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To verify that lactone ring opening was proceeding with rigorous inversion of stereochemistry, the enantiomeric purities of azides 11a-c were determined by chiral HPLC (Chiralcel OD-H column) of the methyl esters derived from 11a and 11b, and the benzyl ester derived from 11c. See Section 6 for full procedural details
-
To verify that lactone ring opening was proceeding with rigorous inversion of stereochemistry, the enantiomeric purities of azides 11a-c were determined by chiral HPLC (Chiralcel OD-H column) of the methyl esters derived from 11a and 11b, and the benzyl ester derived from 11c. See Section 6 for full procedural details.
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. (a) Compounds 12b and 12d: Alcón M., Canas M., Poch M., Moyano A., Pericás M.A., Riera A. Tetrahedron Lett. 35:1994;1589. (b) Compound 12c: Gordon E.M., Godfrey J.D., Delaney N.G., Asaad M.M., Von Langen D., Cushman D.W. J. Med. Chem. 31:1988;2199. (c) Compound 12e: Mendre C., Rodriguez M., Laur J., Aumelas A., Martinez J. Tetrahedron. 44:1988;4415.
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For the synthesis of β-lactones via lactonization of β-hydroxy carboxylate derivatives, see Ref. 21 and references therein
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For the synthesis of β-lactones via lactonization of β-hydroxy carboxylate derivatives, see Ref. 21 and references therein.
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. Acidic work-up of the dimethylsulfoxide reaction solutions should remove any remaining azide reagent by conversion to the sulfoximine, see: Johnson C.R., Rogers P.E. J. Org. Chem. 38:1973;1793.
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The potassium and magnesium halide carbamate salts were unstable toward decomposition during the course of the reaction
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The potassium and magnesium halide carbamate salts were unstable toward decomposition during the course of the reaction.
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