乙酸酐 、 [(1R,2S,3R,4R,5R)-3-[(2R,3R,4R,5S,6R)-3-Acetylamino-6-(acetylamino-methyl)-4,5-dihydroxy-tetrahydro-pyran-2-yloxy]-2-((2S,3R,4S,5R)-3,4-dihydroxy-5-hydroxymethyl-tetrahydro-furan-2-yloxy)-6,8-dioxa-bicyclo[3.2.1]oct-4-yl]-carbamic acid benzyl ester 在
吡啶 作用下,
生成