Synthesis of α,β-unsaturated compounds

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Optimized conditions for the Wittig reaction of aldehydes with ethyl tribromoacetate and triphenylphosphine allowed the synthesis of α-bromoacrylates with high selectivity. A simple and efficient one-pot procedure was developed for the preparation of various conjugated acetylenic carboxylates in good yields.
J.-G. Kim, D. H. Kang, D. O. Jang, Synlett, 2008, 443-447.

An oxidative alkyne translocation of readily accessible homopropargylic alcohols provides unsymmetrical but-2-yne-1,4-diones in good yields via an unprecedented one-pot sequential electro-oxidative annulation-fragmentation-chemical selenoxide elimination process. Excellent functional group compatibility was observed.
A. Halder, D. Maiti, J. Dutta, S. D. Sarkar, Org. Lett., 2023, 25, 7578-7583.