cis-Tetrahydrofuran-3,4-diol Structure as a Key Skeleton of New Protecting Groups Removable by Self-Cyclization under Oxidative Conditions
- 26 August 2006
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Organic Chemistry
- Vol. 71 (20), 7668-7677
- https://doi.org/10.1021/jo061006v
Abstract
A variety of carbonate-type acyl groups having a cis-tetrahydrofuran-3,4-diol (1,4-anhydroerythritol) backbone structure and a TrS or MMTrS group have been examined as new “protected” protecting groups of the 5‘-hydroxyl group of nucleosides. These acyl groups were designed in a manner where they could be deprotected by I2-promoted removal of the TrS or MMTrS group followed by self-cyclization involving an intramolecular attack of the once-generated neighboring hydroxyl group on the acyl carbon. It turned out that these acyl groups could be introduced into the 5‘-hydroxyl group of a 3‘-O-protected thymidine derivative by use of the corresponding acyl imidazolides or 4-nitrophenyl esters as well as by reaction with carbonyldiimidazole or 4-nitrophenyl chloroformate. Among the acyl groups tested, it was found that the CTFOC group could be easily introduced into the 5‘-hydroxyl group of 3‘-masked deoxyribonucleoside derivatives and rapidly removed under mild conditions using iodine.Keywords
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