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Chemical Synthesis of Sorafenib Tosylate (Nexavar)
2015-05-10 07:05:54

(brand name :Nexavar®, other name BAY 43-9006, Chinese name: 多吉美, 索拉非尼, 蕾莎瓦) wasapproved by US FDA for the treatment of kidney cancer in 2005 and advanced liver cancer in 2007.

Chemical Synthesis of  Sorafenib Tosylate (Nexavar)  多吉美, 索拉非尼的化学合成

US Patent US7235576, WO2006034796, WO2009111061 and Faming Zhuanli Shenqing(CN102311384) disclosed processes for preparation of sorafenib base and its salt sorafenib tosylate.

References 参考文献

1)Bernd Riedl, Jacques Dumas, Uday Khire, Timothy B. Lowinger, William J. Scott, Roger A. Smith, Jill E. Wood, Mary-Katherine Monahan, Reina Natero, Joel Renick, Robert N. Sibley; Omega-carboxyaryl substituted diphenyl ureas as raf kinase inhibitors; US patent number US7235576
2)Rossetto, pierluigi; Macdonald, peter, lindsay; Canavesi, augusto; Process for preparation of sorafenib and intermediates thereof, PCT Int. Appl., WO2009111061
3)Lögers, michael; gehring, reinhold; kuhn, oliver; matthäus, mike; mohrs, klaus; müller-gliemann, matthias; stiehl, jürgen; berwe, mathias; lenz, jana; heilmann, werner; Process for the preparation of 4-{4-[({[4-chloro-3-(trifluoromethyl)phenyl]amino}carbonyl)amino]phenoxy}-n-methylpyridine-2-carboxamide, PCT Int. Appl.,WO2006034796
4)施凯翔,刘清维,谢幼容,索拉非尼的制备方法, 发明专利申请 公开号CN102311384, 申请号CN201010212039
5)赵乘有,陈林捷,许煦,罗晓燕,冀亚飞; 对甲苯磺酸索拉非尼的合成,中国医药工业杂志, 2007(9): 614-616

Full Experimental Details for the preparation of Sorafenib Tosylate (Nexavar) 

Synthesis of 4-(2-(N-methylcarbamoyl)-4-pyridyloxy)aniline.

A solution of 4-aminophenol (9.60 g, 88.0 mmol) in anh. DMF (150 mL) was treated with potassium tert-butoxide (10.29 g, 91.7 mmol), and the reddish-brown mixture was stirred at room temp. for 2 h. The contents were treated with 4-chloro- N -methyl-2-pyridinecarboxamide (15.0 g, 87.9mmol) and K2CO3 (6.50 g, 47.0 mmol) and then heated at 80°C. for 8 h. The mixture was cooled to room temp. and separated between EtOAc (500 mL) and a saturated NaCl solution (500 mL). The aqueous phase was back-extracted with EtOAc (300 mL). The combined organic layers were washed with a saturated NaCl solution (4×1000 mL), dried (Na2SO4) and concentrated under reduced pressure. The resulting solids were dried under reduced pressure at 35°C. for 3 h to afford 4-(2-(N-methylcarbamoyl)-4-pyridyloxy)aniline as a light-brown solid 17.9 g, 84%):. 1H-NMR (DMSO-d6) δ 2.77 (d, J = 4.8 Hz, 3H), 5.17 (br s, 2H), 6.64, 6.86 (AA’BB’ quartet, J = 8.4 Hz, 4H), 7.06 (dd, J = 5.5, 2.5 Hz, 1H), 7.33 (d, J = 2.5 Hz, 1H), 8.44 (d, J = 5.5 Hz; 1H), 8.73 (br d, 1H); HPLC ES-MS m/z 244 ((M+H)+).

Synthesis of 4-{4-[({[4-Chloro-3-(trifluoromethyl)phenyl]amino}carbonyl)amino]phenoxy}-N-methylpyridine-2-carboxamide (sorafenib)

4-(4-Aminophenoxy)-N-methyl-2-pyridinecarboxamide (52.3 kg, 215 mol) is suspended in ethyl acetate (146 kg) and the suspension is heated to approx. 40° C. 4-Chloro-3-trifluoromethylphenyl isocyanate (50 kg, 226 mol), dissolved in ethyl acetate (58 kg), is then added to such a degree that the temperature is kept below 60° C. After cooling to 20° C. within 1 h, the mixture is stirred for a further 30 min and the product is filtered off. After washing with ethyl acetate (30 kg), the product is dried under reduced pressure (50° C., 80 mbar). 93 kg (93% of theory) of the title compound are obtained as colorless to slightly brownish crystals. m.p. 206-208° C. 1H-NMR (DMSO-d6, 500 MHz): δ =2.79 (d, J=4.4 Hz, 3H, NCH3); 7.16 (dd, J=2.5, 5.6 Hz, 1H, 5-H); 7.18 (d, J=8.8 Hz, 2H, 3′-H, 5′-H); 7.38 (d, J=2.4 Hz, 1H, 3-H); 7.60-7.68 (m, 4H, 2′-H, 6′-H, 5″-H, 6″-H); 8.13 (d, J=1.9 Hz, 1H, 2″-H); 8.51 (d, J=5.6 Hz, 1H, 6-H); 8.81 (d, J=4.5 Hz, 1H, NHCH3); 9.05 (br. s, 1H, NHCO); 9.25 (br. s, 1H, NHCO) MS (ESI, CH3CN/H2O): m/e=465 [M+H]+.

Synthesis of Sorafenib Tosylate (Nexavar)

4-(4-{3-[4-chloro-3-(trifluoromethyl)phenyl]ureido}phenoxy)-N2-methylpyridine-2-carboxamide (sorafenib) (50g, 0.1076 mol) is suspended in ethyl acetate (500 g) and water (10g). The mixture is heated to 69°C within 0.5 h, and a filtered solution of p-toluenesulfonic acid monohydrate (3.26 g, 0.017 mol) in a mixture of water (0.65 g) and ethyl acetate (7.2 g) is added. After filtration a filtered solution of p-toluenesulfonic acid monohydrate (22g, 0.11 mol) in a mixture of ethyl acetate (48 g) and water (4.34 g) is added. The mixture is cooled to 23°C within 2 h. The product is filtered off, washed twice with ethyl acetate (92.5 g each time) and dried under reduced pressure. The sorafenib tosylate (65.5 g, 96% of theory) is obtained as colorless to slightly brownish crystals.

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