We have developed a photoinduced oxidative cross-coupling of thiophenols with alcohols for O–S bond formation. The protocol uses visible light, a metal-free photocatalyst, and oxygen as the oxidant for the selectivesynthesis of alkyl benzenesulfonates; no ligand co-additive is necessary. Mechanistic studies suggested that the disulfide and alkyl benzenesulfinate are involved as intermediates and that
Copper-Catalyzed Multicomponent Reaction of DABCO·(SO<sub>2</sub>)<sub>2</sub>, Alcohols, and Aryl Diazoniums for the Synthesis of Sulfonic Esters
作者:Yang Wang、Lingling Deng、Yu Deng、Jianlin Han
DOI:10.1021/acs.joc.8b00447
日期:2018.4.20
A Cu-catalyzed multicomponent cascade reaction of DABCO·(SO2)2 (DABSO), alcohol, and aryl diazonium tetrafluoroborate was developed which afforded sulfonic esters in moderate to good chemical yields. In this reaction, the SO2 surrogate DABSO was used for the first time in the synthesis of sulfonic aliphatic esters. This multicomponent reaction was carried out under mild conditions and tolerated a wide
This invention relates to novel compounds having the structural formula I below:
and to their pharmaceutically acceptable salt, compositions and methods of use. These novel compounds provide a treatment or prophylaxis of cognitive impairment, Alzheimer Disease, neurodegeneration and dementia.