反应详情

To a suspension of 4-(4-bromo-2-chlorophenylamino)-5,6-dichloronicotinic acid (4.3975 g, 11.2 mmol) in a mixture 70 ml MeOH and 70 ml toluene was added TMS-diazomethane (10 ml, 20 mmol, 2M/hexanes) in small portions at room temperature. At the end of the addition the suspension turned into a solution, and then a precipitate was formed again. The suspension was diluted with hexanes and filtered. And the precipitate was washed with hexanes and dried in vacuo to obtain the title compound 3.03 g (66%).

1. additionAt the end of the addition the suspension
2. customa precipitate was formed again
3. filtrationfiltered
4. washAnd the precipitate was washed with hexanes
5. customdried in vacuo