Protecting group directed diversity during Mitsunobu cyclization of a carbohydrate derived diamino triol. Synthesis of novel bridged bicyclic and six-membered iminocyclitols
作者:Muthupandian Ganesan、Rahul Vilas Salunke、Nem Singh、Namakkal G. Ramesh
DOI:10.1039/c2ob27000e
日期:——
A novel protecting group directed diversity leading to the synthesis of bridged bicyclic and six-membered iminocyclitols from a common carbohydrate derived diamino triol under Mitsunobu conditions is reported. When the intramolecular cyclization of benzoyl derivative 16 was carried out under Mitsunobu conditions, an unprecedented one-pot domino intramolecular “cyclization–N → O benzoyl migration–cyclization”
据报道,在Mitsunobu条件下,由新颖的保护基指导的多样性导致由常见的碳水化合物衍生的二氨基三醇合成桥接的双环和六元亚氨基环醇。当在Mitsunobu条件下进行苯甲酰基衍生物16的分子内环化反应时,空前的一锅多米诺骨牌分子内“环化-N → O苯甲酰基迁移-环化”反应序列发生,导致形成手性2,6-二氮杂双环[3.2] .1]辛烷-4,8-二醇21的收率很高。通过详细的NMR研究和单晶X射线分析,确定了这种新型桥联双环化合物的结构。另一方面,叔叔在相同条件下,同一底物的丁基丁基二甲基甲硅烷基衍生物提供了受保护的6-氨基-1,6-二脱氧-L-古洛糖菌霉素32作为唯一产物。已经尝试通过构象分析来解释其反应性上的这种差异。该手稿中对新化合物的糖苷酶抑制作用研究表明,这些分子显示出对β- N-乙酰基己糖胺酶的中等但选择性的抑制作用。