Either the alpha- or gamma-carboxyl group of the glutamic acid moiety of N-[4-[3-(2,4-diamino-7H-pyrrolo[2,3-d]pyrimidin-5- yl)propyl]benzoyl]-L-glutamic acid (1b, TNP-351) and its related compound (1a) was replaced with a 1H-tetrazole ring, and the inhibitory effects of the resulting compounds on dihydrofolate reductase (DHFR) and the growth of murine fibrosarcoma Meth A cells were examined. The gamma-tetrazole
N- [4- [3-(2,4-二
氨基-7H-
吡咯并[2,3-d]
嘧啶-5-基)丙基]苯甲酰基]的谷
氨酸部分的α-或γ-羧基用
1H-四唑环取代-
L-谷氨酸(1b,
TNP-351)及其相关化合物(1a),所得化合物对二氢叶酸还原酶(DHFR)和鼠类纤维肉瘤Meth A的生长具有抑制作用检查细胞。γ-
四唑类似物(2)被发现比
TNP-351更有效的DHFR
抑制剂,并强烈抑制Meth A细胞的生长。另一方面,尽管α-
四唑类似物(3)的DHFR抑制活性与
TNP-351相当,但它们对Meth A细胞的活性却低得多。这些发现表明,α-羧基在通过减少的叶酸载体有效吸收中起着重要作用,