Silaichev PS, Beryozkina TV, Melekhin VV, Filimonov VO, Maslivets AN, Ilkin VG, Dehaen W, Bakulev VA. Cycloaddition reactions of heterocyclic azides with 2-cyanoacetamidines as a new route to
C,
N-diheteroarylcarbamidines.
Beilstein J Org Chem 2024;
20:17-24. [PMID:
38213842 PMCID:
PMC10783006 DOI:
10.3762/bjoc.20.3]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 12/22/2023] [Indexed: 01/13/2024] Open
Abstract
A novel and efficient base-catalyzed, transition-metal-free method for the synthesis of diheterocyclic compounds connected by an amidine linker, including apart from the common 1,2,3-triazole ring, either an additional pyrimidinedione, 4-nitroimidazole, isoxazole, 1,3,4-triazole, 2-oxochromone or thiazole ring, has been developed. The process was facilitated by a strong base and includes the cycloaddition reaction of 3,3-diaminoacrylonitriles (2-cyanoacetamidines) to heterocyclic azides followed by a Cornforth-type rearrangement to the final products. The reaction is tolerant to various N-monosubstituted 3,3-diaminoacrylonitriles and to different heterocyclic azides. The developed method has a broad scope and can be applied to obtain a variety of N-heteroaryl-1,2,3-triazole-4-carbimidamides with alkyl, allyl, propargyl, benzyl, cycloalkyl, and indolyl substituents at the N1 position .
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