2,4-Dinitrophenol as an activating reagent in a facile preparation of cyclic phosphate triesters
作者:Eric J. Amigues、Marie E. Migaud
DOI:10.1016/j.tetlet.2003.11.101
日期:2004.1
2,4-Dinitrophenol was employed with benzyloxy-bis-(diisopropylamino)phosphine to synthesise the cyclic phosphate derivatives of a series of alkane diols (HO-(CH2)(n)-OH, n= 2-6) in good isolated yields. Tetrazole and DNP were compared by P-31 NMR spectroscopy for their ability to catalyse the cyclisation at the P(III) stage. Investigation of the phosphate triester stability under various oxidation and chromatographic conditions resulted in the optimisation of the isolation procedures of the chemically unstable cyclic compounds. Conditions for debenzylation were developed to yield the corresponding cyclic phosphodiesters quantitatively. The methodology was further applied to the preparation and isolation of the cyclic phosphate derivative of a carbohydrate. (C) 2003 Elsevier Ltd. All rights reserved.