3-indolyl sulfides to the corresponding 3-unsubstituted indoles is usually carried out under reductive conditions, thus accommodating only substituents which are resistant to reduction. We have developed a nonreductive procedure for removal of a sulfide at the 3-position of indoles, using trifluoroacetic acid in the presence of a thiol as trapping agent, which is compatible with a large array of functionalities on the indole ring. In addition, the desulfenylation occurs selectively at the 3-position of the indole, and sulfide groups at other positions of the molecule remain untouched. Thus, indole 2,3-bis-sulfides are selectively desulfenylated at the 3-position, affording 3-unsubstituted 2-indolyl sulfides. This methodology broadens the use of sulfide as a protecting group for the 3-position of indoles.
Iodine-catalysed versatile sulfenylation of indoles with thiophenols: controllable synthesis of mono- and bis-arylthioindoles
作者:Hailei Zhang、Xiaoze Bao、Yuming Song、Jingping Qu、Baomin Wang
DOI:10.1016/j.tet.2015.09.070
日期:2015.11
A versatile method for the synthesis of mono- and bis-arylthioindoles via I2 catalysed direct oxidative sulfenylation of indoles with thiophenols (especially mercaptobenzoic acids) has been presented. This system features environmental friendliness, easy operation, and mild reaction conditions, and shows a broad functional group tolerance furnishing good to excellent yields.
1,2,3-trisubstituted indoles for treatment of inflammation
申请人:Syntex (U.S.A.) Inc.
公开号:US04654360A1
公开(公告)日:1987-03-31
Disclosed are compounds of the formula ##STR1## wherein the several groups are defined herein. These compounds are useful for treating inflammation.
揭示了以下化合物的结构式 ##STR1## 其中各个基团在此处定义。这些化合物可用于治疗炎症。
Controllable Synthesis of Mono‐ and Bis‐sulfenylindoles from Indoles and Various Sulfenylation Agents Using KI/SeO
<sub>2</sub>
System
作者:Thewika Benchawan、Rungnapha Saeeng
DOI:10.1002/ejoc.202200752
日期:2022.10.13
An efficient method for selective and controllable sulfenylation of indoles to synthesize mono- and bis-sulfenylindoles was reported by using a novel aerobic catalytic oxidation system KI/SeO2 for sulfenylation of indoles with disulfide/thiols. The method is scalable, not sensitive to moisture, and can proceed without metalcatalyst.