Benzoic acid (2R,3R,4R,6S)-4-((2R,3S,4S,5R,6R)-4,5-bis-benzyloxy-6-methyl-3-phenylselanyl-tetrahydro-pyran-2-yloxy)-6-methoxy-2,4-dimethyl-tetrahydro-pyran-3-yl ester 以92%的产率得到(2R,3R,4R,6S)-4-((2R,3S,4S,5R,6R)-4,5-Bis-benzyloxy-6-methyl-3-phenylselanyl-tetrahydro-pyran-2-yloxy)-6-methoxy-2,4-dimethyl-tetrahydro-pyran-3-ol