曙红-Y(EY)介导的烯烃烷基磺酰基氰化反应显示出可提供高收率的烷基磺酰基腈。根据瞬态吸收光谱法,反应通过光致电子从3 EY *转移至原位形成的光催化剂的O氰化衍生物而进行,并生成了被EY •氧化的亚磺酸盐。变成磺酰基。将后者加到烯烃上,然后进行自由基氰基基团转移,然后将腈与维持自由基链的RSO 2自由基一起提供。
The catalytic activity of β‐cyclodextrin immobilized on Dowexresin as an efficient solid‐liquid phase transfer catalyst was developed for the synthesis of alkyl thiocyanates and phenacyl derivatives in water. The nucleophilicsubstitutionreactions were performed under mild reaction condition and gave the products in excellent yields. Furthermore, the catalyst could be recycled by facile separation
Thiocyanation and 2-Amino-1,3-thiazole Formation in Water Using Recoverable and Reusable Glycosylated Resorcin[4]arene Cavitands
作者:Ali A. Husain、Kirpal S. Bisht
DOI:10.1021/acs.joc.0c01150
日期:2020.8.7
resorcin[4]arene cavitand glycoconjugates (RCGs) have been applied as efficient recoverable and reusable inverse phase transfer catalysts for eco- and environmentally friendly thiocyanation and 2-amino-1,3-thiazole formation reactions in water. The results show that RCGs (1 mol %) were capable of hosting and catalyzing various water-insoluble bromo/thiocyanato substrates in water without the use of any co-organic
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。
Nature of the carbonium ion. VIII. Cycloalkyl cations from thiocyanate isomerizations
作者:Langley A. Spurlock、Richard K. Porter、Walter G. Cox