Synthesis of enantiomeric diethyl (1R,2R)- and (1S,2R)-1,2,3-trihydroxypropylphosphonates

Add time:08/02/2019    Source:sciencedirect.com

Addition of diethyl phosphite to 2,3-O-cyclohexylidene-D-glyceraldehyde catalyzed by triethylamine or fluorides led to ca. 35:65 mixtures of diethyl (1R,2R)- and (1S,2R)-2,3-O-cyclohexylidene-1,2,3-trihydroxypropylphosphonates (4a) and (4b). Application of lithium diethylphosphonate only slightly improved diastereoselectivity. Through chromatographic separation of 4a and 4b the protected trihydroxypropylphosphonates became available for the first time as pure enantiomers. The 1S configuration in the major diastereoisomer 4b was assigned on the basis of conformational and configurational analysis of 1,2-O-isopropylidene derivatives obtained from the title compounds.

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