Acetic Acid → cis-2-(4-Pyridylethyl)-3a,4,7,7a-tetrahydroisoindoline

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A mixture of 0.64 g of cis-3a,4,7,7a-tetrahydroisoindoline, 0.6 mL of 4-vinylpyridine, 0.4 mL of acetic acid and 10 mL of methanol was heated under reflux for 16 hours. Removal of the solvent and short-path distillation of the residue (160° bath temperature, 0.002 mm) gave 0.74 g. of cis-2-(4-pyridylethyl)-3a,4,7,7a-tetrahydropyridine. 1H NMR (in CDCl3) δ8.5 (d, 2H); 7.1 (d, 2H); 5.8 (m, 2H); 3.0 (m, 2H); 2.7-2.8(m, 4H); 2.4 (m, 2H); 2.2-2.3 (m, 4H) and 1.9 (d, 2H). The dihydrochloride hemi-hydrate had an indefinite melting point after crystallization from 2-propanol.

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