5-methoxycarbonylpentyl 2-O-(2,3,4-tri-O-benzoyl-β-D-xylopyranosyl)-β-D-mannopyranoside 、
苯甲醛二甲缩醛 在
camphor-10-sulfonic acid 作用下,
以
乙腈 为溶剂,
以89%的产率得到(2S,3R,4S,5R)-2-(((2R,4aR,6R,7S,8S,8aS)-8-hydroxy-6-((6-methoxy-6-oxohexyl)oxy)-2-phenylhexahydropyrano[3,2-d][1,3]dioxin-7-yl)oxy)tetrahydro-2H-pyran-3,4,5-triyl tribenzoate