Pyrimidinyloxy benzene derivatives as herbicides
a technology of pyrimidinyloxy benzene and derivatives, which is applied in the field of pyrimidinyloxy benzene derivatives, can solve the problems of increasing consumer costs
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example 1
Preparation of 2-[(5-chloro-2-pyrimidinyl)oxy]-N-(2,2,2-trifluoroethyl)benzamide (Compound 28)
Step A: Preparation of 2-methoxy-N-(2,2,2-trifluoroethyl)benzamide
[0313]A solution of 2,2,2-Trifluoroethylamine (1.28 g, 12.89 mmoles) and triethylamine (4.1 mL, 29.31 mmoles) in dichloromethane (30 mL) was cooled to 0° C. The reaction mixture was treated with a solution of 2-methoxybenzoyl chloride (2.0 g, 11.72 mmoles) in in dichloromethane (8 mL) at a temperature below 5° C. The reaction mixture was allowed to slowly warm to room temperature. De-ionized water was added and the mixture partitioned. The aqueous phase was extracted with dichloromethane. The combined organic phases were washed with 1N HCl and saturated aqueous sodium chloride solution and dried with magnesium sulfate and concentrated under vacuum to a white solid. The solid was filtered from hexanes to obtain the title compound (2.24 g) as a solid.
[0314]1H NMR (400 MHz, CDCl3) δ 8.20 (d, 2H), 7.49 (t, 1H), 7.10 (t, 1H), 7.00...
example 2
Preparation of 3-buten-1-yl 2-bromo-6-[(5-chloro-2-pyrimidinyl)oxy]benzoate (Compound 21)
Step A: Preparation of 3-butenyl 2-bromo-6-hydroxybenzoate
[0319]To a stirred solution of 2-bromo-6-hydroxybenzoic acid (0.200 g, 0.921 mmol) in dry dichloromethane (3 mL) was added oxalyl chloride (94.8 μL, 1.11 mml) and 2 drops of N,N′-dimethylformamide. The reaction mixture was stirred at room temperature for 3 hours. The reaction mixture was then concentrated under vacuum and the residue was dissolved in dry dichloromethane (3 mL) and treated with 3-buten-1-ol (86.9 μL, 1.01 mmol) and 3 drops of triethylamine. The reaction mixture was stirred at room temperature for 18 hours. The reaction mixture was concentrated under vacuum onto Celite® diatomaceous earth filter aid and purified by column chromatography on silica gel, eluting with 0 to 20% ethyl acetate in hexanes to afford the title compound (0.117 g).
[0320]1H NMR (500 MHz, CDCl3) δ 10.96 (s, 1H), 7.24-7.17 (m, 2H), 6.98-6.93 (m, 1H), 5.95...
example 3
Preparation of 3,3,3-trifluoropropyl 2-bromo-6-[(5-chloro-2-pyrimidinyl)oxy]benzoate (Compound 26)
Step A: Preparation of 3,3,3-trifluoropropyl 2-bromo-6-hydroxybenzoate
[0323]To a stirred solution of 2-bromo-6-hydroxybenzoic acid (0.500 g, 2.30 mmol) and molecular sieves in 3,3,3-trifluoropropan-1-ol (15 mL) was added concentrated sulfuric acid (0.300 mL). The reaction mixture was heated at 78° C. for 24 hours. The reaction mixture was cooled to room temperature and filtered through a small pad of Celite® diatomaceous earth filter aid. The filtrate was diluted with ethyl acetate and washed with water, and saturated aqueous sodium chloride solution. The organic phase was separated, dried over magnesium sulfate and concentrated under vacuum. The crude material was purified by column chromatography on silica gel, eluting with 0 to 20% ethyl acetate in hexanes to afford the title compound (0.268 g).
[0324]1H NMR (500 MHz, CDCl3) δ 10.79 (s, 1H), 7.26-7.20 (m, 2H), 7.00-6.94 (m, 1H), 4.63 ...
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