Oxetane cis- and trans-β-amino-acid scaffolds from l-rhamnose by efficient SN2 reactions in oxetane rings; pseudoenantiomeric analogues of the antibiotic oxetin
作者:Stephen W. Johnson、Sarah F. Jenkinson (née Barker)、Donald Angus、John H. Jones、George W.J. Fleet、Claude Taillefumier
DOI:10.1016/j.tetasy.2004.07.032
日期:2004.9
An efficient multigram ring contraction of a 1,4-lactone 2-O-triflate derived from L-rhamnose-with retention of configuration in the ring closure-is the key step in the preparation of a series of oxetanes, which are pseudoenantiomeric analogues of the naturally occurring antibiotic oxetin, an oxetane cis-beta-amino acid. Subsequent nucleophilic displacements of the corresponding triflates by azide proceed in consistently excellent yields, without any elimination, to provide syntheses of scaffolds for analogues of the antibiotic. (C) 2004 Elsevier Ltd. All rights reserved.