Synthesis 2021; 53(16): 2850-2864
DOI: 10.1055/a-1482-2486
paper

Nickel-Catalyzed Difunctionalization of Alkynyl Bromides with Thiosulfonates and N-Arylthio Succinimides: A Convenient Synthesis of 1,2-Thiosulfonylethenes and 1,1-Dithioethenes

Arram Haritha Kumari
a   Department of Chemistry, University College of Science, Osmania University, Hyderabad 500 007, India   URL: https://www.rjreddyresearchgroup.com/
,
Jangam Jagadesh Kumar
a   Department of Chemistry, University College of Science, Osmania University, Hyderabad 500 007, India   URL: https://www.rjreddyresearchgroup.com/
,
Gamidi Rama Krishna
b   X-ray Crystallography, CSIR-National Chemical Laboratory, Pune 411 008, India
,
Raju Jannapu Reddy
a   Department of Chemistry, University College of Science, Osmania University, Hyderabad 500 007, India   URL: https://www.rjreddyresearchgroup.com/
› Author Affiliations
We thank the Department of Science and Technology, Ministry of Science and Technology, India, Women Scientists Scheme-A (WOS-A) [SR/WOS-A/CS-14/2019] for financial assistance. Our special thanks also go to the Department of Science and Technology-Promotion of University Research and Scientific Excellence (DST-PURSE), Ministry of Science and Technology, India (SR/PURSE Phase 2/32/G) programme for partial funding support. R.J.R. thanks the University Grants Commission (UGC) for a faculty position under the Faculty Recharge Programme. A.H.K. thanks WOS-A for her research fellowship. J.J.K. thanks DST Inspire for his research fellowship.


Abstract

An efficient nickel-catalyzed vicinal thiosulfonylation of 1-bromoalkynes with thiosulfonates in the presence of cesium carbonate is described. An operationally simple and highly regioselective atom transfer radical addition (ATRA) of alkynyl bromides provides a wide range of (E)-1,2-thiosulfonylethenes (α-aryl-β-thioarylvinyl sulfones) in moderate to high yields. The extensive substrate scope of both alkynyl bromides and thiosulfonates is explored with a broad range of functional groups. Indole-derived 1,1-bromoalkenes were also successfully explored in this 1,2-thiosulfonylation process. Moreover, the nickel-catalyzed geminal-dithiolation of alkynyl bromides with N-arylthio succinimides provides 1,1-dithioalkenes in high yields. The present protocol is reliable on gram scale, and a sequential one-pot bromination and thiosulfonylation of phenylacetylene is achieved in a scale-up synthesis. Following control experiments, a plausible mechanism is proposed to rationalize the experimental outcome and the vicinal thio­sulfonylation.

Supporting Information



Publication History

Received: 03 March 2021

Accepted after revision: 14 April 2021

Accepted Manuscript online:
14 April 2021

Article published online:
04 May 2021

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