2-Nitro analogues of adenosine and 1-deazaadenosine: synthesis and binding studies at the adenosine A1, A2A and A3 receptor subtypes
摘要:
The influence of nitro substituents on the properties of adenosine and 1-deazaadenosine was studied. Combination of a nitro group at the 2-position with several N-6 substituents such as cyclopentyl and m-iodobenzyl gave a series of analogues with good adenosine receptor affinity, showing directable selectivity for the A(1), A(2A) and A(3) adenosine receptor subtypes. (C) 2000 Elsevier Science Ltd. All rights reserved.
Glycosylation reactions of 6-nitro-1,3-dideazapurine and 6-nitro-1-deazapurine
作者:Theresa A. Devlin、Emmanuelle Lacrosaz-Rouanet、Duc Vo、David J. Jebaratnam
DOI:10.1016/0040-4039(95)00098-w
日期:1995.3
In glycosylations utilizing SnCl4 activation or S(N)2 displacement of the alpha-chlorosugar, two closely related pulines, namely 6-nitro-1,3-dideazapurine 1 and 6-nitro-1-deazapurine 2, give different distributions of isomeric products.
CRISTALLI, GLORIA;FRANCHETTI, PALMARISA;GRIFANTINI, MARIO;VITTORI, SAURO;+, J. MED. CHEM., 30,(1987) N 9, 1686-1688
To obtain selectively functionalized 1-deazapurine nucleosides, the nitrating mixture tetrabutylammonium nitrate/trifluoroacetic anhydride (TBAN/TFAA) has been studied. This mixture demonstrated several merits: the use of an easy to handle reagent, mild reaction conditions and high selectivity for nitration in the pyridine ring. Nitration occurred at the alpha or beta-position with respect to the pyridine nitrogen atom, depending on the substituents in the ring. Electron withdrawing substituents in the pyridine ring showed a positive effect on this nitration. (C) 2000 Elsevier Science Ltd. All rights reserved.