4,4,4-trifluoro-3-methylsulfanylbutanoic acid

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a 100 mL round bottom flask was added (E)-4,4,4-trifluorobut-2-enoic acid (8 g, 57.1 mmol) and Methanol (24 mL), the solution was stirred in a water bath, then sodium methanethiolate (10.01 g, 143 mmol) was added in three portions. Vigorous bubbling was observed, the mixture was stirred at 25° C. overnight, NMR showed no more starting material. To the reaction mixture was added 2 N HCl until acidic. The mixture was extracted with chloroform (5×50 mL), combined organic layer was dried over Na2SO4, concentrated in vacuo and further dried under high vacuum until there was no weight loss to give 4,4,4-trifluoro-3-(methylthio)butanoic acid (10.68 g, 56.8 mmol, 99% yield) as a colorless oil: 1H NMR (400 MHz, CDCl3) δ 10.88 (s, 1H), 3.53 (dqd, J=10.5, 8.3, 4.0 Hz, 1H), 2.96 (dd, J=16.9, 4.0 Hz, 1H), 2.65 (dd, J=16.9, 10.4 Hz, 1H), 2.29 (s, 3H); 13C NMR (101 MHz, CDCl3) δ 175.78 (s), 126.61 (q, JC-F=278.8 Hz), 44.99 (q, JC-F=30.3 Hz), 34.12 (d, JC-F=1.7 Hz), 15.95 (s); EIMS m/z 162. Vigorous bubbling the mixture was stirred at 25° C. overnight To the reaction mixture was added 2 N HCl until acidic The mixture was extracted with chloroform (5×50 mL) was dried over Na2SO4 concentrated in vacuo further dried under high vacuum until there

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a 100 mL round bottom flask was added (E)-4,4,4-trifluorobut-2-enoic acid (8 g, 57.1 mmol) and Methanol (24 mL), the solution was stirred in a water bath, then sodium methanethiolate (10.01 g, 143 mmol) was added in three portions. Vigorous bubbling was observed, the mixture was stirred at 25° C. overnight, NMR showed no more starting material. To the reaction mixture was added 2 N HCl until acidic. The mixture was extracted with chloroform (5×50 mL), combined organic layer was dried over Na2SO4, concentrated in vacuo and further dried under high vacuum until there was no weight loss to give 4,4,4-trifluoro-3-(methylthio)butanoic acid (10.68 g, 56.8 mmol, 99% yield) as a colorless oil: 1H NMR (400 MHz, CDCl3) δ 10.88 (s, 1H), 3.53 (dqd, J=10.5, 8.3, 4.0 Hz, 1H), 2.96 (dd, J=16.9, 4.0 Hz, 1H), 2.65 (dd, J=16.9, 10.4 Hz, 1H), 2.29 (s, 3H); 13C NMR (101 MHz, CDCl3) δ 175.78 (s), 126.61 (q, JC-F=278.8 Hz), 44.99 (q, JC-F=30.3 Hz), 34.12 (d, JC-F=1.7 Hz), 15.95 (s); EIMS m/z 162. Vigorous bubbling the mixture was stirred at 25° C. overnight To the reaction mixture was added 2 N HCl until acidic The mixture was extracted with chloroform (5×50 mL) was dried over Na2SO4 concentrated in vacuo further dried under high vacuum until there

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a 7 mL vial was added 3-chloro-N-(prop-2-yn-1-yl)-1-(pyridin-3-yl)-1H-pyrazol-4-amine (140 mg, 0.6 mmol), N,N-dimethylpyridin-4-amine (249 mg, 2.040 mmol), N1-((ethylimino)methylene)-N3,N3-dimethylpropane-1,3-diamine hydrochloride (276 mg, 1.440 mmol) followed by 4,4,4-trifluoro-3-(methylthio)butanoic acid (158 mg, 0.840 mmol) and DCE (1.2 mL). The solution was stirred at 25° C. for 18 hours, the crude reaction mixture was concentrated and purified with silica gel chromatography (0-100% EtOAc/hexane) to give the title compound as a brown oil (237 mg, 0.588 mmol, 98%): (IR thin film) 1674 cm−1; 1H NMR (400 MHz, CDCl3) δ 8.97 (d, J=2.6 Hz, 1H), 8.64 (dd, J=4.7, 1.3 Hz, 1H), 8.13 (s, 1H), 8.07 (ddd, J=8.3, 2.7, 1.5 Hz, 1H), 7.48 (ddd, J=8.3, 4.8, 0.5 Hz, 1H), 4.39 (s, 2H), 3.76 (dqd, J=17.2, 8.6, 3.6 Hz, 1H), 2.67 (dd, J=16.6, 3.6 Hz, 1H), 2.46 (dd, J=16.5, 9.9 Hz, 1H), 2.29 (d, J=2.5 Hz, 4H); ESIMS m/z 403 ([M+H]+). the crude reaction mixture was concentrated purified with silica gel chromatography (0-100% EtOAc/hexane)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a 100 mL round bottom flask was added (E)-4,4,4-trifluorobut-2-enoic acid (8 g, 57.1 mmol) and Methanol (24 mL), the solution was stirred in a water bath, then sodium methanethiolate (10.01 g, 143 mmol) was added in three portions. Vigorous bubbling was observed, the mixture was stirred at 25° C. overnight, NMR showed no more starting material. To the reaction mixture was added 2 N HCl until acidic. The mixture was extracted with chloroform (5×50 mL), combined organic layer was dried over Na2SO4, concentrated in vacuo and further dried under high vacuum until there was no weight loss to give 4,4,4-trifluoro-3-(methylthio)butanoic acid (10.68 g, 56.8 mmol, 99% yield) as a colorless oil: 1H NMR (400 MHz, CDCl3) δ 10.88 (s, 1H), 3.53 (dqd, J=10.5, 8.3, 4.0 Hz, 1H), 2.96 (dd, J=16.9, 4.0 Hz, 1H), 2.65 (dd, J=16.9, 10.4 Hz, 1H), 2.29 (s, 3H); 13C NMR (101 MHz, CDCl3) δ 175.78 (s), 126.61 (q, JC-F=278.8 Hz), 44.99 (q, JC-F=30.3 Hz), 34.12 (d, JC-F=1.7 Hz), 15.95 (s); EIMS m/z 162. Vigorous bubbling the mixture was stirred at 25° C. overnight To the reaction mixture was added 2 N HCl until acidic The mixture was extracted with chloroform (5×50 mL) was dried over Na2SO4 concentrated in vacuo further dried under high vacuum until there