Synthesis of 4-nitrophenyl β-d-fucofuranoside and β-d-fucofuranosyl-(1→3)-d-mannopyranose: modified substrates for studies on catalytic requirements of β-d-galactofuranosidase
作者:Alejandro Chiocconi、Carla Marino、Rosa M de Lederkremer
DOI:10.1016/s0008-6215(99)00241-4
日期:1999.1
of 4-nitrophenyl β- d -fucofuranoside ( 6 ) and β- d -fucofuranosyl-(1→3)- d -mannopyranose ( 10 ) are reported. These compounds, as analogues of galactofuranosides, were used for studying the influence of the hydroxyl group at C-6 in the interaction of the substrate with β- d -galactofuranosidase. For the synthesis of the fucofuranosides, 2,3,5-tri- O -benzoyl-6-bromo-6-deoxy- d -galactono-1,4-lactone
摘要报道了4-硝基苯基β-d-呋喃呋喃糖苷(6)和β-d-呋喃呋喃糖基-(1→3)-d-甘露吡喃糖(10)的合成。这些化合物作为半呋喃呋喃糖苷的类似物,用于研究C-6处羟基在底物与β-d-半乳糖呋喃糖苷酶相互作用中的影响。对于岩藻呋喃糖苷的合成,2,3,5-三-O-苯甲酰基-6-溴-6-脱氧-d-半内酯-1,4-内酯(1)是关键中间体,其在还原内酯后基团与二异戊基硼烷,异头羟基的乙酰化以及溴在C-6处的催化氢解反应产生了1- O-乙酰基-2,3,5-三-O-苯甲酰基-α,β-d-呋喃呋喃糖( 4),一种用于制备呋喃呋喃糖苷的方便衍生物。在SnCl 4存在下,将化合物4糖基化,或者用4-硝基苯酚制备6,或与2,5,6-三-O-苯甲酰基-d-甘露糖-1,4-内酯(7)一起通过糖基-醛内酯方法合成二糖10。为β-d-呋喃呋喃糖苷开发的合成途径既简单又有效。通过与来自倒青霉的外切β-d-半乳糖呋喃