Abstract:
:A comparative study of aryl phosphoramidate and aryl thiophosphoramidate derivatives of 2',3'-didehydro-2',3'-dideoxythymidine (d4T) was performed. The study focused on the nature of the substituents and the influence of a thiophosphoramidate in the structure of these derivatives. The rate of alkaline hydrolysis of these two types of d4T derivatives indicated that replacement of oxygen with sulfur decreases the rate of hydrolysis by twofold. Additionally, the activation energy (E(a)) for the sulfur analogs is comparatively higher than that of the oxygen analogs. Notably, an intermediate was formed in the hydrolysis reaction of the sulfur analogs of d4T that was absent in the case of the oxygen analog, and the tentative structure of the intermediate was proposed based on LC/mass spectroscopy data. Using both HPLC and (31)P-NMR techniques, we identified the hydrolysis product of the phosphoramidate derivatives and were able to show in in vitro studies that porcine liver esterase can hydrolyze the methyl ester portion of the phosphoramidate derivatives. Aryl phosphoramidate derivatives of d4T were 1000-fold more active than the corresponding aryl thiophosphoramidate derivatives, indicating that the energy of activation of hydrolysis of these phosphoramidate derivatives plays a significant role in their biological potency.
journal_name
Eur J Med Chemjournal_title
European journal of medicinal chemistryauthors
Venkatachalam TK,Yu G,Samuel P,Qazi S,Pendergrass S,Uckun FMdoi
10.1016/j.ejmech.2004.04.002subject
Has Abstractpub_date
2004-08-01 00:00:00pages
665-83issue
8eissn
0223-5234issn
1768-3254pii
S0223523404000959journal_volume
39pub_type
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