(2R)-2-[(3S,5S,6S,8S,10S,13S,14S,17S)-3-[tert-butyl(dimethyl)silyl]oxy-6-hydroxy-10,13-dimethyl-2,3,4,5,6,7,8,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl]-2-hydroxy-6-methylheptan-3-one 、 2,3,4-tri-O-benzoyl-β-D-fucopyranosyl-(1→2)-(3,4-di-O-benzyl-6-deoxy-β-D-glucopyranosyl)-(1→4)-[(2,4-di-O-benzoyl-6-deoxy-3-O-methyl-β-D-glucopyranosyl)-(1→2)]-(3-O-benzoyl-β-D-xylopyranosyl)-(1→3)-2,4-di-O-benzoyl-6-deoxy-D-glucopyranosyl ortho-hexynylbenzoate 在
trifluoromethanesulfonyloxy(triphenylphosphine)gold(I) 作用下,
以
二氯甲烷 为溶剂,
以80%的产率得到(20R)-3β-tert-butyldimethylsilyloxy-20-hydroxy-5α-cholest-9(11)-en-22-on-6-yl O-(2,3,4-tri-O-benzoyl-β-D-fucopyranosyl)-(1→2)-(3,4-di-O-benzyl-6-deoxy-β-D-glucopyranosyl)-(1→4)-[(2,4-di-O-benzoyl-6-deoxy-3-O-methyl-β-D-glucopyranosyl)-(1→2)]-(3-O-benzoyl-β-D-xylopyranosyl)-(1→3)-2,4-di-O-benzoyl-6-deoxy-β-D-glucopyranoside