Fr. Alexandre et al., A new synthetic route to beta-unsubstituted beta-lactones by intramolecular cyclization, TETRAHEDRON, 56(24), 2000, pp. 3921-3926
When carboxylic acids beta-substituted by a tert-butoxy group were treated
with thionyl chloride, an intermediate acyl chloride beta-substituted by a
hydroxyl group was likely formed. Its subsequent intramolecular cyclization
produced novel beta-lactones in one step. Two enantiomerically enriched la
ctones could be prepared via intermediates obtained by enzymatic hydrolysis
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