乙酸酐 、 (4R,5R,6R)-5-[(2R,3S,4S,5S,6R)-3-Acetoxy-6-((S)-1,2-dihydroxy-ethyl)-4,5-dihydroxy-tetrahydro-pyran-2-yloxy]-6-((R)-1,2-diacetoxy-ethyl)-2,4-dihydroxy-tetrahydro-pyran-2-carboxylic acid methyl ester 在
吡啶 、
4-二甲氨基吡啶 、
溴化钛(IV) 作用下,
生成
O-(2,3,4,6,7-Penta-O-acetyl-L-glycero-α-D-manno-heptopyranosyl)-(1->5)-methyl-(4,5,7-tri-O-acetyl-3-desoxy-α-D-manno-2-octulopyranosylbromid)onat