methyl (3,6-di-O-acetyl-2-azido-2,4-dideoxy-4-(1,2-dihydroxypropyl)-α-D-glucopyranosyl)-(1-4)-(methyl 2-O-acetyl-3-O-benzyl-α-L-idopyranosyluronate)-(1-4)-(6-O-acetyl-3-O-benzyl-2-benzyloxycarbonylamino-2-deoxy-α-D-glucopyranoside) 、
苯甲醛二甲缩醛 在
camphor-10-sulfonic acid 作用下,
以
乙腈 为溶剂,
反应 1.5h,
以74%的产率得到methyl (3,6-di-O-acetyl-2-azido-2,4-dideoxy-4-(5-methyl-2-phenyl-1,3-dioxolan-4-yl)-α-D-glucopyranosyl)-(1-4)-(methyl 2-O-acetyl-3-O-benzyl-α-L-idopyranosyluronate)-(1-4)-(6-O-acetyl-3-O-benzyl-2-benzyloxycarbonylamino-2-deoxy-α-D-glucopyranoside)