Synthesis and biological activities of tetrahydroquinazoline analogs of aminopterin and methotrexate
作者:Aleem Gangjee、Nurulain Zaveri、Sherry F. Queener、Roy L. Kisliuk
DOI:10.1002/jhet.5570320141
日期:1995.1
8-tetrahydromethotrexate (2) were synthesized as potential inhibitors of dihydrofolate reductase (DHFR) and as antitumor agents. Cyclohexanone-4-carboxaldehyde dimethyl acetal, a key intermediate [10] was synthesized from cyclohexane-1,4-dione monoethylene ketal, which was converted via a Wittig reaction to its exocyclic 4-methylene derivative which in turn, was converted to the 4-aldehyde via a hydroboration-oxidation
(6R,6S)-5,8-二脱氮-5,6,7,8- tetrahydroaminopterin(1)和(6 - [R,6小号)-5,8-二脱氮-5,6,7,8- tetrahydromethotrexate(2)被合成为二氢叶酸还原酶(DHFR)的潜在抑制剂和抗肿瘤剂。关键中间体中间体环己酮-4-羧醛二甲基乙缩醛由环己烷-1,4-二酮单亚乙基缩酮合成,通过Wittig反应转化为其环外4-亚甲基衍生物,然后环己酮转化为4醛通过硼氢化氧化顺序。对4-醛作为二甲基乙缩醛的选择性保护和与双氰胺的环化得到2,4-二氨基-5,6,7,8-四氢喹唑啉的6-二甲基缩醛。保护2,4-二氨基部分和6-醛选择性脱保护,然后用对氨基苯甲酰基-L-谷氨酸还原胺化,得到2,4-双乙酰氨基-5,8-dideaza-5,6,7,8-四氢氨基蝶呤(11)。脱保护11得到1。通过N 10甲基化和脱保护从11获得化合物2。所述Ñ