by chromatography. Compound 4 was also prepared by the reaction of 1 with cold acetaldehyde diethyl acetal containing a trace of acetic acid, and its alpha anomer (5) by the reaction of 1 with boiling acetaldehyde diethyl acetal containing a trace of acetic acid. Each deacetylated D-glucoside was cleaved by the corresponding D-glucosidase, to yield D-glucose and either acetaldehyde (from deacetylated
乙基
乙烯基醚与2,3,4,6-四-O-乙酰基-β-
D-吡喃葡萄糖(1)在Hg(OAc)2和
甲苯-对
磺酸为催化剂的反应下产生乙酰化
乙烯基,
1-乙氧基乙基和1-乙氧基丁-3-烯基糖苷的比例不同。结晶1-乙氧基丁-3-烯基2,3,4,6-四-O-乙酰基-β-
D-吡喃葡萄糖苷(2),
乙烯基2,3,4,6-四-O-乙酰基-α-D-通过色谱法分离了
吡喃
葡萄糖苷(3)和
2-乙氧基乙基2,3,4,6-四-O-乙酰基-β-
D-吡喃葡萄糖苷(4)。化合物4还通过使1与含有痕量
乙酸的冷
乙醛二乙基缩醛反应,以及由其1与含有痕量
乙酸的沸腾
乙醛二
乙缩醛反应来制备其α端基异构体(5)。每个脱乙酰基化的
D-葡萄糖苷均被相应的
D-葡萄糖苷酶裂解,