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. 1987 Dec 10;15(23):9921–9932. doi: 10.1093/nar/15.23.9921

An approach to the stereoselective synthesis of Sp-dinucleoside phosphorothioates using phosphotriester chemistry.

R Cosstick 1, D M Williams 1
PMCID: PMC306540  PMID: 3480505

Abstract

An approach to the stereoselective synthesis of Sp- dinucleoside phosphorothioates has been investigated which utilizes phosphotriester chemistry. The stereoselectivity of internucleotide bond formation between N4-benzoyl-5'-O-(4,4'-dimethoxytrityl)-2'-deoxycytidine-3'-O-(S2-cyano-e thyl) phosphorothioate (3) and 3'-O-acetylthymidine has been studied using either mesitylenesulphonyl-5-(pyridin-2-yl)tetrazole (MSPy) or 1-mesitylenesulphonyl-3-nitro-1,2,4-triazole (MSNT) as the activating agent. The removal of the cyanoethyl group from the protected dinucleoside phosphorothioate has been studied, and conditions are reported which provide rapid deprotection without concomittant desulphurisation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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