Abstract
The reaction of the methyl ester of 1,2-dibromopropionic acid with chiral Β- aminoalcohols under the conditions of the Gabriel-Cromwell reaction gave epimers of methyl 1-(Β-hydroxyalkyl)aziridine-2-carboxylates, which were separated by liquid chromatography. NMR spectroscopy and CD were used to determine the absolute configuration of these products. The relative rate of conversion of epimeric esters of trans-1-(Β-hydroxyalkyl)aziridine-2-carboxylic acids to 1-aza-4- oxabicyclo-[4.1.0]heptan-5-ones is a function of the intramolecular contacts of the reacting OH and CO2Me groups in the lactonization of the cis isomers. The most favorable conformation of the six-membered ring in 1-aza-4-oxabicyclo[4,1,0]heptan-5-ones in solution is a distorted boat.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 975–980, July, 1989.
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Krutius, O.N., Eremeev, A.V., Polyak, F.D. et al. Synthesis of optically active 1-aza-4-oxabicyclo[4.1.0]-heptan-5-ones. Chem Heterocycl Compd 25, 818–823 (1989). https://doi.org/10.1007/BF00472757
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DOI: https://doi.org/10.1007/BF00472757