K2S2O8 mediated metal free oxidative coupling of alcohols with 1,2-diaminobenzenes for synthesis of benzimidazoles, photophysical and DFT studies

Persulfate promoted regioselective C-1 thiocyanation of imidazo[1,5-a]pyridines under visible light irradiation in water

“…Recently, K 2 S 2 O 8 has been identified as a photoactive oxidising agent, which possesses the potential to initiate free radical organic transformation under visible light and mild reaction conditions. 20,21 In continuation of our interest in K 2 S 2 O 8 mediated radical chemistry 22–24 and photochemistry, 15,25 herein, we have reported a visible-light-induced persulfate-promoted C-1 thiocyanation of imidazo[1,5- a ]pyridines by using potassium thiocyanate under mild reaction conditions (Scheme 1f).…”

A Metal‐Free System for Conversion of Alcohols to Amides Using tert‐Butyl Nitrite

“…Recently, we have demonstrated metal-free oxidative coupling of alcohols with indoles and 1,2-diaminobenzene to synthesize bisindolylmethane and benzimidazole, respectively. [19,20] Herein, we describe developing a novel approach towards synthesizing amides via activated esters from alcohols in the presence of t BuONO.…”