反应详情

Benzaldehyde, N,N-dimethylglycine ethyl ester and sodium hydride were reacted in ether with the addition of a catalytic amount of ethanol according to the method described in Lieb. Ann. Chem. 703 (1967) 37-43 to give ethyl α-dimethylaminocinnamate. This compound was then reacted according to the method described in Tetrahedron Letters, 46, (1978) 4573-4574 with oxalyl chloride and hydrazine in 60% yield to give ethyl 4-phenyl-3-pyrazolecarboxylate, melting point 164°-165° after recrystallization from ethanol/diethyl ether.