A new and highly stereoselective synthesis of polyhydroxyindolizidines from 4-octulose derivatives
作者:Isidoro Izquierdo、Maria T Plaza、Rafael Robles、Antonio J Mota
DOI:10.1016/s0957-4166(98)00064-0
日期:1998.3
(1S,2S,6R,7R,8R,8aR)-1,2,6,7,8-Pentahydroxyindolizidine 12 and (1R,6R,7R,8R,8aR)-1,6,7,8-tetrahydroxyindolizidine (1,6-diepicastanospermine, 24) have been stereoselectively synthesized from the important key intermediates 1,4-dideoxy-1,4-imino-D-erythro-L-altro-octitol 7 and 1,2,4-trideoxy-1,4-imino-D-glycero-D-talo-octitol 20 in three steps. Compounds 7 and 20 were readily obtained from 2,3:4,5:6,7-tri-O-isopropylidene-beta-D-glycero-D-galacto-oct-4-ulo-4,8-pyranose 1 and 2-deoxy-4,5:6,7-di-O-isopropylidene-beta-D-manno-oct-4-ulo-4,8-pyranose 13 in four steps, respectively. (C) 1998 Elsevier Science Ltd. All rights reserved.
(1S,2S,6R,7R,8R,8aR)-1,2,6,7,8-五羟基吲哚齐啶(12)和(1R,6R,7R,8R,8aR)-1,6,7,8-四羟基吲哚齐啶(1,6-去环化合欢啶,24)已从重要关键中间体1,4-去氧-1,4-亚胺基-D-赤-L-阿洛-octitol(7)和1,2,4-三去氧-1,4-亚胺基-D-甘露糖基-D-塔罗-octitol(20)中以三步法立体选择性地合成。化合物7和20分别以四步法从2,3:4,5:6,7-三-O-异丙叉基-D-甘露糖基-D-半乳糖-oct-4-ulo-4,8-吡喃糖(1)和2-deoxy-4,5:6,7-二-O-异丙叉基-D-甘露糖-oct-4-ulo-4,8-吡喃糖(13)中容易获得。版权:1998 Elsevier Science Ltd. 保留所有权利。