作者:Ludwig Käsbeck、Horst Kessler
DOI:10.1002/jlac.199719970124
日期:1997.1
Convenient syntheses of the 2,3,4,6-tetra-O-benzylated and -allylated D-glucopyranoses 1 and 2 and the corresponding D-galactopyranoses 3 and 4 are described. The D-glucose derivatives 1 and 2 were obtained from inexpensive sucrose by peralkylation and subsequent acid hydrolysis. In this reaction sequence an alkylated D-fructofuranosyl cation is generated which was trapped by different nucleophiles
描述了2,3,4,6-四-O-苄基化和烯丙基化的D-吡喃葡萄糖1和2以及相应的D-吡喃半乳糖3和4的方便的合成。D-葡萄糖衍生物1和2是从廉价的蔗糖中通过过烷基化和随后的酸水解获得的。在该反应序列中,产生烷基化的D-果糖呋喃糖基阳离子,该阳离子被不同的亲核试剂捕获,得到4-苄氧基亚甲基糠醛(8)和烷基化的D-果糖苷7、8和10。另一方面,2,3,4,6-四-O-苄基-D-半乳糖3通过用N-溴代琥珀酰亚胺水溶液氧化裂解乙基2,3,4,6-四-O-苄基-1-硫代-α,β-D-吡喃半乳糖苷(11)来合成。通过对甲氧基苄基β-D-葡糖苷制备2,3,4,6-四-O-烯丙基-D-吡喃葡萄糖苷(2)的替代途径吸引力较小。然而,被用于的2,3,4,6-四-合成此路线ö -allyl- d半乳糖(4)。