792-63-2Relevant academic research and scientific papers
Competitive cascade cyclization of 2′-tosyloxychalcones: An easy access to thioflavones and thioaurones
Venkateswarlu, Somepalli,Murty, Gandrotu Narasimha,Satyanarayana, Meka,Siddaiah, Vidavalur
supporting information, p. 2347 - 2354 (2020/07/03)
A new and efficient approach for the synthesis of thioflavones and thioaurones by competitive cascade cyclization of 2′-tosyloxychalcones has been developed. 2′-Tosyloxychalcones were smoothly converted into thioflavones and thioaurones by incorporation of sulfur atom using elemental sulfur and triethylamine in DMSO with good yields. The advantages of the methodology are the formation of both thioflavones and thioaurones in a single step. Easily accessible substrates, mild reaction conditions and compatibility with a broad range of functional groups make this protocol clean and inexpensive.
A new synthesis of 4H-1-benzothiopyran-4-ones using (trimethylsilyl)methylenetriphenylphosphorane
Kumar, Pradeep,Bodas, Mandar S
, p. 9755 - 9758 (2007/10/03)
The reaction of silyl ester of S-acyl(aroyl) thiosalicylic acids 3 with (trimethylsilyl)methylenetriphenylphosphorane 4 in step wise fashion leads to the acylphosphoranes 7, which subsequently undergo intramolecular Wittig cyclization on the thiolester carbonyl to afford the 4H-1-benzothiopyran-4-ones 8 in good to excellent yields.
