Novel dienes, formed by reaction of α-ylidene and α-alkoxylidene lactones with the lithium salt of acetonitrile, are readily converted into benzofuran precursors by a highly regioselective (and in the case of the former derivatives) a highly stereoselective Diels–Alder reaction.
A. W. Murray, N. D. Murray and R. G. Reid, J. Chem. Soc., Chem. Commun., 1986, 1230 DOI: 10.1039/C39860001230
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