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Solid supports lend stability: Skeletally diverse alkaloid-like compounds were obtained in only three steps from simple starting materials through a strategy based on dihydropyridine and dihydroisoquinoline intermediates supported on macrobeads (see picture). The otherwise unstable enamine double bond present in the intermediates can undergo a variety of transformations, including cycloadditions, selective reductions, and alkylations.
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Taylor et al. (2004) studied this question.
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