Disclosed herein are processes for preparing glucopyranosyloxypyrazole derivatives. In particular, the present invention relates to glucopyranosyloxypyrazole derivatives having SGLT2 inhibitory activity and processes and intermediates for preparing the same.
Highly Selective Primary Alkoxycarboxylation and Esterification of Unprotected Pyranose Derivatives Mediated by Scandium(III) Triflate Catalysis
作者:Michael S. McClure、Malcolm B. Berry、Darren Caine、Claire Crawford、Brian C. Crump、Bobby N. Glover、Sandeep B. Kedia、Alan Millar、Mark B. Mitchell、Christopher J. Nichols、Daniel E. Patterson、Jeremiah Powers
DOI:10.1002/ejoc.201200261
日期:2012.7
A highlyselective method for the alkoxycarboxylation and acylation of primary alcohols of pyranosederivatives is described. The reaction is high yielding and proceeds under mild conditions with 0.15–1 mol-% Sc(OTf)3 used in combination with anhydrides or pyrocarbonates at 40–50 °C. Selectivities observed for alkoxycarboxylation of unprotectedpyranosederivatives are > 95 %, and this constitutes