Synthesis of compounds related to antitumor agents. III. On the additions of acyl halide, dialkyl acetylenedicarboxylate and N-substituted maleimides to 2,4-diamino-5-hydroxy-6-methylpyrimidine.
作者:ISOO ITO、NORIICHI ODA、TETSUO KATO
DOI:10.1248/cpb.24.1189
日期:——
2, 4-Diamino-5-hydroxy-6-methylpyrimidine (I) was reacted with acyl halides to give pyrimido [5, 4-b] [1, 4] oxazin-6 (8H)-ones (IIIa, b). Dialkyl acetylenedicarboxylate was made addition with I to afford alkoxycarbonylmethylene-pyrimido [5, 4-b] [1, 4] oxazines (VI, VII). The configuration of this compound was assumed to be cis from the evidence of building pyridazino or furano ring. Similarly, with maleimide, the adduct (XIV) was obtained and converted to pyrimido [5, 4-b] [1, 4] oxazines (XV, XXIa-f).
2, 4-二氨基-5-羟基-6-甲基嘧啶(I)与酰基卤反应,得到嘧啶并[5, 4-b] [1, 4]恶嗪-6(8H)-酮(IIIa, b)。将乙炔二甲酸二烷基酯与I加成,得到烷氧基羰基亚甲基-嘧啶基[5, 4-b] [1, 4]恶嗪(VI, VII)。从构建哒嗪或呋喃环的证据来看,该化合物的构型被认为是顺式的。类似地,使用马来酰亚胺,获得加合物(XIV)并将其转化为嘧啶并[5, 4-b] [1, 4]恶嗪(XV, XXIa-f)。