反应详情

(R)-(+)-2,2′-Bis(diphenylphosphino)-1,1′-binaphthyl (10.4 mg, 16.7 μmol) was dissolved in toluene (0.5 ml) under heat, cooled to room temperature, palladium(II) acetate (2.5 mg, 11.1 μmol) was added, followed by stirring for 1 minute. This was put into a toluene (0.5 ml) suspension of 7-bromo-2-tert-butyl-6-(2-furyl)-5-methyl-1,3-benzoxazole-4-carbonitrile (I-10) (40 mg, 111 μmol), (3S)-3-(dimethylamino)pyrrolidine (16.9 μl, 134 μmol), sodium tert-butoxide (15.0 mg, 156 μmol), followed by stirring at 80° C. for 17 hours. After cooling, brine (30 ml) was added to the reaction liquid, the product was extracted with chloroform (30 ml×3). The organic layer was washed with saturated brine (30 ml), then dried over anhydrous magnesium sulfate, concentrated under reduced pressure. The residue was purified by silica gel column chromatography (chloroform:methanol=1:0→100:1) to obtain the entitled compound (5.9 mg, 13%) as a yellow solid.

1. temperatureunder heat
2. stirringby stirring at 80° C. for 17 hours
3. temperatureAfter cooling
4. extractionthe product was extracted with chloroform (30 ml×3)
5. washThe organic layer was washed with saturated brine (30 ml)
6. dry with materialdried over anhydrous magnesium sulfate
7. concentrationconcentrated under reduced pressure
8. customThe residue was purified by silica gel column chromatography (chloroform:methanol=1:0→100:1)