1-Aminopiperidine → 1-[bis(4-chlorophenyl)methyl]-3-{(methylsulfonyl)[3-(N-piperidylcarbamoyl)phenyl]methylene}azetidine

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A mixture of 0.45 g of 1-[bis(4-chlorophenyl)methyl]-3-{(methylsulfonyl)[3-(pentafluorophenoxycarbonyl)phenyl]methylene}azetidine, 0.07 cm3 of 1-aminopiperidine in 4 cm3 of dimethylformamide is stirred for 18 hours at room temperature. The mixture is taken up in 30 cm3 of ethyl acetate. The organic phase is washed with 3 times 50 cm3 of water, dried over magnesium sulfate, filtered and concentrated to dryness under reduced pressure (2.7 kPa). 0.2 g of 1-[bis-(4-chlorophenyl)methyl]-3-{(methylsulfonyl)[3-(N-piperidylcarbamoyl)phenyl]methylene}azetidine is obtained melting at 175° C. [NMR spectrum in DMSO-d6, T=300K, δ in ppm (400 MHz): 1.40 (2H, m, CH2), 1.60 (4H, m, 2CH2), 2.85 (4H, m, 2NCH2), 3.00 (3H, s, SCH3), 3.80 (2H, s, NCH2), 4.20 (2H, s, NCH2), 4.80 (1H, s, NCH), between 7.45 and 7.60 (10H, m, 10CH arom.), 7.75 (2H, m, 2CH arom.), 9.45 (1H, s, NH)].

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