Conjugate base catalysed one-pot synthesis of pyrazoles from β-formyl enamides
摘要:
A novel one-pot synthesis of pyrazoles has been accomplished by the reaction of beta-formyl enamides with hydroxylamine hydrochloride catalysed by potassium dihydrogeriphosphate in acid medium. (c) 2005 Elsevier Ltd. All rights reserved.
A novel and efficient synthesis of pyrimidine from p-formyl enamide is described. The key step involves samarium chloride catalysed cyclisation of β-formyl enamides using urea as source of ammonia under microwave irradiation.