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CAS No. : | 101385-93-7 | MDL No. : | MFCD01631194 |
Formula : | C9H15NO3 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | JSOMVCDXPUXKIC-UHFFFAOYSA-N |
M.W : | 185.22 | Pubchem ID : | 471360 |
Synonyms : |
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Signal Word: | Danger | Class: | |
Precautionary Statements: | P261-P264-P270-P271-P280-P301+P312+P330-P302+P352-P304+P340+P312-P305+P351+P338+P310-P332+P313-P403+P233-P405-P501 | UN#: | |
Hazard Statements: | H302-H315-H318-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 |
---|---|---|
92% | at 20℃; for 1 h; Inert atmosphere | To an ice-cold solution of tert-butyl 3-oxopyrrolidine-1-carboxylate (1.0 g, 5.40 mmol) in Et2O (20 mL) was added methylmagnesium bromide (3.50 mL, 10.80 mmol.) drop wise under an inert atmosphere. The mixture was stirred at RT for 1 h, then quenched with NH4Cl solution followed by extraction with EtOAc (3*100 mL). The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated in vacuo. Trituration with n-pentane gave i (1.0 g, 92percent). 3-Methylpyrrolidin-3-ol hydrochloride (Precursor 52): To a solution of 4M HCl in 1,4-dioxane (10 mL) at 0° C. was added i (0.850 g, 4.22 mmol) and the mixture stirred for 2 h at RT. |
83.8% | Stage #1: With lithium chloride; zinc(II) chloride In tetrahydrofuran; diethyl ether at -10℃; for 1 h; Stage #2: for 0.5 h; |
(2) Preparation of tert-butyl 3-hydroxy-3-methylpyrrolidine-1-carboxylate To a 30 L reaction kettle was added 4 L dry THF at -10° C. After stirring, to the mixture were added ZnCl2 (118 g, 0.86 mol) and LiCl (402 g, 9.5 mol). After half an hour, to the resulting mixture was slowly added a solution of MeMgBr (3 mol/L) in diethyl ether (6.4 L, 19.2 mol) dropwisely. The stirring was continued for half an hour. To the resulting mixture was slowly added a solution of tert-butyl 3-oxopyrrolidine-1-carboxylate (1600 g, 8.6 mol) in THF dropwisely. After the completion of reaction by HPLC detection, to the system was dropwisely added a saturated NH4Cl solution to quench off the reaction. The reaction was extracted with ethyl acetate. The organic phase was washed with a saturated aqueous NaCl solution, dried over anhydrous sodium sulfate, and evaporated to remove the solvent to produce tert-butyl 3-hydroxy-3-methylpyrrolidine-1-carboxylate as a pale yellow solid (1450 g) in a yield of 83.8percent. |
83.8% | With lithium chloride; zinc(II) chloride In tetrahydrofuran; diethyl ether | (2) Preparation of tert-butyl 3-hydroxy-3-methylpyrrolidine -1-carboxylate To a 30 L reaction kettle was added 4 L dry THF at -10°C. After stirring, to the mixture were added ZnCl2 (118g, 0.86mol) and LiCl (402g, 9.5mol). After half an hour, to the resulting mixture was slowly added a solution of MeMgBr (3mol/L) in diethyl ether (6.4 L, 19.2mol) dropwisely. The stirring was continued for half an hour. To the resulting mixture was slowly added a solution of tert-butyl 3-oxopyrrolidine-1-carboxylate (1600g, 8.6mol) in THF dropwisely. After the completion of reaction by HPLC detection, to the system was dropwisely added a saturated NH4Cl solution to quench off the reaction. The reaction was extracted with ethyl acetate. The organic phase was washed with a saturated aqueous NaCl solution, dried over anhydrous sodium sulfate, and evaporated to remove the solvent to produce tert-butyl 3-hydroxy-3-methylpyrrolidine-1-carboxylate as a pale yellow solid (1450 g) in a yield of 83.8 percent. |
83.8% | With lithium chloride; zinc(II) chloride In tetrahydrofuran; diethyl ether at -10℃; for 0.5 h; | (2) Preparation of tert-butyl 3-hydroxy-3-methylpyrrolidine -1-carboxylate To a 30 L reaction kettle was added 4 L dry THF at -10°C. After stirring, to the mixture were added ZnCl2 (118g, 0.86mol) and LiCl (402g, 9.5mol). After half an hour, to the resulting mixture was slowly added dropwisely a solution of MeMgBr (3mol/L) in diethyl ether (6.4 L, 19.2mol). The stirring was continued for half an hour. To the resulting mixture was slowly added a solution of tert-butyl 3-oxopyrrolidine -1-carboxylate (1600g, 8.6mol) in THF dropwisely. After the completion of reaction by HPLC detection, to the system was dropwisely added a saturated NH4Cl solution to quench off the reaction. The reaction was extracted with ethyl acetate. The organic phase was washed with a saturated aqueous NaCl solution, dried over anhydrous sodium sulfate, and evaporated to remove the solvent to produce tert-butyl 3-hydroxy-3-methylpyrrolidine-1-carboxylate as a pale-yellow solid (1450g) in a yield of 83.8 percent. |
70% | at -78℃; for 4 h; | The solution of (0.070 g, 0.38 mmol) tert-butyl 3-oxopyrrolidine-l- carboxylate in anhydrous THF (2 mL) was cooled to -78°C. Then the solution of 1 M methylmagnesium bromide in butyl ether was added dropwise. The reaction was stirred at - 78°C for 4 h and quenched by water (2 mL). After concentrating the reaction in vacuo, the residue was partitioned between ethyl acetate and water. The aqueous layer was extracted once more with ethyl acetate, and the combined organic layers were washed with brine, dried (MgSO4) and concentrated. The residue was purified by silica flash chromatography (gradient elution, using 1 : 1 hexane-ethyl acetate and ethyl acetate) to provide the title compound (0.054 g, 70percent). |
69% | at 0 - 20℃; for 1 h; | EXAMPLE 310 Synthesis of rac-4-((1-benzyl-3-methylpyrrolidin-3-yl)oxy)-5-chloro-2-fluoro-/\/-(thiazol-4-yl)benzenesulfonamide Step 1. Preparation of rac-te/f-butyl 3-hydroxy-3-methylpyrrolidine-1-carboxylate To a cooled (0 °C) solution of te/f-butyl 3-oxopyrrolidine-1-carboxylate (0.975 g, 5.26 mmol) in anhydrous diethyl ether (20 mL)) was added a 3 M solution of methylmagnesium bromide in diethyl ether (3.50 mL, 10.53 mmol). The reaction was allowed to warm to ambient temperature, stirred for 1 hour, and then cooled to 0 °C and quenched by addition of saturated aqueous ammonium chloride (15 mL). The aqueous layer was separated and extracted with ethyl acetate (3 χ 100 mL). The combined organic phases were washed with brine (50 mL), dried with magnesium sulfate, and filtered. Concentration of the filtrate in vacuo and purification of the residue by column chromatography, eluting with a gradient of 0-40percent of ethyl acetate in hexanes, provided the title compound as a yellowish oil (0.735 g, 69percent yield) H NMR (300 MHz, CDCIs) 3.54-3.44 (m, 2H), 3.42-3.33 (m, 1 H), 3.28-3.20 (m, 1 H), 1.93-1.79 (m, 2H), 1.60-1.56 (m, 1 H), 1.46 (s, 9H), 1.42 (s, 3H); MS (ES+) m/z 202.3 (M + 1). |
105 mg | at 0 - 20℃; for 1 h; | 3.0 M ether solution of methylmagnesium bromide (540 .il, 1.62 mmol) wasadded to a solution of tert-butyl 3-oxopyrrolidine-1-carboxylate (100 mg, 0.540 mmol) in THF (2 ml) at 0 °C and warmed up to rt for 1 hr., quenched with saturated NH4C1 (2 ml), extracted with ethyl acetate (60 ml), washed with water, brine, dried (MgSO4) andconcentrated under reduced pressure to provide tert-butyl 3 -hydroxy-3 -methylpyrrolidine1-carboxylate (105 mg) which was used as such for the next step without purification. ‘H NMR (400MHz, CDC13) ? ppm 3.60 - 3.18 (m, 4H), 1.97 - 1.80 (m, 2H), 1.56 - 1.38 (m, 12H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
64% | With iodine; magnesium In diethyl ether at 0 - 20℃; for 1.5 h; Inert atmosphere | To a stirred suspension of magnesium (2.59 g, 106 mmol, 1.97 equiv) in 50 mL of dry ether were added iodine (catalytic) and methyl iodide (6.7 mL, 108 mmol, 2 equiv) slowly drop wise at 0°C under argon atmosphere. This was added to a solution of tert-butyl 3- oxopyrrolidine-1-carboxylate (10 g, 54 mmol, 1 equiv) in 50 mL of ether at 0°C. The reaction mixture was warmed to room temperature and stirred for 1.5 h. After completion, the reactionwas quenched with saturated ammonium chloride solution at 0 °C and extracted with EtOAc. The combined organic extract was dried over sodium sulfate, filtered and concentrated under reduced pressure. Purification using silica gel column chromatography (20percent EtOAc hexanes) afforded 7.0 g of tert-butyl 3-hydroxy-3-methylpyrrolidine-1-carboxylate (Yield = 64percent). |
48% | Stage #1: With magnesium In diethyl ether Stage #2: at 0 - 20℃; for 1.5 h; Stage #3: With water; ammonium chloride In diethyl ether at 0℃; |
c) tert-Bntyl S-hydroxy-S-methylpyrrolidine-l-carboxylate; Methyl magnesium iodide [prepared from magnesium metal (1.73 g, 0.071 mol) and methyl iodide (4.7 mL, 0.074 mol) in dry ether (50 mL)] was slowly added to the solution of step b) product (6.6 g, 0.036 mol) in dry ether (150 mL) at 0 0C under nitrogen atm. The reaction mixture was slowly warmed to RT and stirred for 1.5 h and after cooling to 0 0C, it was quenched with saturated NH4Cl solution. The two layers were separated and the aqueous layer was extracted with ethyl acetate (3xl00mL). The combined organic layers were washed with brine, dried over Na2SO4 and concentrated. The crude product was purified by column chromatography using 40 percent EtOAc in pet. ether. Yield =3.4 g (48 percent). The product was used directly in step d). |
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