(+/-)-15-Deoxyspergualin (DSG) has recently been marketed in Japan for the control of corticoresistant acute renal graft, rejection. A nine-step total synthesis of its eutomer ((-)-DSG) 2 has been developed starting from 7-bromoheptanenitrile 3 and N-1, N-4-bis(benzyloxycarbonyl)spermidine. The use of a chiral alpha-alkylbenzyl group to protect the hydroxyl of the alpha-hydroxyglycine moiety allowed its chromatographic resolution and afforded a practical access to 2 with a high optical purity and a 7% overall yield. Moreover, X-ray structure analysis of the key crystalline intermediate 7b definitely confirmed the previously proposed absolute configuration of 2.
(+/-)-15-脱氧斯伯克林(DSG)最近在日本被用于控制皮质类
固醇抵抗型急性肾移植排斥反应。从
7-溴庚腈(3)和N-1, N-4-双(苄氧羰基)-
亚精胺出发,通过九步反应成功开发了其eutomer((-)-DSG)2的全合成。通过使用手性α-烷基苯甲基保护基团来保护α-羟基丙
氨酸部分中的羟基,实现了其色谱分离,并以高光学纯度和7%的整体产率提供了一种实用的制备途径。此外,关键晶体中间体7b的X射线结构分析明确证实了2的绝对构型的先前假设。