93134-41-9Relevant articles and documents
Enzymatic parallel kinetic resolution of mixtures of d / l 2′-deoxy and ribonucleosides: An approach for the isolation of β- L -nucleosides
Martinez-Montero, Saul,Fernandez, Susana,Sanghvi, Yogesh S.,Gotor, Vicente,Ferrero, Miguel
body text, p. 6605 - 6613 (2010/11/17)
We have developed a lipase-catalyzed parallel kinetic resolution of mixtures of β-d/l-nucleosides. The opposite selectivity during acylation exhibited by Pseudomonas cepacia lipase (PSL-C) with β-d- and β-l-nucleosides furnished acylated compounds that have different R f values. As a consequence, isolation of both products was achieved by simple column chromatography. Computer modeling of the transition-state analogues during acylation of β-d- and β-l-2′-deoxycytidine with PSL-C was carried out to explain the high selectivity. PSL-C favored the 3′-O-levulination of the β-d enantiomer, whereas the 5′-OH group was acylated in 2′-deoxy-β-l-cytidine. In both cases, the cytosine base was placed in the alternate hydrophobic pocket of PSLs substrate-binding site, where it can form extra hydrogen bonds (in addition to the five essential catalytically relevant hydrogen bonds) that stabilize these intermediates catalyzing the selective acylation of β-d/l-nucleosides.
2,2,5,5-Tetramethylpyrrolidin-3-one-1-sulfinyl group for 5′-hydroxyl protection of deoxyribonucleoside phosphoramidites in the solid-phase preparation of DNA oligonucleotides
Marchan, Vicente,Cieslak, Jacek,Livengood, Victor,Beaucage, Serge L.
, p. 9601 - 9610 (2007/10/03)
Several nitrogen-sulfur reagents have been investigated as potential 5′-hydroxyl protecting groups for deoxyribonucleoside phosphoramidites to improve the synthesis of oligonucleotides on glass microarrays. Out of the nitrogen-sulfur-based protecting grou
Novel enzymatic synthesis of levulinyl protected nucleosides useful for solution phase synthesis of oligonucleotides
Garcia, Javier,Fernandez, Susana,Ferrero, Miguel,Sanghvi, Yogesh S.,Gotor, Vicente
, p. 3533 - 3540 (2007/10/03)
An efficient synthesis of 3′- and 5′-O-levulinyl-2′- deoxy- and 2′-O-alkylribonucleosides has been developed from appropriate nucleosides by enzyme-catalyzed regioselective acylation in organic solvents. Several lipases were screened in combination with a
Building blocks for the solution phase synthesis of oligonucleotides: Regioselective hydrolysis of 3′,5′-di-O-levulinylnucleosides using an enzymatic approach
Garcia, Javier,Fernandez, Susana,Ferrero, Miguel,Sanghvi, Yogesh S.,Gotor, Vicente
, p. 4513 - 4519 (2007/10/03)
A short and convenient synthesis of 3′- and 5′-O-levulinyl-2′-deoxynucleosides has been developed from the corresponding 3′,5′-di-O-levulinyl derivatives by regioselective enzymatic hydrolysis, avoiding several tedious chemical protection/deprotection steps. Thus, Candida antartica lipase B (CAL-B) was found to selectively hydrolyze the 5′-levulinate esters, furnishing 3′-O-levulinyl-2′-deoxynucleosides 3 in >80% isolated yields. On the other hand, immobilized Pseudomonas cepacia lipase (PSL-C) and Candida antarctica lipase A (CAL-A) exhibit the opposite selectivity toward the hydrolysis at the 3′-position, affording 5′-O-levulinyl derivatives 4 in >70% yields. A similar hydrolysis procedure was successfully extended to the synthesis of 3′- and 5′-O-levulinyl-protected 2′-O-alkylribonucleosides 7 and 8. This work demonstrates for the first time application of commercial CAL-B and PSL-C toward regioselective hydrolysis of levulinyl esters with excellent selectivity and yields. It is noteworthy that protected cytidine and adenosine base derivatives were not adequate substrates for the enzymatic hydrolysis with CAL-B, whereas PSL-C was able to accommodate protected bases during selective hydrolysis. In addition, we report an improved synthesis of dilevulinyl esters using a polymer-bound carbodiimide as a replacement for dicyclohexylcarbodiimide (DCC), thus considerably simplifying the workup for esterification reactions.
Synthesis of oligonucleotides
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, (2008/06/13)
Synthetic processes are provided for the solution phase synthesis of oligonucleotides, especially phosphorothioate oligonucleotides, and intermediate compounds useful in the processes. Intermediates having structure (I) are prepared in accordance with preferred embodiments.
Process for the synthesis of oligomeric compounds
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, (2008/06/13)
Synthetic processes are provided wherein oligomeric compounds are prepared having phosphodiester, phosphorothioate, and phosphorodithioate covalent linkages. Also provided are synthetic intermediates useful in the processes.
Oligodeoxyribonucleotide phosphorothioates: Substantial reduction of (N- 1)-mer content through the use of trimeric phosphoramidite synthons
Eleuteri, Alessandra,Capaldi, Daniel C.,Cole, Douglas L.,Ravikumar, Vasulinga T.
, p. 475 - 483 (2007/10/03)
Use of fully protected trimeric phosphoramidite synthons in the synthesis of oligonucleotide phosphorothioate shows a substantial reduction (>85%) in (n-1)-mer content as compared to oligomers synthesized through coupling of standard phosphoramidite monom
Oligomeric phosphite, phosphodiester, Phosphorothioate and phosphorodithioate compounds and intermediates for preparing same
-
, (2008/06/13)
Synthetic processes are provided wherein oligomeric compounds are prepared having phosphodiester, phosphorothioate, and phosphorodithioate covalent linkages. Also provided are synthetic intermediates useful in such processes.
On the formation of longmers in phosphorothioate oligodeoxyribonucleotide synthesis
Krotz, Achim H.,Klopchin, Patrick G.,Walker, Kathleen L.,Srivatsa, G. Susan,Cole, Douglas L.,Ravikumar, Vasulinga T.
, p. 3875 - 3878 (2007/10/03)
The extent of longmer formation in phosphorothioate oligodeoxyribonucleotide synthesis through amidite chemistry on solid support depends on base composition, contact time and acidity of the promoter used for activation of the phosphoramidite. A longmer f
Improvements in Oligodeoxyribonucleotide Synthesis: Methyl N,N-Dialkylphosphoramidite Dimer Units for Solid Support Phosphite Methodology
Kumar, G.,Poonian, M.S.
, p. 4905 - 4912 (2007/10/02)
Two procedures for the synthesis of methyl N,N-dialkylphosphoramidite dinucleotides (dimer units) compatible with the current solid support phosphite methodology of oligodeoxynucleotide synthesis are described for the first time.In the first procedure a c