Abstract
Lithium or sodium dialkyl phosphites and diamido phosphites 3 undergo addition to (+)-(S)-benzylidene-p-toluenesulfinamide 2 affording N-sulfinyl-α-aminophosphonates 4 in a diastereoisomeric ratio from 63:37 to 94:6. The major diastereoisomers formed in addition of lithium dimethyl phosphite 3a and lithium bis-diethylamido phosphite 3e to (+)-(S)- 2 were separated and converted into enantiopure (+)-(R)- and (−)-(S)-α-aminobenzyl phosphonic acids 5, respectively.
Published Version
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