An alternative approach to aminodiols from Baylis-Hillman adducts. Stereoselective synthesis of chloramphenicol, fluoramphenicol and thiamphenicol

Abstract

We describe herein a new approach for the stereoselective synthesis of broad spectrum antibiotics from Baylis-Hillman adducts. The strategy is based on the preparation of an ene-carbamate directly from a Baylis-Hillman adduct using a Curtius rearrangement reaction. Stereoselective hydroboration furnished a mixture of diastereoisomeric aminoalcohols (syn and anti). After chromatographic separation, the syn diastereoisomer was directly transformed into the antibiotics. ©2005 Sociedade Brasileira de Química.