3-(3-Piperidyl)isoquinoline and 3-(4-piperidyl)isoquinoline have been synthesized from o-tolylaldehyde aldimines and the methylmethoxycarboxamides (Weinreb amides) of N-Boc-substituted nipecotic and isonipecotic acids.
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Kovalskiy, D.A., Perevalov, V.P. Synthesis of 3-(3-piperidyl)-isoquinoline and 3-(4-piperidyl)-isoquinoline. Chem Heterocycl Comp 45, 957–964 (2009). https://doi.org/10.1007/s10593-009-0368-6
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DOI: https://doi.org/10.1007/s10593-009-0368-6