Synthesis of 3,4-Fused Bicyclic β-Lactams and Their Transformation into Methyl<i>cis</i>-3-Aminotetrahydrofuran-2-carboxylates
作者:Erika Leemans、Matthias D'hooghe、Yves Dejaegher、Karl W. Törnroos、Norbert De Kimpe
DOI:10.1002/ejoc.200901110
日期:2010.1
cis-3-Benzyloxy-4-(2-bromo-1,1-dimethylethyl)azetidin-2-ones were transformed into the corresponding 3-hydroxy-beta-lactams through hydrogenolysis of the benzyl ether substituent, followed by formation of novel cis-2-oxa-6-azabicyclo[3.2.0] heptan-7-ones by intramolecular nucleophilic substitution utilizing triethylamine in benzene. The conversion of the latter cis-2-oxa-6-azabicyclo[3.2.0]heptan-7-ones