(-)-7-Oxabicyclo[2.2.1]hept-5-en-2-one has been converted to (-)-6-exo-[(tert-butyl)dimethylsilyloxy]-7-endo-benzyloxy-8-oxabicyclo[3.2.1]oct-3-en-2-one and methyl 3,5-di-O-acetyl-2,6-anhydro-4-O-benzoyl-D- glycero-D-galacto-heptouronate that were condensed with Me2AlSPh into a single aldol which was transformed into a beta-D-ManAp-CH(OAc)(1-->3)-alpha-L-GulAp-CH(SEt)(2) derivative. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.
(-)-7-氧杂
双环[2.2.1]庚-5-烯-2-酮已被转化为 (-)-6-外-[(叔丁基)二甲基
硅氧基氧]-7-内-苯基氧-8-氧杂双环[3.2.1]辛-3-烯-2-酮以及甲基 3,5-二-O-乙酰基-2,6-脱
水-4-O-苯甲酰基-D-
甘油-
D-半乳糖庚酸酯,它们与 Me₂Al
SPh 缩合形成一个单一的 aldol,进而转化为 β-
D-甘露糖基epar-CH(OAc)(1→3)-α-L-古糖基epar-CH(
SEt)(2) 衍
生物。(C) 1999 El
SEvier Science Ltd. 保留所有权利。