Bis-cycloSal-d4T-monophosphates have been synthesized as potentially anti-HIV active "dimeric" prodrugs of 2',3'-dideoxy-2',3'-didehydrothymidine monophosphate (d4TMP). These pronucleotides display a mask-drug ratio of 1:2, a novelty in the field of pronucleotides. Both bis-cycloSal-d4TMP 6 and bis-5-methyl-cycloSal-d4TMP 7 showed increased hydrolytic stability as compared to their "monomeric" counterparts and a completely selective hydrolytic release of d4TMP. The hydrolysis pathway was investigated via P-31 NMR spectroscopy. Moreover, due to the steric bulkiness, compound 6 already displayed strongly reduced inhibitor potency toward human butyrylcholinesterase (BChE), while compound 7 turned out to be devoid of any inhibitory activity against BChE. Partial separation of the diastereomeric mixture of 6 revealed strong dependence of the pronucleotides' properties on the stereochemistry at the phosphorus centers. Both 6and 7 showed good activity against HIV-1 and HIV-2 in wild-type CEM cells in vitro. These compounds were significantly more potent than the parent nucleoside d4T 1in HIV-2-infected TK-deficient CEM cells, indicating an efficient TK-bypass.
METHOD FOR THE SOLID-PHASE BASED SYNTHESIS OF PHOSPHATE-BRIDGED NUCLEOSIDE CONJUGATES
申请人:UNIVERSITÄT HAMBURG
公开号:US20150361124A1
公开(公告)日:2015-12-17
A method for producing phosphate-bridged nucleoside conjugates, in particular poly- or oligonucleosides. In the method, an immobilized cyclosaligenyl derivative of a nucleoside, nucleotide, poly- or oligonucleotide, poly- or oligonucleoside, or an analog thereof, is synthesized, and the subsequent reaction with a nucleophile yields the desired phosphate-bridged nucleoside conjugate, which may subsequently be released from the solid phase.
Operationally Simple Regioselective 5′-Phosphorylation of Unprotected 5-Ethynyl-2′-deoxyuridine Analogues
作者:David H. Hilko、Laurent F. Bornaghi、Sally-Ann Poulsen
DOI:10.1071/ch19529
日期:——
straightforward methodology to regioselectively phosphorylate the 5′-OH group of unprotected nucleosides. We employ cyclosaligenyl phosphoramiditereagents together with pyridinium trifluoroacetate as activator, followed by in situ oxidation to prepare a panel of novel nucleoside-based chemical probes, ProLabel compounds 4–15. Alternative procedures for this transformation are available, but are limited