86% |
With tris-(dibenzylideneacetone)dipalladium(0); sodium t-butanolate; XPhos; In toluene; at 100 - 110℃; for 2h;Inert atmosphere; |
(1) To mechanical agitation, thermometer, After replacing the three-port reaction flask in the condenser with nitrogen, Add intermediate 24a (100mmol) in sequence, Raw material 24b (95mmol), 300ml toluene, heated to reflux for 0.5h, Cool down to 70 - 80 C, Slowly add sodium tert-butoxide (150mmol), Pd2 (dba) 3 (0.25mmol), xphos (0.5mmol), After the system is stable, it is heated to 100 - 110 C for 2 hours. Reduce the temperature to 25 - 30 C, add 200ml of water, stir and separate with 100ml of toluene, and extract the aqueous phase once with 200ml of toluene. Separate the liquid, combine the organic phase, add 7g of anhydrous sodium sulfate to the organic phase, stir and dry, filter The organic phase is concentrated (-0.08-0.09MPa, 55-60 C ) so that Recrystallize with 60ml toluene, filter, 82 mmol of intermediate 24c was obtained with a yield of 86%. |
70% |
With tri-tert-butyl phosphine; palladium diacetate; sodium t-butanolate; In toluene; at 100℃; for 72h;Inert atmosphere; Sealed tube; |
An oven-dried pressure tube was cooled under nitrogen and charged with 9-bromanthracene (0.5 g, 1.9 mmol), distilled aniline (0.26 mL, 2.9 mmol), NaOtBu (0.44 g, 3.8 mmol), Pd(OAc)2 (22 mg, 5 mol%) and P(tBu)3 (23 uL, 0.1 mmol). To this was added dry toluene (10 mL). The pressure tube was sealed under nitrogen and stirred at 100 C for 72 h. After 72 h, the pressure tube was cooled to rt and toluene was removed in vacuo. Subsequently, the reaction was quenched with water and the organic contents were extracted with chloroform. The combined extract was dried over anhyd Na2SO4 and filtered. The solvent was removed in vacuo and the crude product was subjected to silica gel column chromatography using CHCl3/pet.ether (5:95) as an eluent to yield pure 9-(N-phenylamino)anthracene as yellow crystalline solid (0.36 g, 70% yield); mp 145 C; IR (neat film) cm1 3392, 1601, 1499, 1421, 1355, 1307; 1H NMR (CDCl3, 500 MHz) d 5.99 (s,1H), 6.59 (d, J = 8.0 Hz, 2H), 6.78 (t, J = 6.8 Hz, 1H), 7.14(t, J = 7.4 Hz, 2H), 7.44-7.48 (m, 4H), 8.05 (d, J = 8.6 Hz,2H), 8.19 (d, J = 8.6 Hz, 2H), 8.41 (s, 1H); 13C NMR (CDCl3, 125 MHz) d 113.8, 118.4, 123.8, 125.3, 125.4, 125.8,128.7, 129.0, 129.2, 132.2, 132.4, 147.9; EI-MS+ m/z Calcdfor C20H15N 269.1204 [M+], found 269.1206. |