反应详情

Using 7.2 g (18 mmol) of 4-(2,3,4-trimethoxy-6-methylbenzoyl)-3-methoxy-5-trifluoromethylpyridine-N-oxide, 7 ml of toluene, 17 ml of dimethylformamide and 10 g (35 mmol) of phosphorus oxybromide, 4.1 g (yield 49%) of 4-(2,3,4-trimethoxy-6-methylbenzoyl)-2-bromo-3-trifluoromethyl-5-methoxypyridine (compound No. 124; m.p. 145-147° C.) was obtained in the same process as in Synthesis Example 9 step (f).