乙酸酐 、
N-<2-O-(benzyl 2-acetamido-6-O-acetyl-2,3-dideoxy-α-D-glucopyranoside-3-yl)-(R)-lactoyl>-L-alanylglycine methyl ester 在
吡啶 作用下,
以72%的产率得到{(S)-2-[(R)-2-((2R,3S,4R,5R,6S)-3-Acetoxy-2-acetoxymethyl-5-acetylamino-6-benzyloxy-tetrahydro-pyran-4-yloxy)-propionylamino]-propionylamino}-acetic acid methyl ester