The preparation of E and Z isomers of 3-ureido-2-cyano-2-propenoates Ia - Id and their base-catalyzed isomerization and cyclization to 5-carboxycytosine derivatives IIa - IIf and 5-cyanouracil derivatives IIIa and IIIb is described. Also described is the preparation of 3-ureido-2-acyl-2-propenoates Va - Vd and their base-catalyzed cyclization to 5-carboxy-2(1H)-pyrimidone derivatives VIa - VIc and 5-acyluracils VIIa - VIIc.
描述了3-
脲基-2-
氰基-2-
丙烯酸酯的
Ia -
Id的
E和
Z异构体的制备,以及它们的碱催化异构化和环化到5-羧基
胞嘧啶衍
生物IIa -
IIf和5-
氰基尿
嘧啶衍
生物IIIa和
IIIb。还描述了3-
脲基-2-酰基-2-
丙烯酸酯
Va -
Vd的制备及其碱催化环化到5-羧基-2(1
H)-
嘧啶酮衍
生物VIa -
VIc和5-酰基尿
嘧啶VIIa -
VIIc。