New approach to carbamoyl-polyoxamic acid derivatives through an oxazolidinone synthon
作者:Magalie Collet、Yves Génisson、Michel Baltas
DOI:10.1016/j.tetasy.2007.06.002
日期:2007.6
A key oxazolidinone synthon was obtained through condensation of vinyl magnesium with an epoxyimine, followed by a carbonation/cyclisation reaction in the presence of ammonium carbonate. Oxidative ozonolysis after protection and carbamolylation (optional) afforded the (5-0-carbamoyl-)polyoxamic derivatives in 9% (or 14%) total yield in six (or four) steps. (c) 2007 Elsevier Ltd. All rights reserved.
Stereoselective Access to the Versatile 4-Aminohex-5-ene-1,2,3-triol Pattern
We developed a stereocontrolled route allowing potential access to the eight isomers of 4-benzylaminohex-5-ene-1,2,3-triol in two or four steps and ca. 50% yield from readily available chiral nonracemic cis- or trans-alpha,beta-epoxyimine precursors. A new (NH4)(2)CO3-based carboxylation/intramolecular cyclization sequence allowed regio- and stereocontrolled C-3 epoxide opening while neat C-2 hydrolysis was ensured by simple aqueous acidic treatment.