deacetylated product from 3 in 75% yield. The structure was confirmed by u.v., i.r., n.m.r., and mass spectra. Attempted cyclization to prepare manno- and talopyranodihydrobenzooxazine and talopyranodihydrobenzothiazine from the corresponding aromatic glycosides and thioglycosides failed under similar conditions. The n.m.r. spectra of some o -substituted phenyl β- D -galactopyranosides and 1-thio-β- D -galactopyranosides
                                    摘要由相应的
溴化物经邻
氨基
苯硫醇处理,制得邻
氨基苯酚3,4,6-三邻乙酰基-2-邻甲磺酰基-1-
硫代-β-
D-吡喃葡萄糖苷(3)。将
乙酸钾和
乙酸钠的混合物与3在
乙醇水溶液中回流,以38%的产率得到3,4,6-三-O-乙酰基-D-甘露
吡喃并[顺式-1,2-b]二氢苯并
噻嗪(14)。化合物14也可以从相应的脱乙酰产物中以35%的产率从3获得。通过紫外,红外,核磁共振和质谱证实了该结构。尝试环化以从相应的芳族糖苷和
硫代糖苷制备
甘露聚糖和塔洛
吡喃二氢苯并恶嗪和塔洛
吡喃二氢苯并
噻嗪在相似条件下失败。讨论了一些邻位取代的苯基β-D-
吡喃半
乳糖苷和
1-硫代-β-D-吡喃半乳糖苷的核磁共振谱。