摘要:
The Eu(III)-catalyzed reaction of alpha-benzyloxyaldehydes with the (R)-3-hydroxybutanoate-derived ketene silyl acetal is shown to provide a higher level of both ''anti'' diastereofacial selection and rather unusual anti diastereoselection, compared with the conventional TiCl4-promoted version. The aldol adducts are elaborated to the carbapenem intermediates.