452335-22-7Relevant academic research and scientific papers
Recent advances in the synthesis of conformationally locked nucleosides and their success in probing the critical question of conformational preferences by their biological targets
Choi, Yongseok,Moon, Hyung R.,Yoshimura, Yuichi,Marquez, Victor E.
, p. 547 - 557 (2003)
The present work describes some recent approaches to the syntheses of three classes of locked-North nucleosides: β-D-ribo-, β-D-deoxyribo-, and β-D-dideoxy-ribonucleosides. The method developed for the latter class permitted access to a novel bicyclo[3.1.
Antiaggregatory activity in human platelets of potent antagonists of the P2Y1 receptor
Cattaneo, Marco,Lecchi, Anna,Ohno, Michihiro,Joshi, Bhalchandra V.,Besada, Pedro,Tchilibon, Susanna,Lombardi, Rossana,Bischofberger, Norbert,Harden, T. Kendall,Jacobson, Kenneth A.
, p. 1995 - 2002 (2007/10/03)
Activation of the P2Y1 nucleotide receptor in platelets by ADP causes changes in shape and aggregation, mediated by activation of phospholipase C (PLC). Recently, MRS2500 (2-iodo-N6-methyl-(N)-methanocarba- 2′-deoxyadenosine-3′,5′-bi
Enantioselective synthesis of bicyclo[3.1.0]hexane carbocyclic nucleosides via a lipase-catalyzed asymmetric acetylation. Characterization of an unusual acetal byproduct.
Yoshimura, Yuichi,Moon, Hyung R,Choi, Yongseok,Marquez, Victor E
, p. 5938 - 5945 (2007/10/03)
The bicyclo[3.1.0]hexane scaffold can lock the conformation of a carbocyclic nucleoside into one of the two antipodal (north or south) conformations typical of conventional nucleosides that normally exist in a rapid, two-state equilibrium in solution. In a recent brief communication, we reported a practical method to access the requisite bicyclo[3.1.0]hexane pseudosugar for the north antipode via an intramolecular olefin-ketocarbene cycloaddition. The most attractive features of this synthesis was that a relatively complex synthon was obtained from simple and inexpensive starting materials and that the resulting racemic mixtures of purine nucleosides could be successfully resolved by adenosine deaminase (ADA) hydrolysis. In this work, we describe the development of a more general, lipase-catalyzed double-acetylation reaction, which could successfully resolve an earlier precursor, 4-(tert-butyldiphenylsilamethoxy)-1-(hydroxymethyl)bicyclo[3.1.0]hexan-2-ol [(+/-)-7], into enantiomerically pure (+)-diacetate 8 and (-)-monoacetate 9. The former diacetate was converted to the conformationally locked (north)-carbocyclic guanosine (+)-17 identical to the one obtained previously by ADA resolution. The present method represents a more general and efficient process applicable to the synthesis of all classes of (north) bicyclo[3.1.0]hexane nucleosides, including pyrimidine analogues. During the lipase-catalyzed resolution, we were able to demonstrate the presence of an unusual acetal-forming reaction that consumed small amounts of the unreactive monoacetate (-)-9. This side reaction was also enzyme-catalyzed and was triggered by the byproduct acetaldehyde generated during the reaction.
