Triethylamine → methyl 1-(10,11-dihydro5H-dibenzo[a,d][7]annulen-5-yl)-1,2,5,6-tetrahydropyridine-3-carboxylate

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Reaction Conditions

Reaction Steps

To 7.338 g (41.31 mol) of guvacoline hydrochloride (Arzneim. Forsch. 1989, 39(5), 539. ) in dioxane (100 ml) was added 5-chloro-dibenzosuberane (14.933 g, 65.39 mmol), Nal (catalytic, ˜1 g), and triethylamine (17 mL, 122.0 mmol) to give a brown heterogeneous slurry that was heated at 90° C. overnight. The solvent was then concentrated and the resultant sludge was taken up in ethyl acetate and sequentially washed with Na2HPO4 buffer (pH 4), Na2CO3 (saturated aqueous), and brine. The organics were then dried over Na2SO4 and concentrated, resulting in a brown solid which was purified by chromatography on silica gel eluting with 1-5% ethyl acetate/hexanes to give 1-(10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-yl)-1,2,5,6-tetrahydro-pyridine-3-carboxylic acid methyl ester as a white solid (9.584 g, 28.74 mmol, 67%). 1H NMR (400 MHz, CHLOROFORM-D) δ ppm 2.22 (dt, J=9.28, 2.68 Hz, 2H) 2.41 (t, J=5.56 Hz, 2H) 2.73-2.83 (m, 2H) 2.99-3.05 (m, 2H) 3.65 (s, 3 H) 3.90-4.00 (m, 2H) 4.11 (s, 1H) 6.94-6.99 (m, J=3.98, 3.98, 1.89, 1.77 Hz, 1 H) 7.05-7.11 (m, 4H) 7.13-7.21 (m, 4H).

Provenance & Evidence