Citation: Tang Nana, Shao Xin, Wang Mingyang, Wu Xinxin, Zhu Chen. Sulfonyl Chlorides Mediated Alkynylation of Non-activated Alkenes via Distal Alkynyl Group Migration[J]. Acta Chimica Sinica, ;2019, 77(9): 922-926. doi: 10.6023/A19050158 shu

Sulfonyl Chlorides Mediated Alkynylation of Non-activated Alkenes via Distal Alkynyl Group Migration

Tang Nana ^a,† ,
Shao Xin ^a,† ,
Wang Mingyang ^a ,
Wu Xinxin ^a ,
Zhu Chen ^a,b,,

a.
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123
b.
Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032

Corresponding author: Zhu Chen, chzhu@suda.edu.cn
Received Date: 1 May 2019
Available Online: 4 September 2019
Fund Project: Project supported by the National Natural Science Foundation of China (No. 21722205)the National Natural Science Foundation of China 21722205

Figures(4)

Radical-mediated difunctionalization of alkenes through the remote functional group migration (FGM) process paves an ingenious avenue for simultaneous cleavage and reconstruction of C-C bonds. Recently, our group has systematically disclosed the strategy of remote FGM for radical-mediated difunctionalization of unactivated alkenes. A portfolio of functional groups including cyano, heteroaryl, alkynyl, oximino, and carbonyl showcase the migratory aptitude, leading to new C-C bonds under radical conditions. Meanwhile, a series of other chemical bonds such as C-C, C-N, C-P, C-Si, and C-S are readily constructed in the reaction. Considering the synthetic utility and flexible transformation of alkynes, the radical alkynylation of unactivated alkenes via remote alkynyl migration we firstly reported provides an efficient approach for the incorporation of alkynes and has received considerable attention. On the other hand, fluorine-and sulfonyl-containing molecules play vital roles in organic and medicinal chemistry owing to their important chemical and physical characters. Therefore, the concomitant introduction of an alkynyl and a trifluoromethyl/sulfonyl group into one molecule is of great synthetic value. Herein we report a useful method for carbo-trifluoroalkylation/sulfonylation of unactivated olefins. The addition of extrinsic radical to alkene triggers the intramolecular FGM via a five-membered transition state along with a cascade of bond fission and formation. The typical procedure is as follows:a mixture of propargyl alcohol 1, sulfonyl chloride, fac-Ir(ppy)₃, and base is loaded in a flame-dried reaction vial which is subjected to evacuation/flushing with nitrogen three times. Solvent is added to the mixture via syringe and the mixture is then stirred at 25℃ until the starting material is consumed monitored by TLC. The mixture is concentrated, and purified by flash column chromatography on silica gel (eluent:petroleum ether/ethyl acetate) to give the product.
- alkynylation,
- trifluoromethylation,
- carbosulfonylation,
- alkene difunctionalization,
- functional group migration
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