The reaction of penta-O-benzoyl-d-glucopyranose with piperidine: characterization of the products isolated and study of the reaction mechanism
作者:Amelia E Salinas
DOI:10.1016/s0008-6215(99)00029-4
日期:1999.3
same reaction, it was found that N-benzoylpiperidine is formed at the expense of benzoyloxy-C-1, piperidinium benzoate arises mainly from benzoyloxy-C-2, and the benzoyloxy groups originally attached to C-3, C-4, and C-6 remain in the major product of the reaction. These results demonstrate that the first compound produced in the reaction is N-(3,4,6-tri-O-benzoyl-β- d -glucopyranosyl)piperidine, which
摘要五-O-苯甲酰基-d-吡喃葡萄糖与哌啶的反应生成N-(2,3,6-三-O-苯甲酰基-β-d-吡喃葡萄糖基)哌啶(44.1%),N-(2,4, 6-三-O-苯甲酰基-β-d-吡喃葡萄糖基)哌啶(1.5%),N-苯甲酰基哌啶和苯甲酸哌啶鎓(每摩尔底物约两种摩尔的两种产物)。当几个含有选择性地被14 C标记的苯甲酰氧基的五-O-苯甲酰基-d-吡喃葡萄糖进行同一反应时,发现以苯甲酰氧基-C-1为代价形成了N-苯甲酰基哌啶,苯甲酸哌啶主要来自苯甲酰氧基。 -C-2和最初连接到C-3,C-4和C-6的苯甲酰氧基保留在反应的主要产物中。这些结果表明,反应中产生的第一个化合物是N-(3,4,6-三-O-苯甲酰基-β-d-吡喃葡萄糖基)哌啶,无法分离,因为它经历了两个连续的苯甲酰迁移:从O-3迁移到O-2得到2,4,6-tri-O-苯甲酸酯,然后从O-4迁移到O-3得到2,3,6-三-O-苯甲酸酯。提出