Organic Letters
Letter
(15) For reviews of (3 + 2) cycloaddition of azomethine ylides and
alkenes: (a) Pandey, G.; Banerjee, P.; Gadre, S. R. Chem. Rev. 2006,
106, 4484. (b) Adrio, J.; Carretero, J. C. Chem. Commun. 2011, 47,
6784.
(16) For example, direct C2-halogenation or decarboxylative
halogenation provides an entryway into performing metal-promoted
cross-coupling reactions.
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dx.doi.org/10.1021/ol501580b | Org. Lett. 2014, 16, 3580−3583