2,3,4-tri-O-(4-methoxybenzyl)-α-L-fucopyranosyl chloride 、 Acetic acid (2R,3S,4R,5R,6S)-3-acetoxy-6-((2R,3S,4R,5R,6R)-4-acetoxy-5-acetylamino-6-azido-2-hydroxymethyl-tetrahydro-pyran-3-yloxy)-2-acetoxymethyl-5-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)-tetrahydro-pyran-4-yl ester 在
四丁基溴化铵 作用下,
以68%的产率得到