3-O-allyloxycarbonyl-6-O-benzyl-2-deoxy-4-O-(1,5-dihydro-3-oxo-3λ5-3H-2,4,3-benzodioxaphosphepin-3-yl)-2-(2,2,2-trichloroethoxycarbonylamino)-D-glucopyranosyl trichloroacetimidate 、 3-(4-{4-[(2R,3S,4R,5R,6S)-6-Allyloxy-5-(9H-fluoren-9-ylmethoxycarbonylamino)-4-hydroxy-2-hydroxymethyl-tetrahydro-pyran-3-yloxymethyl]-phenylcarbamoyl}-butyrylamino)-propionic acid 4-(5-ethyl-2,4,6-trioxo-hexahydro-pyrimidin-5-ylmethyl)-benzyl ester 在
三氟甲磺酸三甲基硅酯 、 4 A molecular sieve 作用下,
以
二氯甲烷 为溶剂,
以88%的产率得到[4-[(5-ethyl-2,4,6-trioxo-1,3-diazinan-5-yl)methyl]phenyl]methyl 3-[[5-[4-[[(2R,3S,4R,5R,6S)-5-(9H-fluoren-9-ylmethoxycarbonylamino)-4-hydroxy-2-[[(2R,3R,4R,5S,6R)-5-[(3-oxo-1,5-dihydro-2,4,3lambda5-benzodioxaphosphepin-3-yl)oxy]-6-(phenylmethoxymethyl)-4-prop-2-enoxycarbonyloxy-3-(2,2,2-trichloroethoxycarbonylamino)oxan-2-yl]oxymethyl]-6-prop-2-enoxyoxan-3-yl]oxymethyl]anilino]-5-oxopentanoyl]amino]propanoate