N1-cyclic amine-N5-substituted phenyl biguanide derivatives, methods of preparing the same and pharmaceutical composition comprising the same
A phenylbiguanide and substituent technology, applied in the field of N1-cyclic amine-N5-substituted phenylbiguanide derivatives, can solve the problems of large tablets, lactic acidosis, and difficulty in swallowing by patients
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Embodiment 1
[0093] Embodiment 1: the synthesis of N1-piperidine cyanoguanidine
[0094] Piperidine (92.8ml, 0.940mol) was dissolved in butanol (300ml), concentrated hydrochloric acid (81.7ml, 0.940mol) was added to the resulting solution and stirred at 0°C for 30 minutes. Sodium dicyanamide (92.0 g, 1.03 mol) was added to the resulting mixed solution, and the resulting reaction mixture was stirred under reflux for 24 hours. After confirming that the reaction was finished, the reaction mixture was filtered, and the sodium chloride formed in the filtration was removed, and the filtrate was concentrated under reduced pressure. Distilled water (100 ml) was added to the concentrate, followed by stirring at room temperature for 1 hour. The formed solid was filtered, the filter cake was washed with distilled water (2×20 ml), and then dried under reduced pressure to obtain the target compound as a white solid (93.3 g, 65%).
[0095] 1 H NMR (600MHz, DMSO-d 6 )δ7.01 (br, s, 2H), 3.39 (m, 4H), ...
Embodiment 2
[0096] Embodiment 2: the synthesis of N1-azetidine cyanoguanidine
[0097]
[0098] The title compound (1.13 g, 52%) was prepared as a white solid as described in Example 1, but substituting azetidine for the piperidine used in Example 1.
[0099] 1 H NMR (600MHz, DMSO-d 6 )δ6.92 (br, s, 2H), 3.91 (t, J=7.8Hz, 4H), 2.16 (tt, J=7.8, 7.8Hz, 2H); LC-MSm / z125.2[M+1] + ; mp 188-189°C.
Embodiment 3
[0100] Embodiment 3: N1-pyrrolidine cyanidine
[0101]
[0102] The title compound (24.5 g, 63%) was prepared as a white solid as described in Example 1, but substituting pyrrolidine for the piperidine used in Example 1.
[0103] 1 H NMR (600MHz, DMSO-d 6 )δ6.88 (br, s, 2H), 3.24 (m, 4H), 1.80 (m, 4H); LC-MS m / z139.2[M+1] + ; mp 232-235°C.
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