Efficient Mitsunobu Reactions with <i>N</i>-Phenylfluorenyl or <i>N</i>-Trityl Serine Esters
作者:Robert J. Cherney、Li Wang
DOI:10.1021/jo951958t
日期:1996.1.1
Analogues of <i>N</i><sup>α</sup>-(4-Amino-4-deoxypteroyl)-<i>N</i><sup>δ</sup>-hemiphthaloyl-<scp>l</scp>-ornithine (PT523) Modified in the Side Chain: Synthesis and Biological Evaluation
作者:Andre Rosowsky、Chitra M. Vaidya、Henry Bader、Joel E. Wright、Beverly A. Teicher
DOI:10.1021/jm9606453
日期:1997.1.1
for methotrexate. In a clonogenic assay against SCC25 human squamous cell carcinoma cells, the IC50 values of 11 and 12 were 2.9 and 72 nM, as compared with 0.3 nM for PT523 and 27 nM for methotrexate. Thus, activity was decreased by moving the aromatic carboxyl group in PT523 to the meta position and was further diminished by moving it to the para position. The IC50 of the halogenated analogue 13 against
通过简单的抗叶酸化学方法合成了四个迄今未描述的Nα-(4-氨基-4-脱氧蝶酰基)-Nδ-半邻苯二甲酰基-L-鸟氨酸的侧链类似物(PT523,4),并与它们的性质进行了比较。 PT523和两种相关化合物,其目的是确定半邻苯二甲酰基-L-鸟氨酸对这种新型不可聚谷氨酸氨基蝶呤类似物的优异体外抗肿瘤活性的作用。Nα-(4-氨基-4-deoxypteroyl)-Nβ-半邻苯二甲酰基-L-2,3-二氨基丙酸(10)和Nα-(4-氨基-4-deoxypteroyl)-Nγ-的IC50值针对培养的A549人非小细胞肺癌细胞的半邻苯二甲酰基-L-2,4-二氨基丁酸(9)分别为23和22 nM,而PT523和Nα-(4-氨基-4-脱氧蝶酰基)- N epsilon-hemiphthaloyl-L-赖氨酸(8)为1。3和5.2 nM。相对于美国国家癌症研究所用于筛选新药的细胞系,还发现相对于PT523而言,体外