The efficient synthesis of Hantzsch 1,4-dihydropyridines via metal-free oxidative CC coupling by HBr and DMSO
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Add time:09/03/2019 Source:sciencedirect.com
A novel and efficient synthesis of Hantzsch 1,4-dihydropyridines through metal-free oxidative CC coupling process was described. The reaction between benzylic alcohols, 1,3-dicarbonyl compounds and ammonium hydroxide in the presence of HBr in DMSO at 75 °C led to afford 1,4-dihydropyridine in excellent yields. This protocol introduces the use of benzyl alcohols instead of aldehydes as a new modification of the Hantzsch reaction.
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