我们已经开发出一种用于合成C-糖基化菲啶的有效方案。由K 2 S 2 O 8介导的呋喃酸和吡喃糖醛酸的氧化脱羧反应生成的四氢呋喃-4-基和五吡喃基-5-基遭受2-异氰基二苯基的攻击,随后发生均相芳族取代,从而提供多种C-糖基化的菲啶无需过渡金属即可获得令人满意的收率。该反应可耐受各种官能团,并能方便地合成复杂的基于寡糖的菲啶。已经制备了衍生自β-环糊精的C-糖基化菲啶,由于其灵活的构象,在医学和生物化学中可能具有潜力。
An Efficient Method for the Synthesis of A 1,6-Anhydro-α-D-Galactofuranose Derivative and its Application in the Synthesis of Oligosaccharides
摘要:
Synthesis of 1,6-anhydro-2,3,5-tri-O-benzoyl-beta-D-galactofuranose (3) has been achieved in good yield by stannic chloride catalysed ring closure of methyl 2,3,4-tri-O-benzoyl-6-O-benzyl-beta-D-galactofuranoside (1). The anhydro compound 3 was converted to the furanoside donors 6 and 7 with an easily removable O-6 acetyl group. The donors 6 and 7 were utilised for the synthesis of a di- and a trisaccharide containing beta-D-galactofuranosides.