нужна след. статейка:
Diastereoselective 1,3-Dipolar Cycloadditions and Michael Reactions of Azomethine Ylides to (2R)-3-Benzoyl-4-methylidene-2-phenyloxazolidin-5-one and (2S)-3-Benzoyl-2-t-butyl-4-methylideneoxazolidin-5-one
Stephen G. Pyne, Javad Safaei-G., Karl Schafer, Abdollah Javidan, Brian W. Skelton and Allan H. White
Australian Journal of Chemistry 1998, 51(2), pp. 137 - 158
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http://dx.doi.org/doi:10.1071/C97072СПАСИБО ЗА ПОМОЩЬ!