Application of 3,6-disubstituted imidazo[1, 2-b] pyridazine derivatives in preparation of fungicides
A technology of disubstituted imidazole and 2-b, applied in the field of pesticides, can solve problems such as unresearched inhibitory effects, and achieve the effect of strong bactericidal activity and broad-spectrum bactericidal activity
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Embodiment 1
[0031] A preparation method of 6-chloro-3-phenylimidazo[1,2-b]pyridazine, comprising the steps of:
[0032] (1) Preparation of 6-chloroimidazo[1,2-b]pyridazine:
[0033] 3-amino-6-chloropyridazine (3g, 23mmol) and n-butanol (30mL) were added in a 100mL round bottom flask, and chloroacetaldehyde (4.6mL, 50% aqueous solution) was added dropwise at room temperature and then refluxed for 16 hours. After the reaction is complete, the reaction solution is cooled to room temperature, and n-butanol is evaporated under reduced pressure, then 30 mL of water is added, and NaHCO 3 The solution was adjusted to pH 7, extracted with ethyl acetate (3×50 mL), anhydrous Na 2 SO 4 After drying, the organic phase was concentrated and purified by column chromatography to obtain 3.1 g of white solid compound 6-chloroimidazo[1,2-b]pyridazine (2), with a yield of 90%, M.p.115-117°C; 1 H NMR (400MHz, CDCl 3 ):δ7.35(d,1H,J=9.6Hz),7.85(s,1H),8.22(d,1H,J=9.6Hz),8.34(s,1H). 13 C NMR (100MHz, CDCl 3 ):...
Embodiment 2
[0040] The preparation method of 6-chloro-3-(2,3-dichlorophenyl)imidazo[1,2-b]pyridazine comprises the following steps:
[0041] The preparation steps (1) and (2) of Example 1 are the same, except that the phenylboronic acid in the step (3) of Example 1 is replaced by 2,3-dichlorophenylboronic acid to obtain compound 6 -Chloro-3-(2,3-dichlorophenyl)imidazo[1,2-b]pyridazine (4b), 48% yield, white solid, M.p.194-195℃, 1 H NMR (600MHz, CDCl 3 )δ7.99-7.98 (m, 2H), 7.59 (dd, 1H, J = 8.4Hz, 1.8Hz), 7.54 (dd, 1H, J = 8.4Hz, 1.2Hz), 7.36 (t, 1H, J = 7.8Hz), 7.13(d,1H,J=8.4Hz); 13 C NMR (150MHz, CDCl 3 )δ138.0, 135.5, 134.0, 132.9, 131.1, 130.1, 128.8, 127.3, 127.2, 126.4, 119.1. HRMS (ESI) calcd for C 12 h 7 N 3 Cl 3 [M+H] + m / z: 297.9706, found 297.9712.
Embodiment 3
[0043] The preparation method of 6-chloro-3-(2-fluorophenyl) imidazo[1,2-b]pyridazine comprises the following steps:
[0044] It is the same as the preparation step (1) and step (2) of Example 1, except that the phenylboronic acid in the step (3) of Example 1 is replaced by 2-fluorophenylboronic acid to obtain the compound 6-chloro- 3-(2-Fluorophenyl)imidazo[1,2-b]pyridazine (4c), 77% yield, white solid, M.p.70-72℃, 1 H NMR (400MHz, CDCl 3 )δ8.21(td, 1H, J=7.6Hz, 2.4Hz), 8.15(d, 1H, J=2.8Hz), 8.00(d, 1H, J=9.2Hz), 7.41-7.38(m, 1H) ,7.33-7.30(m,1H),7.24-7.22(m,1H),7.13(d,1H,J=9.6Hz); 13 C NMR (100MHz, CDCl 3 )δ159.8, 157.3, 145.7, 134.8, 134.7, 128.9, 128.1, 126.1, 123.1, 117.5, 115.0, 114.8. HRMS (ESI) calcd for C 12 h 8 N 3 FCl[M+H] + m / z: 248.0391, found 248.0400.
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