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Synthesis 2010(22): 3827-3834
DOI: 10.1055/s-0030-1258270
DOI: 10.1055/s-0030-1258270
PAPER
© Georg Thieme Verlag
Stuttgart ˙ New York
A New Protocol for Selective Cleavage of Acyl Protecting Groups in 2′-O-Modified 3′,5′-O-(Tetraisopropyldisiloxane-1,3-diyl)ribonucleosides
Further Information
Received
9 August 2010
Publication Date:
28 September 2010 (online)
Publication History
Publication Date:
28 September 2010 (online)
Abstract
The stability of tetraisopropyldisiloxane-1,3-diyl (TIPDS) protection in nucleosides in ammonia/amine solutions in methanol and ethanol was studied. In ammonia-methanol at ambient temperature significant partial cleavage of TIPDS was observed. When ethanol was used instead of methanol this undesired side reaction was completely inhibited. It was found that commercially available 8 M methylamine-ethanol solution is the reagent of choice for selective deacylation of N- or/and O-acyl protected nucleosides without notable cleavage of 3′,5′-TIPDS group. Several examples of the developed protocol for the preparation 2′-O-modified nucleosides with overall high yields are presented.
Key words
nucleosides - blocking group stability - tetraisopropyldisiloxane-1,3-diyl - protecting group - N-deacylation - O-deacylation
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