Cyclopentanone → Cyclohexanone, 2-[(2-oxocyclopentyl)methyl]-

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2-(oxo-cyclopentyl)methyl cyclohexanone is prepared from 2-(dimethylaminomethyl)-cyclohexanone and cyclopentanone according to the method described in Ann.Chim., 1963, 53 (6), 819 and is isolated as a colourless oil in 80% yield b.p. 92°/0.05 mm. 5,6,7,8-Tetrahydro-2,3-dihydro-1H-cyclopenta[b]quinoline is prepared from 2-(2-oxocyclopentyl)methylcyclohexanone according to the method described in Ann.Chim., 1963, 53, (6), 819 and is isolated in 65% yield as a colourless oil b.p. 80°/0.05 mm. The hydrochloride is prepared for characterisation by treating an ethereal solution of the base with ethereal HCl and is isolated as the hemihydrate as colourless needles from ethanol-ether m.p. 104° C (Found: C, 65.7; H, 7.8; N, 6.6. C12H16N.HCl.1/2H2O requires: C, 65.8; H, 7.8; N, 6.4%. 5,6,7,81H-cyclopenta[b]quinoline is converted to methyl 5,6,7,8-tetrahydro-2,3-dihydro-1H-cyclopenta[b]quinoline-5-carboxylate following the method described in Example 19 and this is converted to 5,6,7,8-tetrahydro-2,3-dihydro-1H-cyclopenta[b5-carboxamide following the method described in Example 22. The amide is converted to the title compound, following the procedure of Example 23, and is recrystallised from isopropanol, dissolved in ether and treated with an excess of ethereal HCl. The resultant solid is recrystallised from ethanol-ether to give the hydrochloride of the title compound as the monohydrate m.p. 118° C. (Found: C, 54.6; H, 6.3; H, 10.0. C13H16N2S.HCl H2O requires: C, 54.4; H, 6.6; H, 9.8%)

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