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An efficient method to obtain 4-alkoxy-2-oxo-but-3-enoic acid ethyl esters [EtO 2 CC(O)C(R 2 )=C(R 1 )OR, where R = Me, Et; R 1 = Me, Ph, 4-MeC 6 H 4 , 4-BrC 6 H 4 , 4-FC 6 H 4 ; R 2 = H, Me] from the acylation of enol ethers or acetals with ethyl oxalyl chloride is reported. The cyclocondensation reaction of these substrates and their trifluoromethylated analogues [CF 3 C(O)C(R 2 )=C(OR)R 1 ] with salicylic hydrazide furnished a series of ethyldoi:10.3998/ark.5550190.0008.g28 fatcat:wsrp6sakyndgrouncw26eacvou