作者:Isidoro Izquierdo、María T. Plaza、Juan A. Tamayo、Francisco Franco、Fernando Sánchez-Cantalejo
DOI:10.1016/j.tet.2008.03.089
日期:2008.5
Syntheses of 2,5,6-trideoxy-2,5-imino-d-alditol (2, 6-deoxy-DADP) and its enantiomer (3) from tri-orthogonally protected derivatives of DADP have been developed employing lipase-mediated kinetic desymmetrization and protecting group manipulations. Thus, and as an example, the starting DADP derivative (4) was transformed into a new symmetrical 2,5-bis(hydroxymethyl)pyrrolidine (6) by sequential N-protection
2,5,6-三脱氧-2,5-亚氨基d-糖醇(的合成2,6-脱氧DADP)及其对映体(3从DADP的三正交保护的衍生物)已经开发了采用脂肪酶介导的动力学非对称化和保护组操作。因此,并且作为实例,通过顺序的N-保护和双-O-去甲硅烷基化,将起始DADP衍生物(4)转化为新的对称的2,5-双(羟甲基)吡咯烷(6)。最好在乙酰化条件下进行脂肪酶介导的6脱对称,得到(2 R)-乙酰氧基甲基衍生物7。绝对配置和ee为7通过与同手性样品的化学相关性明确建立了它们。化合物7直接转化为目标2,5,6-三苯氧基-2,5-亚氨基己糖醇3。