[2+3] Cycloadditions of Enantiomerically Pure Oxazoline-N-Oxides: Stereoselective Synthesis of Functionalized β-Lactones

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Abstract
A diastereoselective [2+3] cycloaddition between oxazoline-N-oxide 6 and α,β-unsaturated esters 7a, 7b afforded cycloadducts 8a, 8b. Adduct 8b was subsequently transformed into β-lactone 21 in a seven step high yield sequence of reactions.

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