PMID: 25970636
Kadina AP, Kashemirov BA, Oertell K, Batra VK, Wilson SH, Goodman MF, McKenna CE
Two Scaffolds from Two Flips: (alpha,beta)/(beta,gamma) CH2/NH "Met-Im" Analogues of dTTP.
Org Lett. 2015 Jun 5;17(11):2586-9. doi: 10.1021/acs.orglett.5b00799. Epub 2015, May 13.
Novel alpha,beta-CH2 and beta,gamma-NH (1a) or alpha,beta-NH and beta,gamma-CH2 (1b) "Met-Im" dTTPs were synthesized via monodemethylation of triethyl-dimethyl phosphorimido-bisphosphonate synthons (4a, 4b), formed via a base-induced [1,3]-rearrangement of precursors (3a, 3b) in a reaction with dimethyl or diethyl phosphochloridate. Anomerization during final bromotrimethylsilane (BTMS) deprotection after Mitsunobu conjugation with dT was avoided by microwave conditions. 1a was 9-fold more potent in inhibiting DNA polymerase beta, attributed to an NH-group interaction with R183 in the active site.