Direct Photocatalytic S–H Bond Cyanation with Green “CN” Source
作者:Wei Guo、Wen Tan、Mingming Zhao、Lvyin Zheng、Kailiang Tao、Deliang Chen、Xiaolin Fan
DOI:10.1021/acs.joc.8b00887
日期:2018.6.15
Herein we report a novel C–S bond cleavage and reconstruction strategy for the synthesis of thiocyanates through direct photocatalytic S–Hbond cyanation from thiols and inorganic thiocyanate salts. In our strategy, the unprecedented example of cutting off C–S bond of SCN– to deliver the green “CN” sources is demonstrated. This transformation features nontoxic and inexpensive “CN” sources, available
COMPOUNDS WITH COPPER- OR ZINC-ACTIVATED TOXICITY AGAINST MICROBIAL INFECTION
申请人:Kansas State University Research Foundation
公开号:US20220024877A1
公开(公告)日:2022-01-27
Heterocyclic compounds with a novel pyrazole thioamide-based NNSN structural motif, having highly effective zinc- or copper-activated toxicity against microbial infections at micromolar or nanomolar minimum inhibitory concentrations (MIC), and methods of making and using same.
A new protocol for the preparation of aryl thiocyanates by the cross-coupling reaction of arylboronicacids with KSCN salt is described. The coupling reaction was catalyzed by 20 mol% of copper acetate in the presence of 2.0 equivalents 4-methylpyridine serving both as ligand and base under 0.2 MPa of molecular oxygen. A variety of arylboronicacids, including those with substituents at ortho position
starting from commercially available thiols or disulfides. Additionally, the application of this mild method to the first total synthesis of psammaplin B is demonstrated. Non-toxic and inexpensive ferricyanide is used as the cyanidesource, which can be activated either in a mechanochemical, solvent-free approach, or in a biphasic solvent system allowing easier work-up. A total of 27 examples is demonstrated
在此,我们描述了两种互补的方法来制备各种有机硫氰酸盐,这些有机硫氰酸盐价格低廉、可靠并遵循可持续化学的原则,从市售的硫醇或二硫化物开始。此外,还展示了这种温和方法在 psammaplin B 的首次全合成中的应用。氰化物源使用无毒且廉价的铁氰化物,可以通过机械化学、无溶剂方法或双相溶剂系统激活,从而更容易进行后处理。总共展示了 27 个示例,具有高达定量的产量。