Deoxytrifluoromethylthiolation and Selenylation of Alcohols by Using Benzothiazolium Reagents
作者:Stefan Dix、Michael Jakob、Matthew N. Hopkinson
DOI:10.1002/chem.201901607
日期:2019.6.7
Aliphatic compounds substituted with medicinally important trifluoromethylthio (SCF3) and trifluoromethylselenyl (SeCF3) groups were synthesized directly from alcohols by using the new benzothiazolium salts BT‐SCF3 and BT‐SeCF3. These bench‐stable fluorine‐containing reagents are facile to use and can be prepared in two steps from non‐fluorinatedheteroaromatic starting materials. The metal‐free d
Difluorocarbene‐Derived Trifluoromethylthiolation and [
<sup>18</sup>
F]Trifluoromethylthiolation of Aliphatic Electrophiles
作者:Jian Zheng、Lu Wang、Jin‐Hong Lin、Ji‐Chang Xiao、Steven H. Liang
DOI:10.1002/anie.201505446
日期:2015.11.2
The first trifluoromethylthiolation and [18F]trifluoromethylthiolation of alkyl electrophiles with in situ generated difluorocarbene in the presence of elemental sulfur and external (radioactive) fluoride ion is described. This transition‐metal‐free approach is high yielding, compatible with a variety of functional groups, and operated under mild reaction conditions. The conceptual advantage of this
straightforward synthesis of alkyltrifluoromethyl thioethers was developed that starts from widely available alkyl halides or mesylates and the inexpensive reagents sodium thiocyanate and trimethyl(trifluoromethyl)silane. The alkyl electrophiles are converted in situ into the corresponding thiocyanates, which react with the nucleophilic Ruppert–Prakash reagent to give the corresponding trifluoromethyl thioethers
Direct α-Trifluoromethylthiolation of Carboxylic Acids
Enabled by Boron Catalysis
作者:Chung-Yang Dennis Huang、Yohei Shimizu、Kai Sun、Masaya Sawamura
DOI:10.1055/a-2071-4465
日期:2023.11
A boron-catalyzed direct α-trifluoromethylthiolation of carboxylicacids was developed. Catalytically generated boron enediolates reacts with electrophilic SCF3 reagent, N-SCF3-phthalimide, to provide α-SCF3 carboxylicacids without the need of substrate pre-activation. The method is applicable to direct modification of bioactive carboxylicacids. Data science analyses provided suitable models for
Ph3P+CF2CO2− as an F− and :CF2 source for trifluoromethylthiolation of alkyl halides
作者:Zhuo Liu、Jin Long、Xuan Xiao、Jin-Hong Lin、Xing Zheng、Ji-Chang Xiao、Yu-Cai Cao
DOI:10.1016/j.cclet.2018.11.013
日期:2019.3
As trifluoromethylthiolation has received increasing attention recently, many CF3S-reagents and trifluoromethylthiolation methods have been developed. Herein we describe trifluoromethylthiolation of alkyl halides by using Ph3P+CF2CO2 as a fluoride and difluorocarbene source. Difluorocarbene is a versatile intermediate, but its side reactions are usually ignored and the by-products would therefore be discarded. In this work, a side reaction of difluorocarbene, the generation of a fluoride anion from difluorocarbene, was developed into a synthetic tool. Although the trifluoromethylthiolation reaction involved multi-sequential steps, the cleavage of C-F bond, the formation of CF2=S bond, F-C(S)F-2 bond, and C-SCF3 bond, the conversion proceeded fast and was completed within 10 min. (C) 2018 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.