반응 #474609

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BINAP

cesium carbonate

5-bromo-2-chlorobenzotrifluoride

4-(3-amino-benzo[1,2,4]triazin-7-yloxy)-pyridine-carboxylic acid methylamide

→

4-[3-(4-chloro-3-trifluoromethyl-phenylamino)-benzo[1,2,4]triazin-7-yloxy]-pyridine-2-carboxylic acid methylamide trifluoroacetate salt

용매

dimethylformamide

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후처리

1. 1
   기타Argon gas was bubbled through the mixture for 5 min
2. 2
   기타Then the vial was capped
3. 3
   기타the longer reaction times
4. 4
   기타result in the formation of the by-product and partial decomposition
5. 5
   온도to cool down to ambient temperature
6. 6
   여과filtered through 0.3 μm syringe
7. 7
   여과filter
8. 8
   기타purified by reverse-phase

실험 절차

To a vial with 2 mL of anhydrous dimethylformamide under argon atmosphere were added 15.4 mg (0.0168 mmol, 0.05 equivalent) of tris(dibenzyllideneatone) dipalladium(0), 21.0 mg (0.033 mmol, 0.1 equivalent) of BINAP, 220.0 mg (0.675 mmol, 2.0 equivalent) of anhydrous cesium carbonate, 175.1 mg (0.675 mmol, 2.0 equivalent) of 5-bromo-2-chlorobenzotrifluoride, and 100 mg (0.337 mmol, 1.0 equivalent) of 4-(3-amino-benzo[1,2,4]triazin-7-yloxy)-pyridine-carboxylic acid methylamide, in that particular order. Argon gas was bubbled through the mixture for 5 min. Then the vial was capped and the reaction mixture was heated to 120° C. with stirring under argon atmosphere for 18 hours. At this point LC/MS indicated about 40% conversion to the product. As pointed out in the previous examples, the longer reaction times result in the formation of the by-product and partial decomposition. So, the reaction mixture was allowed to cool down to ambient temperature, filtered through 0.3 μm syringe filter and purified by reverse-phase prep-HPLC using acetonitrile/water mixture with 0.1% of TFA.

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