Chiral symmetric phosphoric acid esters as sources of optically active organophosphorus compounds
摘要:
Chiral symmetric di- and trialkylphosphites, derivatives of (-)-borneol, (-)-menthol and (-)-1,2:5,6-di-O-isopropylidene-alpha-D-glucofuranose, were studied as starting reagents for the preparation of chiral organophosphorus compounds. The reaction occurs by asymmetric induction at the alpha-carbon atom of substituted alpha-alkylphosphonates. The stereoselectivity of the reaction depends on the structure of the starting compounds and the reaction conditions. The configuration of the alkylphosphonates was established by NMR spectroscopy, by transformation into alpha-hydroxyalkylphosphonic acids and by X-ray crystal structure analysis. (C) 1998 Elsevier Science Ltd. All rights reserved.