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CAS No. : | 201733-56-4 | MDL No. : | MFCD02093062 |
Formula : | C10H20B2O4 | Boiling Point : | No data available |
Linear Structure Formula : | (BO2C2H4C(CH3)2)2 | InChI Key : | MDNDJMCSXOXBFZ-UHFFFAOYSA-N |
M.W : | 225.89 | Pubchem ID : | 2734316 |
Synonyms : |
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Chemical Name : | 5,5,5',5'-Tetramethyl-2,2'-bi(1,3,2-dioxaborinane) |
Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | |
Hazard Statements: | H315-H319-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 |
---|---|---|
With potassium acetate;dichloro(1,1'-bis(diphenylphosphanyl)ferrocene)palladium(II)*CH2Cl2; In ethanol; for 20h;Heating / reflux; | [306] 4-Iodo-7-Azaindole (1.0Og, 4.12mmol), bis(neopentylglycolato)diboron (1.49g, 6.59mmol), potassium acetate (0.65g, 6.59mmol), and l,r-bis(diphenylphosphino)ferrocene dichloro palladium (II) dichloromethane complex (0.09g, 0.12mmol) were added to a round bottom flask. The flask was evacuated and backfilled with N2 (3 x). Anhydrous ethanol (2OmL) was added and the mixture was heated to reflux for 2Oh. After cooling to rt, the reaction mixture was diluted with diethyl ether (35mL) and then filtered through celite. The resulting filtrate was concentrated in vacuo and dissolved in ethyl acetate (5OmL). The solution was washed with water (15mL), brine (15mL), and dried over MgSO4. The filtrate was concentrated to a brown solid which was recrystallized with ethyl acetate to yield the title compound as a tan solid. The mother liquor was concentrated in vacuo and purified by column chromatography (HexanesrEtOAc = 80:20 ? 60:40) to yield the title compound. 1H NMR (400 MHz, DMSO-d6) delta 0.99 (s, 6H), 3.83 (s, 4H), 6.69 (dd, IH3 J= 1.8, 1.0 Hz), 7.30 (d, IH, J = 2.4 Hz), 7.45 (dd, IH3 J= 2.8, 2.4 Hz), 8.18 (d, IH, J= 2.2 Hz), 11.52 (bs, IH). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
76% | With (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; potassium acetate; In 1,4-dioxane; at 110℃; for 2h;Inert atmosphere; | A mixture of 5,5,5',5'-tetramethyl-2,2'-bi(1,3,2-dioxaborinane) (16.50 g, 48.33 mmol), oven dried potassium acetate (20.03 g, 204.1 mmol), and <strong>[19936-14-2]1-(4-bromophenyl)cyclobutanol</strong> (10.00 g, 44.03 mmol) in 1,4-dioxane (120 mL) was degassed with N2 for 15 min, then treated with [1,1'-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (2.44 g, 2.99 mmol). The reaction mixture was heated to 110 C. and stirred for 2 hours under N2. The reaction mixture was cooled to room temperature and filtered through celite, eluting with EtOAc. The filtrate was evaporated to give a black oil, which was purified by flash chromatography (0-50% EtOAc/Heptane) three times to afford the title compound (8.68 g, 76%) as a white solid. GC/MS: 259. 1H NMR (400 MHz, CD3Cl) delta 7.83 (d, J=8.05 Hz, 2H), 7.50 (d, J=8.29 Hz, 2H), 3.78 (s, 4H), 2.65-2.52 (m, 2H), 2.38-2.42 (m, 2H), 1.98-2.03 (m, 1H), 1.72-1.80 (m, 1H), 1.03 (s, 6H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
53% | Step 1 : To a degassed solution of compound 35 (350 mg, 0.99 mmol), bis(neopentylglycolato)diboron (289 mg, 1.3 mmol) and KOAc (339 mg, 3.4 mmol) in DMSO (10 mL) was added Pd(dppf)CI2 (80 mg, 0.1 mmol). The resulting mixture was stirred at 75 C for 1 h. LCMS analysis indicated that the boronic acid intermediate was formed. After cooling to RT, compound 59 (31 1 mg, 1.03 mmol) and NaHC03 (aq) (1 M solution, 3.0 mL, 3.0 mmol) and dioxane (10 mL) were added. The mixture was degassed, followed by the addition of Pd(dppf)CI2 (80 mg, 0.1 mmol). The resulting mixture was stirred at 80 C for 2 hours and concentrated in vacuo, ethyl acetate (100 mL) and water (150 mL) were added and then partitioned. The aqueous was extracted with EtOAc (2 x 100 mL), and the combined organic layers were washed with brine (400 mL), dried over MgS04, and then concentrated in vacuo. Purification by flash column chromatography over silica gel, which was eluted with 1 % MeOH and 10% heptane in DCM, gave compound 355 as a yellow solid (260 mg, 53% yield). 1 H NMR (400 MHz, CDCI3) δ 8.06 (dd, 1 H), 7.66 (s, 1 H), 7.16 - 7.30 (m, 5 H), 7.05 (ddd, 1 H), 6.86 (d, 1 H), 5.53 (s, 2 H), 4.80 (br s, 2H), 4.33 (br s, 2 H), 3.96 (s, 3 H), 2.63 (br d, 3 H), 1.42 (br d, 9 H). LCMS ES m/z 440 [M-'Bu]+. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
68% | Under nitrogen protection, 550 mL of dioxane and <strong>[52092-47-4]2-nitro-5-chloropyridine</strong> (15.8 g, were added to the reaction flask in turn. 0.10 mol), neopentyl glycol diborate (22.6 g, 0.10 mol), potassium acetate (14.7 g, 0.15 mol), after stirring uniformly, finally adding catalyst PdCl2dppf (0.74 g, 0.001 mol), slowly heating to 80 -90 ° C, Stir the reaction for 2-3 h. After the end of the GC reaction, the reaction was stopped by cooling, and the reaction solution was filtered through celite to obtain a dark-black reaction solution. After charging at 3 atm of hydrogen, the reaction was carried out at room temperature overnight. After the reaction was completed, the activated carbon was decolorized, and the filtrate was distilled under reduced pressure until no liquid was poured. / heptane mixed solvent was cooled and beaten for half an hour, filtered to obtain an off-white product, heated again with ethanol, and then cooled down, and the filter cake was rinsed with -20 ° C anhydrous ethanol, and dried to obtain an off-white solid 14.0 g. 68percent, HPLC purity 98.9percent |
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