Benzotriazolyl-N-oxytris(dimethylamino)phosphonium hexafluorophosphate (‘Le BOP’ reagent) in combination with imidazole provides a very mild system for selective esterification of polyhydroxy-compounds. An example is given showing an improved selectivity towards position 2 of trehalose, leading to new derivatives of ‘Cord-Factor.’
Y. Chapleur, B. Castro and R. Toubiana, J. Chem. Soc., Perkin Trans. 1, 1980, 1940 DOI: 10.1039/P19800001940
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