The combination of 1-benzenesulfinyl piperidine (BSP) and trifluoromethanesulfonic anhydride (Tf(2)O) forms a new, powerful, metal-free thiophile that can readily activate both armed and disarmed thioglycosides, via glycosyl triflates, in a matter of minutes at -60 degrees C in dichloromethane, in the presence of 2,4,6-tri-tert-butylpyrimidine (TTBP). The glycosyl triflates are rapidly and cleanly converted to glycosides, upon treatment with alcohols, in good yield and selectivity.
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Crich et al. (2001) studied this question.
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