Abstract
Abstract An improved procedure for the efficient synthesis of β-halobutenolides was developed. The Pd(0)-catalyzed coupling reactions of β-halobutenolides with terminal alkynes or organozinc reagents, i.e., 1-alkenyl, aryl, and alkyl zinc reagents, to afford β-substituted butenolides were carefully studied. Using the coupling protocol of γ-(n-butyl)-β-iodobutenolide with methylzinc halide, we performed an efficient formal synthesis of whisky lactone.
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