Treatment of a variety of N-acyliminium ion precursors with 2,3-butadienyl(trimethyl)silane and related allenes in the presence of BF(3).OEt(2) provides good yields of N-protected 2-(aminomethyl)-substituted 1,3-dienes, which prove to be useful substrates for subsequent Diels-Alder and alkene metathesis reactions. [reaction: see text]
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Mentink et al. (2002) studied this question.
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