Convergent synthesis of 2?,3?-dideoxy-3?-mercapto nucleosides ? Potential anti-HIV agents
作者:A. A. El-Barbary、A. I. Khodair、E. B. Pedersen、C. Nielsen
DOI:10.1007/bf00812717
日期:——
Methyl 3-benzoylthio-5-O-tert-butyldiphenylsilyl-2,3-dideoxy-beta-D- erythro-pentofuranoside (4) and its corresponding alpha anomer 5 were synthesized in four steps from 2-deoxy-D-ribose and used as substrates for the synthesis of nucleosides by condensation with silylated thymidine and N-6-isobutyryladenine. The nucleosides were deprotected by treatment with Bu(4)NF in THF followed by reaction with MeONa in MeOH to give 3'-deoxy-3'-mercaptothymidine (8), 2',3'-dideoxy-3'mercaptoadenosine (15) and its corresponding alpha anomer 16. In the latter reactions it was important to use degassed solvents to minimize formation of the corresponding disulfides of purine nucleosides. Using Bu(4)NF, without subsequent reaction with MeONa in the deprotection reaction, resulted in intermolecular transesterification reactions.
2‘,3‘-Dideoxy-3‘-thionucleoside Triphosphates: Syntheses and Polymerase Substrate Activities
作者:Meena、Mui Sam、Kathryn Pierce、Jack W. Szostak、Larry W. McLaughlin
DOI:10.1021/ol070147w
日期:2007.3.1
All four 2',3'-dideoxy-3'-thio-nucleosides (ddtNTPs) function as substrates for the Y410F mutant of Deep Vent (exo-) DNA polymerase. Not only are the ddtNTPs incorporated to form the N + 1 product, but further elongations are observed in which the key step is attack of the 3'-thiol on the 5'-triphosphate. Although other polymerases are likely to differ in their use of the ddtNTPs, there does not appear