Excess BF3 causes regioselectivity reversion in the reaction of methyl 4,5-epoxypent-2-enoate 1 with Ph2CuLi; this is rationalised by a two step conversion via methyl 4-bromo-5-hydroxypent-2-enoate 5.
S. Nagumo, S. Irie and H. Akita, J. Chem. Soc., Chem. Commun., 1995, 2001 DOI: 10.1039/C39950002001
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