allyl, 4-pentenyl, and benzyl α-glycosides of maltose, cellobiose, and lactose were prepared (17–77% yield; α/β = 70/30–96/4) via a direct reaction of the free disaccharides with a binary AcBr–AcOH mixture, followed by glycosidation with alcohol using FeCl3 in MeNO2 or CH2Cl2, Zemplen deacetylation, and resolution of the anomeric mixture of glycosides by chromatography. Using MeCN as solvent for the
Micelle-mediated multicomponent cross-coupling in water: general construction of 3-chalcogenylindoles
作者:Xi He、Weili Song、Xuemin Liu、Jiamin Huang、Ruilong Feng、Shaodong Zhou、Jianquan Hong、Xin Ge
DOI:10.1039/d2gc03694k
日期:——
A general and sustainable multicomponent cross-coupling for the construction of 3-chalcogenylindoles from indoles with aryl iodides and elemental sulfur under the aqueous micellar condition was developed. Elemental sulfur is employed as an eco-friendly and easy-handling sulfur source of thiyl radicals. The synergic effect between Cu catalysts and micelles formed by the sugar-based surfactant GluM can