Abstract
A method for obtaining of chiral phosphonobenzaldehydes has been developed. The Abramov reaction between dimenthyl phosphite and 4-diethoxymethylbenzaldehyde followed by separation of stereoisomers has yielded enantiomerically pure (1S)- and (1R)-1-hydroxyphosphonates. The resulting phosphonates, after removal of acetal protection, have been converted to (1S)- and (1R)-1-hydroxymethylphosphonobenzaldehydes. By reacting with (diethylamino)trifluorosulfurane, 1-hydroxyphosphonates have been converted to 4-(1-fluoromethyl)phosphonobenzaldehydes. The synthesized chiral phosphonobenzaldehydes are convenient chiral reactants for the preparation of phosphorus analogs of natural compounds, as has been shown with the example of synthesis of the phosphonium analog of phosphotyrosine.
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