[(S)-1-Hydroxymethyl-3-((2S,3S,4R,5S,6R)-3,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-2-yl)-propyl]-carbamic acid 9H-fluoren-9-ylmethyl ester 以96%的产率得到(S)-2-(9H-Fluoren-9-ylmethoxycarbonylamino)-4-((2S,3S,4R,5S,6R)-3,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-2-yl)-butyric acid