The various steric, stereoelectronic, and electrostatic factors which influence the bicycloannulation of Δ2-tetrahydropyridines are discussed in connection with a concise two-step synthesis of the protoberberine alkaloid karachine (1).
R. V. Stevens and J. R. Pruitt, J. Chem. Soc., Chem. Commun., 1983, 1425 DOI: 10.1039/C39830001425
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