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An efficient metal-free and catalyst-free C–S/C–O bond-formation strategy: synthesis of pyrazole-conjugated thioamides and amides
oleh: Shubham Sharma, Dharmender Singh, Sunit Kumar, Vaishali, Rahul Jamra, Naveen Banyal, Deepika, Chandi C. Malakar, Virender Singh
Format: | Article |
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Diterbitkan: | Beilstein-Institut 2023-03-01 |
Deskripsi
An operationally simple and metal-free approach is described for the synthesis of pyrazole-tethered thioamide and amide conjugates. The thioamides were generated by employing a three-component reaction of diverse pyrazole C-3/4/5 carbaldehydes, secondary amines, and elemental sulfur in a single synthetic operation. The advantages of this developed protocol refer to the broad substrate scope, metal-free and easy to perform reaction conditions. Moreover, the pyrazole C-3/5-linked amide conjugates were also synthesized via an oxidative amination of pyrazole carbaldehydes and 2-aminopyridines using hydrogen peroxide as an oxidant.