Wang X, Zhao Q, Fang Y, Cai M, Chen Y, Dai L. Copper-Catalyzed C-N Bond Cleavage: Synthesis of N-Sulfonylformamidines from N-( 2-pyridinylmethyl)benzenesulfonamides.
Curr Org Synth 2022;
19:797-807. [PMID:
35400320 DOI:
10.2174/1570179419666220408000751]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 02/02/2022] [Accepted: 02/10/2022] [Indexed: 11/22/2022]
Abstract
AIMS
Find an innovative approach to synthesizing N-sulfonylformamidines from new N source.
BACKGROUND
N-sulfonylamidines have gained considerable attention from school and industry because of unique bioactivity. Since Pinner's strategy, expanding the synthesis methods of N-sulfonylamidines has been the goal of many organic chemists over the past decades. Beside of the crash reaction conditions and the participation of undesirable reagents, the production of N-sulfonylamidines commonly required unstable ammonia and azides as the source of nitrogen which hindered the further development and application of N-sulfonylamidine derivatives.
OBJECTIVE
Find a stable N source to replace NaN3 or NH3 to synthesis N-sulfonylamidines.
METHOD
Firstly, N-( 2-pyridinylmethyl)benzenesulfonamides were smoothly synthesized via 2-pyridinemethanamine and sulfonyl chlorides. Then the reaction conditions of N-(2-pyridinylmethyl)benzenesulfonamides and N,N-dimethylformamide dimethyl acetal(DMF-DMA) were screened and optimized: the reaction was processed in glycol at 80 ℃ for 8 hours with the addition of 5 mol% Cu(OAc)2·H2O as catalyst.
RESULT
Taking the advantage of pyridin-2-ylmethyl, a scope of N-Sulfonylformamidines were synthesized from those N-(2-pyridinylmethyl)benzenesulfonamides under copper-catalyzed C-N bond cleavage.
CONCLUSION
This ready synthetic method will be more a promising inspiration of bioactive compound synthesis and drug development than of an innovative approach to synthesizing N-sulfonylformamidines.
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