β-Lithioacrylate Equivalents for the Synthesis of (±)-Eldanolide

Abstract
Direct lithiation of ß-phenylthioacrylic acid and of methyl propiolate affords useful ß-lithioacrylate and ß-lithiopropionate equivalents. This is demonstrated in this paper in a convenient synthesis of (±)-eldanolide (±)-1 and in the transformation of butenolide (±)-7 into butyrolactone (±)-9, respectively.

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