Li JT, Han JF, Yang JH, Li TS. An efficient synthesis of 3,4-dihydropyrimidin-2-ones catalyzed by NH2SO3H under ultrasound irradiation.
ULTRASONICS SONOCHEMISTRY 2003;
10:119-122. [PMID:
12726946 DOI:
10.1016/s1350-4177(03)00092-0]
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Abstract
The condensation of aldehydes, beta-keto esters and urea catalyzed by NH(2)SO(3)H in ethanol results dihydropyrimidinones in high yields under ultrasound irradiation.
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