A three-step synthesis of α-methylene-β-butyrolactones is described, via radical cyclisation of 2-bromoalkyl prop-2-ynyl ethers (5) to 3-methylenetetrahydrofurans (6) using a tin catalyst.
A. Srikrishna, J. Chem. Soc., Chem. Commun., 1987, 587 DOI: 10.1039/C39870000587
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