Synthesis of (3S, 4S)-4-hydroxy-2, 3, 4, 5-tetrahydropyridazine-3-carboxylic acid, component of luzopeptin A.
摘要:
The enantioselective synthesis of (3S, 4S)4-hydroxy-2, 3, 4, 5-tetrahydropyridazine-3-carboxylic acid 1 is described. The two stereogenic centers in anti relationship are obtained by sequential enantio and chemoselective hydrogenation of beta-ketoester in presence of chiral ruthenium catalyst and diastereoselective amination of beta-hydroxyester with di t-butylazodicarboxylate.
new class of 2-methylallyl ruthenium chiral diphosphines 1 are efficient in asymmetric hydrogenation of α,β unsaturated acids and allylic alcohols. The related chiral halogen-containing ruthenium catalysts 2 are prepared from 1 or in situ from (COD)Ru(η)3-(CH2)2CHCH3)2 by ligand exchange with the chelatingdiphosphine followed by protonation (HX) in acetone. This procedure allows rapid screening of chiral
A general preparation of chiral ruthenium(II) catalysts and the homogeneous enantioselective hydrogenation of prochiral olefins and keto groups are presented. Some applications to the synthesis of biologically active compounds are reported. (C) 1998 Elsevier Science S.A. All rights reserved.
Synthesis of (3S, 4S)-4-hydroxy-2, 3, 4, 5-tetrahydropyridazine-3-carboxylic acid, component of luzopeptin A.
作者:Christine Greck、Laurent Bischoff、Jean Pierre Genêt
DOI:10.1016/0957-4166(95)00258-q
日期:1995.8
The enantioselective synthesis of (3S, 4S)4-hydroxy-2, 3, 4, 5-tetrahydropyridazine-3-carboxylic acid 1 is described. The two stereogenic centers in anti relationship are obtained by sequential enantio and chemoselective hydrogenation of beta-ketoester in presence of chiral ruthenium catalyst and diastereoselective amination of beta-hydroxyester with di t-butylazodicarboxylate.