An efficient three-step synthesis of α-methylenebutyrolactones consisting of enamine formation, Michael addition to ethyl β-nitroacrylate, and borohydride reduction with simultaneous lactonization and elimination of the nitro-group, is described.
J. W. Patterson and J. E. Mcmurry, J. Chem. Soc. D, 1971, 488 DOI: 10.1039/C29710000488
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