Synthesis and In Vitro Antitumor Activity of Thiophene Analogues of 5-Chloro-5,8-dideazafolic Acid and 2-Methyl-2-desamino-5-chloro-5,8-dideazafolic Acid
作者:R Forsch
DOI:10.1016/s0968-0896(02)00018-4
日期:2002.6
followed by NBS bromination, condensation with di-tert-butyl N-(5-amino-2-thenoyl)-L-glutamate (28), and stepwise cleavage of the protecting groups with ammonia and TFA yielded. Treatment of 9 with acetic anhydride afforded 2,6-dimethyl-5-chlorobenz[1,3-d]oxazin-4-one (31), which on reaction with ammonia, NaOH was converted to 2,6-dimethyl-5-chloro-3,4-dihydroquinazolin-4-one (33). Bromination of, followed
N- [5- [N-(2-氨基-5-氯-3,4-二氢-4-氧代喹唑啉-6-基)甲基氨基] -2-thenoyl] -L-谷氨酸(6)和N- [ 5- [N-(5-氯-3,4-二氢-2-甲基-4-氧代喹唑啉-6-基)甲基氨基] -2-thenoyl] -L-谷氨酸(7),第一个报道的噻吩类似物合成了5-氯-5,8-二叠氮基草酸,并测试了其为培养物中肿瘤细胞生长的抑制剂。将4-氯-5-甲基靛红(10)逐步转化为2-氨基-5-甲基-6-氯苯甲酸甲酯(22)和2-氨基-5-氯-3,4-二氢-6-甲基-4-氧喹唑啉(19)。进行2-氨基的苯甲酰化,然后进行NBS溴化,与N-(5-氨基-2-thenoyl)-L-谷氨酸二叔丁基缩合(28),并用氨和TFA逐步裂解保护基屈服了。用乙酸酐处理9,得到2,6-二甲基-5-氯代苯并[1,3-d]恶嗪-4-酮(31),其在与氨反应时,将NaOH转化为2,6-二甲