名称:
Preliminary studies on the incorporation of sugars into naphthoquinones: synthesis of (1R,2S,3S,4R,4aS,11bS)-2-(benzyloxy)-1,2,3,4,4a,5-hexahydro-1,3,4-trihydroxy-11bH-benzo[b]carbazole-6,11-dione
摘要:
The first total synthesis of (1R,2S,3S,4R,4aS,11bS)-2-(benzyloxy)-1,2,3,4,4a,5-hexahydro-1.3.4-trihydroxy-11bH-benzo[b]carbazole-6, 11-dione from D-glucose is described. The key steps of this synthesis are the stereoselective Michael addition of 2-lithium-1,4-dimethoxynapthalene to 3-O-benzyl-5.6-dideoxy-1,2-O-isopropylidene-6-nitro-alpha-D-xilohex-5-,enefuranose followed by the enantioselective intramolecular Henry reaction of 3-0-benzyl-5,6-dideoxy,-5-C-(1,4-dimethoxynaphthalene-2-yl)-6-nitro-beta-L-idofuranose to the key (1R,2S,3S,4R,5S,6S)-3-(benzylox),)-5-(1,4-dimethoxynaphthalene-2-yl)-1,2,4-trihydroxy-6-nitrocylco-hexane. (C) 2004 Elsevier Ltd. All rights reserved.