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CAS No. : | 614730-97-1 | MDL No. : | MFCD08062513 |
Formula : | C11H20FNO3 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | BWZOULIMVKCGII-UHFFFAOYSA-N |
M.W : | 233.28 | Pubchem ID : | 22248400 |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P280-P305+P351+P338 | UN#: | |
Hazard Statements: | H302-H315-H319-H332-H335 | Packing Group: | |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
73% | With caesium carbonate; In dimethyl sulfoxide; at 80℃; for 4h; | To a mixture of tert-butyl 4-fluoro-4- (hydroxymethyl) piperidine-1-carboxylate (4.60 g, 19.70 mmol) and tert-butyl 5-chloro-2, 4-difluorobenzoate (4.89 g, 19.70 mmol) in dimethyl sulfoxide (50 mL) was added cesium carbonate (9.65 g, 29.60 mmol) and the reaction mixture was heated at 80 for 4 hours. After cooling to an ambient temperature, water (50 mL) was added, and then extracted with ethyl acetate (3 x 100 mL) . The organic layer was washed with brine (2×50 mL) , dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated in vacuo and the residue was purified by silica gel column chromatography eluting with gradient of 0-30 ethyl acetate in hexanes to afford the title compound as a colorless gum (6.60 g, 73) :1H NMR (300 MHz, CDCl3) δ 7.82 (d, J7.6 Hz, 1H) , 6.58 (d, J11.8 Hz, 1H) , 3.90-4.10 (m, 3H) , 3.07 (t, J12.4 Hz, 2H) , 1.98-1.89 (m, 3H), 1.84-1.56 (m, 2H) , 1.51 (s, (H) , 1.40 (s, 9H) MS (ES+) m/z 464.1, 462.1 (M+1) . |
73% | With caesium carbonate; In dimethyl sulfoxide; at 80℃; for 4h;Inert atmosphere; | Step 1 Preparation of tert-butyl 4-((4-(tert-butoxycarbonyl)-2-chloro-5-fluorophenoxy)methyl)-4-fluoropiperidine-1-carboxylate (0419) tert-butyl 4-fluoro-4-(hydroxymethyl)piperidine-1-carboxylate (3.20 g, 13.7 mmol) and <strong>[1354961-13-9]tert-butyl 5-chloro-2,4-difluorobenzoate</strong> (3.40 g, 13.7 mmol) in dimethyl sulfoxide (50 mL) was added cesium carbonate (8.94 g, 27.5 mmol) and the reaction mixture was heated at 80 C. for 4 h. After cooling to an ambient temperature, added water (50 mL) and extracted with ethyl acetate (3×100 mL). The organic layer was washed brine (2×50 mL), dried over anhydrous sodium sulfate and filtered. The solvent was concentrated in vacuo and the residue was purified by silica gel column chromatography using gradient of 0-30% ethyl acetate in hexanes as eluent to afford the title compound as a colorless gum (6.6 g, 73% yield): 1H NMR (300 MHz, CDCl3) δ 7.82 (d, J=7.6 Hz, 1H), 6.58 (d, J=11.8 Hz, 1H), 3.90-4.10 (m, 3H), 3.07 (t, J=12.4 Hz, 2H), 1.98-1.89 (m, 3H), 1.84-1.56 (m, 2H), 1.51 (s, (H), 1.40 (s, 9H); MS (ES+) m/z 464.1, 462.1 (M+1). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
100% | With borane-THF; In tetrahydrofuran; at 0 - 20℃; for 5h; | 1-(tert-Butoxycarbonyl)-4-fluoropiperidine-4-carboxylic acid 13a (5.0 g, 20 mmol) was dissolved in 50 mL of THF.A borane tetrahydrofuran solution (50 mL, 1 M/THF) was added dropwise at 0 C, and the mixture was reacted at room temperature for 5 hours. Slow down in the reaction solution at 0 CThe reaction was quenched by slowly adding 20 mL of methanol. Concentrate under reduced pressure to remove the solvent. Add 50 mL of water and extract with ethyl acetate (50 mL×3).The combined organic layers were washed with EtOAc EtOAc (EtOAc)Fluor-4-(hydroxymethyl)piperidine-1-carboxylic acid tert-butyl ester 13b (4.7 g, colorless oil), yield: 100%. |
98% | With borane-THF; In tetrahydrofuran; for 32h;Reflux; | To a solution of 1- (tert-butoxycarbonyl) -4-fluoropiperidine-4-carboxylic acid (5.00 g, 20.20 mmol) in tetrahydrofuran (100 mL) was added a solution of borane tetrahydrofuran complex (30.3 mL, 30.30 mmol, 1.0 M solution in tetrahydrofuran) . The reaction mixture was refluxed for 16 hours, and then another 24 mL of borane tetrahydrofuran complex was added and continued to reflux for another 16 hours. After cooling to ambient temperature the reaction mixture poured onto ice-cold water (50 mL) and saturated ammonium chloride (100 mL) , and extracted with ethyl acetate (3 x 100 mL) , dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated to afford the title compound (4.60 g, 98) . Which was used in the next step without further purification: MS (ES+) m/z 234.1 (M +1) . |
With borane-THF; In tetrahydrofuran; for 32h;Reflux; Inert atmosphere; | Step 1. Preparation of tert-Butyl 4-fluoro-4-(hydroxymethyl)piperidine-1-carboxylate (0341) <strong>[614731-04-3]1-(tert-butoxycarbonyl)-4-fluoropiperidine-4-carboxylic acid</strong> (5.00 g, 20.20 mmol) in tetrahydrofuran (100 mL) was added a solution of borane tetrahydrofuran complex (30.3 mL, 30.30 mmol, 1.0 M solution in tetrahydrofuran). The reaction mixture was refluxed for 16 hours, and then another 24 mL of borane tetrahydrofuran complex was added and continued to reflux for another 16 hours. After cooling to ambient temperature the reaction mixture poured onto ice-cold water (50 mL) and saturated ammonium chloride (100 mL), and extracted with ethyl acetate (3×100 mL), dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated to afford the title compound (4.60 g, 98%). Which was used in the next step without further purification: MS (ES+) m/z 234.1 [M+H]+. |
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