ChemicalBook CAS DataBase List Dabrafenib Mesylate

Dabrafenib Mesylate synthesis

6synthesis methods

Product Name:Dabrafenib Mesylate
CAS Number:1195768-06-9
Molecular formula:C24H24F3N5O5S3
Molecular Weight:615.66

Commercially available fluoroaniline 40 was first converted to sulfonamide 42 in 91% yield by treatment with 2,5-difluorobenzenesulfonyl chloride (41) in the presence of pyridine. Next, deprotonation of 2-chloro-4-methylpyrimidine (43) with lithium bis(trimethylsilyl)amide (LHMDS) followed by addition to ester 42 afforded chloropyrimidine 44 in 72% yield. Bromination followed by thiazole formation through the use of 2,2-dimethylpropanethioamide gave the penultimate target 45 in 80% over two steps. Chloropyrimidine 45 was subjected to SNAr conditions with ammonium hydroxide to furnish the aminopyrimidine in 88% yield, and this was followed by exposure to methanesulfonic acid to afford dabrafenib mesylate (VI) in 85% yield.

75-75-2 Synthesis

75-75-2
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1195765-45-7 Synthesis

1195765-45-7
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1195768-06-9
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Yield:1195768-06-9 87%

Reaction Conditions:

in isopropyl alcohol at 20; for 3 h;

Steps:

1 The Preparation of the Known Crystal Form I
Add methylsulfonic acid (0.131 ml, 0.393 mmol) into the isopropanol solution of N-{3-[5-(2-amino-4-pyrimidinyl)-2-(1,1-dimethylethyl)-1,3-thiazol-4-yl]-2-fluorophenyl}-2,6-difluorobenzenesulfonamide (204 mg, 0.393 mmol) and stir the solution at room temperature for 3 h to obtain a white precipitate, filter the slurry and wash it with ethyl ether to obtain N-[3-[5-(2-amino-4-pyrimidinyl)-2-(1,1-dimethylethyl)-1,3-thiazo-4-yl]-2-fluorophenyl]-2,6-difluorobenzenesulfonamide methanesulfonate, which is a white crystals (221 mg, 87% yield).
¹HNMR (400 MHz, DMSO-d6) δ ppm 10.85 (s, 1H) 7.92-8.05 (m, 1H), 7.56-7.72 (m, 1H), 6.91-7.50 (m, 7H), 5.83-5.98 (m, 1H), 2.18-2.32 (m, 3H), 1.36 (s, 9H). j0114] The X-ray powder diffraction pattern of the obtained crystals as shown in FIG. 10 is consistent with that mentioned in the patent documents W02009/137391 or CN200980126781 .6.10115] The DSC thermogram is shown in FIG. 11: the melting range of the Known Crystal Form I is 247° C.250°C.10116] The TGA thermogram is shown in FIG. 12: the decomposition temperature is 261° C.

References:

Hangzhou Pushai Pharmaceutical Technology Co., LTD.;LAO, Haiping;SHENG, Xiaoxia;Sheng, Xiaohong US2016/46615, 2016, A1 Location in patent:Paragraph 0113; 0114; 0115; 0116

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60230-36-6 Synthesis