Journal
TETRAHEDRON LETTERS
Volume 52, Issue 28, Pages 3625-3629Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2011.05.020
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A variety of commercially available alcohols were converted to their bis-(tert-butyl) protected monophosphate pro-drugs. The improved procedure uses the unique combination of imidazole center dot hydrochloride and imidazole as the activator to suppress the formation of undesired phosphonate by-product frequently encountered with the bis-(tert-butyl) phosphoramidite reagents. The new activation procedure eliminates the need to use excess reagents. (C) 2011 Elsevier Ltd. All rights reserved.
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