a 55: 45 separable mixture of diastereoisomeric alcohols, the major isomer affording the acetate 16. The minor diastereoisomer could be recycled to the required isomer by an oxidation-reduction seq~ ence.'~ Debenzylation with boron trichloride-dimethyl sulfide complexZo in dichloromethane at room temperature unmasked the secondary alcohol 17, which was cleanly inverted to the bromo derivative 18 with DIPHOS-Br2 in remarkably ...
[Burton, Jonathan W.; Clark, J. Stephen; Derrer, Sam; Stork, Thomas C.; Bendall, Justin G.; Holmes, Andrew B. Journal of the American Chemical Society, 1997 , vol. 119, # 32 p. 7483 - 7498]
