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Creators/Authors contains: "Sosa, Juan R."

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  1. ; ; (, Organic & Biomolecular Chemistry)
    In an extension of our studies on low-temperature rearrangements of 1-alkynyl ethers, we describe herein the [3,3]-sigmatropic rearrangement of in situ formed propargyl alkynyl ethers to allenyl ketenes, which furnish complex tert -butyl-(2 E ,4 Z )-dienoates 2 in good yields upon tert -butanol addition. Similarly, sigmatropic rearrangements of in situ formed propargyl lithioalkynyl ethers yield methyl-(2 Z ,4 Z )-dienoates 4 upon methanol addition or unsaturated lactones 6 upon aldehyde or ketone addition to the allenyl ynolate intermediate. 
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