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D-homo-Cephalotaxine analogues 19 and 23 have been prepared by intramolecular Heck reactions of 12 and 22. The substrates 12 and 22 were obtained by alkylation and acylation, respectively, of the spirocyclic amines 17, which, in turn, were generated by intramolecular palladium-catalyzed allylic amination.
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Tietze et al. (2000) studied this question.
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