Denmark SE, Dorow RL. Stereospecific cleavage of carbon-phosphorus bonds: stereochemical course of the phosphinoyl curtius (Harger) reaction.
Chirality 2002;
14:241-57. [PMID:
11835571 DOI:
10.1002/chir.10062]
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Abstract
The homochiral phosphinic azides (R,R)-1 and (S,S)-1 were prepared in enantiomerically pure form by resolution of diastereomeric phosphinamides derived from (S)-l-phenylethylamine and (R)-phenylglycine. Irradiation of the azides in methanol induced a photo-Curtius rearrangement to phosphonamidates in which the stereogenic carbon unit migrated to a nitrogen atom. Hydrolysis of the phosphonamidates produced 1-phenylethylamine, which was 99.0% e.e. and of the same configuration as the carbon unit in the starting azide (99.0% retention).
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