POCl3
-Promoted Trifluoromethylthiolation-Based Vicinal Bifunctionalization of Indoles with CF3
SO2
Na
摘要:
An efficient trifluoromethylthiolation‐based vicinal bifunctionalization of indoles with sodium trifluoromethanesulfinate in the presence of phosphorus oxychloride were achieved to introduce a chlorine atom into the 2‐position under transition‐metal‐free and mild conditions. The protocol could also extend to other sodium perfluoroalkanesulfinates or phosphorus oxybromide. The possible pathway was proposed based on the experimental results.
Organophosphorus‐Catalyzed Deoxygenation of Sulfonyl Chlorides: Electrophilic (Fluoroalkyl)sulfenylation by P
<sup>III</sup>
/P
<sup>V</sup>
=O Redox Cycling
作者:Avipsa Ghosh、Morgan Lecomte、Shin‐Ho Kim‐Lee、Alexander T. Radosevich
DOI:10.1002/anie.201813919
日期:2019.2.25
lyzed deoxygenative O‐atom transfer from sulfonyl chlorides is reported. This C−S bond‐forming reaction is catalyzed by a readily available small‐ring phosphine (phosphetane) in conjunction with a hydrosilane terminal reductant to afford a general entry to sulfenyl electrophiles, including valuable trifluoromethyl, perfluoroalkyl, and heteroaryl derivatives that are otherwise difficult to access. Mechanistic
Transition-Metal-Free Direct Trifluoromethylthiolation and Trifluoromethylsulfoxidation of Electron-Rich Aromatics with CF<sub>3</sub>SO<sub>2</sub>Na in the Presence of PCl<sub>3</sub>
作者:Xia Zhao、Aoqi Wei、Bo Yang、Tianjiao Li、Quan Li、Di Qiu、Kui Lu
DOI:10.1021/acs.joc.7b01226
日期:2017.9.1
A new transition-metal-free route for the direct trifluoromethylthiolation and trifluoromethylsulfoxidation of electron-rich aromatics with CF3SO2Na in the presence of PCl3 was developed. Notably, PCl3 was used as a reducing and chlorination reagent. The transition-metal-free protocol utilized cheap and readily available reagents and exhibited good atom economy; therefore, it will serve as an alternative
开发了一种新的无过渡金属的路线,用于在PCl 3存在下用CF 3 SO 2 Na直接进行富电子芳族化合物的直接三氟甲基硫醇化和三氟甲基硫氧化。值得注意的是,PCl 3被用作还原和氯化试剂。不含过渡金属的方案使用廉价且容易获得的试剂,并具有良好的原子经济性;因此,它将作为富电子芳族化合物的三氟甲基硫醇化和三氟甲基磺酰氧化的替代和实用策略。
Transition-metal-free direct trifluoromethylthiolation of electron-rich aromatics using CF3SO2Na in the presence of PhPCl2
作者:Xia Zhao、Xiancai Zheng、Miaomiao Tian、Jianqiao Sheng、Yifan Tong、Kui Lu
DOI:10.1016/j.tet.2017.11.019
日期:2017.12
A novel transition metal-free route for the direct trifluoromethylthiolation of electron-rich aromatics using CF3SO2Na in the presence of PhPCl2 was developed. More specifically, PhPCl2 was used as both a reducing and a chlorinating reagent for the first time in this CF3SO2Na-based trifluoromethylthiolation reaction. The absence of transition metals and the use of cheap and readily available reagents
开发了一种新颖的无过渡金属的路线,该路线用于在PhPCl 2存在下使用CF 3 SO 2 Na直接进行富电子芳族化合物的三氟甲基硫醇化。更具体地,在基于CF 3 SO 2 Na的三氟甲基硫醇化反应中,PhPCl 2首次被用作还原剂和氯化剂。过渡金属的缺乏以及廉价和容易获得的试剂的使用使该方法成为富电子芳族化合物三氟甲基硫醇化的替代和实用策略。
Direct Trifluoromethylthiolation and Perfluoroalkylthiolation of C(sp
<sup>2</sup>
)H Bonds with CF
<sub>3</sub>
SO
<sub>2</sub>
Na and R
<sub>f</sub>
SO
<sub>2</sub>
Na
A new method for CF3SO2Na‐based direct trifluoromethylthiolation of C(sp2)H bonds has been developed. CF3SSCF3 is generated in situ from cheap and easy‐to‐handle CF3SO2Na, and in the presence of CuCl can be used for electrophilic trifluoromethylthiolation of indoles, pyrroles, and enamines. The method has been extended to perfluoroalkylthiolation reactions using RfSO2Na.
已开发出一种基于CF 3 SO 2 Na的C(sp 2)H键直接三氟甲基硫醇化的新方法。CF 3 SSCF 3是由便宜且易于处理的CF 3 SO 2 Na原位生成的,在存在CuCl的情况下,可用于吲哚,吡咯和烯胺的亲电三氟甲基硫醇化反应。该方法已扩展到使用R f SO 2 Na的全氟烷基硫醇化反应。