A photocatalyzed formal (3+2) cycloaddition has been developed to construct original polysubstituted α‐SCF3 cyclopentanones in a regio‐ and diastereoselective manner. This building block approach leverages trifluoromethylthio alkynes and branched / linear aldehydes, as readily available reaction partners, in consecutive hydrogen atom transfers and C–C bond formations. Difluoromethylthio alkynes are also compatible subtrates. Furthermore, the potential for telescoped reaction starting from alcohols instead of aldehydes was demonstrated, as well as process automatization and scale‐up under continuous microflow conditions. This prompted density functional theory calculations to support a free radical‐mediated cascade hydrogen atom transfer process.
Metal-Free Oxidative Trifluoromethylthiolation of Terminal Alkynes with CF<sub>3</sub>SiMe<sub>3</sub> and Elemental Sulfur
作者:Chao Chen、Lingling Chu、Feng-Ling Qing
DOI:10.1021/ja305801m
日期:2012.8.1
A metal-free oxidative trifluoromethyl-thiolation of terminalalkynes using readily available CF(3)SiMe(3) and elemental sulfur at room temperature has been developed. This reaction provides an efficient and convenient method for the preparation of alkynyl trifluoromethyl sulfides bearing a wide range of functional groups. Preliminary investigation revealed that elemental sulfur instead of air acted
A large number of trifluoromethylthiolation methods have been developed, but a trifluoromethylthiolation reagent usually has to be used in these methods. Herein we describe a difluorocarbene-based trifluoromethylthiolation of terminal alkynes to construct a Csp-SCF3 bond catalysed by a copper complex. Ph3P+CF2CO2-/S8/F- was used as a reagent system to form the CF3S- anion, and the sequential formation
已经开发了大量的三氟甲基硫醇化方法,但是在这些方法中通常必须使用三氟甲基硫醇化试剂。在本文中,我们描述了末端炔烃的基于二氟卡宾的三氟甲基硫醇化,以构建由铜配合物催化的Csp-SCF 3键。用Ph 3 P + CF 2 CO 2- / S 8 / F-作为试剂体系形成CF 3 S-阴离子,依次形成CF 2 = S,F-CF 2 S和C-SCF 3一步一步就可以实现纽带。
Direct Catalytic Trifluoromethylthiolation of Boronic Acids and Alkynes Employing Electrophilic Shelf-Stable<i>N</i>-(trifluoromethylthio)phthalimide
作者:Roman Pluta、Pavlo Nikolaienko、Magnus Rueping
DOI:10.1002/anie.201307484
日期:2014.2.3
for the synthesis of N‐(trifluoromethylthio)phthalimide, a convenient and shelf‐stable reagent for the direct trifluoromethylthiolation, has been developed. N‐(Trifluoromethylthio)phthalimide can be used as an electrophilic source of F3CS+ and reacts readily with boronic acids and alkynes under copper catalysis. The utility of CF3S‐containing molecules as biologically active agents, the mild reaction
Oxidative Trifluoromethylthiolation of Terminal Alkynes with AgSCF<sub>3</sub>: A Convenient Approach to Alkynyl Trifluoromethyl Sulfides
作者:Sheng-Qing Zhu、Xiu-Hua Xu、Feng-Ling Qing
DOI:10.1002/ejoc.201402533
日期:2014.7
new method for the efficient synthesis of alkynyl trifluoromethyl sulfides was developed. By combining AgSCF3 and NCS in N,N-dimethylacetamide, an electrophilic active intermediate was produced, which was then treated with a variety of terminalalkynes to afford the corresponding trifluoromethanesulfenylated products in moderate to excellent yields.
A photocatalyzed formal (3+2) cycloaddition has been developed to construct original polysubstituted α‐SCF3 cyclopentanones in a regio‐ and diastereoselective manner. This building block approach leverages trifluoromethylthio alkynes and branched / linear aldehydes, as readily available reaction partners, in consecutive hydrogen atom transfers and C–C bond formations. Difluoromethylthio alkynes are also compatible subtrates. Furthermore, the potential for telescoped reaction starting from alcohols instead of aldehydes was demonstrated, as well as process automatization and scale‐up under continuous microflow conditions. This prompted density functional theory calculations to support a free radical‐mediated cascade hydrogen atom transfer process.