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Several 3H-spiro[[2]benzofuran-1,4′-piperidines] bearing a p-fluorobenzyl residue at the N-atom and various substituents in position 3 of the benzofuran system were synthesized. The crucial reaction steps are the addition of a lithiated benzaldehyde derivative to the p-fluorobenzylpiperidone 5 and the BF 3 ·OEt 2 catalyzed substitution of the methoxy group of 2a by various nucleophiles...
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