反应详情

A stirred solution of 2,6-difluoroaniline (1.52 g) and triethylamine (1.19 g) in dichloromethane (50 mL) at room temperature is treated dropwise with a solution of 3-cyclopentyloxy-4-methoxybenzoyl chloride (3.0 g), that is prepared as described hereinafter in Reference Example 3) in dichloromethane (50 mL). The solution is stirred and heated at reflux for 4 hours, then it is cooled, washed with water and dried over magnesium sulfate. The solution is concentrated and the resulting residue is recrystallized from ethyl acetate, to give N-(2,6-difiuorophenyl)-3-cyclopentyloxy-4-methoxybenzamide (1.9 g), m.p. 158°-160° C. [NMR(CDCl3): 1.55-1.7(m,3H),1.8-2.05(m,5H), 3.93(s,3H),4.85(m,1H),6.9(d,1H),6.95-7.03(m,2H), 7.2-7.3(m,1H),7.3(bs,1H), 7.45(q,1H),7.53(d,1H); Elemental analysis: C,65.1; H,5.6;F, 10.4; N,4.2%; Calculated: C,65.7; H,5.5; F, 10.9; N,4.0%];

1. customis prepared
2. temperatureheated
3. temperatureat reflux for 4 hours
4. temperatureit is cooled
5. washwashed with water
6. dry with materialdried over magnesium sulfate
7. concentrationThe solution is concentrated
8. customthe resulting residue is recrystallized from ethyl acetate