Method for preparing boric acid ester based on hydroboration reaction of aliphatic carboxylic acid
An aliphatic carboxylic acid and hydroboration technology, which is applied in catalytic reactions, chemical instruments and methods, compounds containing elements of Group 3/13 of the periodic table, etc., can solve the problem of high cost, and achieve short reaction time and high yield. , the effect of mild reaction conditions
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Embodiment 1
[0022] Embodiment 1: N-butyllithium catalyzes the hydroboration reaction of acetic acid and pinacol borane
[0023] Under an inert gas atmosphere, add acetic acid (28.6 μL, 0.5 mmol) to the reaction flask after dehydration and deoxygenation treatment, add pinacol borane (290 μL, 2 mmol) with a pipette gun, and finally add 10 μL n-butyl Lithium tetrahydrofuran solution (0.1M) (0.2 mol% dosage, the same below), reacted at room temperature for 15 minutes, exposed the reaction solution to air, and removed the solvent to obtain the product boric acid ester, which was obtained by s-trimethoxybenzene (84.08 mg , 0.5 mmol) as internal standard, with CDCl 3 Dissolved, stirred for 10 minutes, sampled, and NMR. Calculated 1 H yield was 99%. NMR data of the product: 1 H NMR (400 MHz, CDCl 3 ): δ3.88 (q, 2H, CH 2 ), 1.25 (s, 36H, CH 3 ), 1.21 (br s, 3H, CH 3 ).
[0024] When pinacol borane (218 μL, 1.5 mmol), the yield was 95%; when pinacol borane (363 μL, 2.5 mmol), the yield was...
Embodiment 2
[0025] Example 2: n-Butyl Lithium Catalyzed Hydroboration Reaction of Valeric Acid and Pinacol Borane
[0026] Under an inert gas atmosphere, add valeric acid (54.38 μL, 0.5 mmol) to the reaction flask after dehydration and deoxygenation treatment, add pinacol borane (290 μL, 2 mmol) with a pipette gun, and finally add n-butyl The tetrahydrofuran solution of lithium (0.2 mol% dosage) was reacted at room temperature for 15 minutes, the reaction solution was exposed to air, and the solvent was removed to obtain the product borate, with s-trimethoxybenzene (84.12 mg, 0.5 mmol) as internal standard, with CDCl 3 Dissolved, stirred for 10 minutes, sampled, and NMR. Calculated 1 H yield was 92%. NMR data of the product: 1 H NMR (400 MHz, CDCl 3 ): δ 3.81 (t, 2H,OCH 2 ), 1.52-1.56 (m, 2H,CH 2 ), 1.30-1.52 (m, 4H, CH 2 ), 1.28(s, 36H, CH), 0.86(t, 3H, CH 3 ).
Embodiment 3
[0027] Embodiment 3: n-Butyllithium catalyzes the hydroboration reaction of hexanoic acid and pinacol borane
[0028] Under an inert gas atmosphere, add hexanoic acid (62.52 μL, 0.5 mmol) to the reaction flask after dehydration and deoxygenation treatment, add pinacol borane (290 μL, 2 mmol) with a pipette gun, and finally add n-butyl The tetrahydrofuran solution of lithium (0.2 mol% dosage) was reacted at room temperature for 15 minutes, the reaction solution was exposed to air, and the solvent was removed to obtain the product borate, with s-trimethoxybenzene (84.01 mg, 0.5 mmol) as the internal standard, with CDCl 3 Dissolved, stirred for 10 minutes, sampled, and NMR. Calculated 1 H yield was 90%. NMR data of the product: 1 H NMR (400 MHz, CDCl 3 ): δ 3.76 (t, 2H,OCH 2 ), 1.46-1.52 (m, 2H,CH 2 ), 1.24-1.35 (m, 6H, CH 2 ), 1.19 (s, 48H, CH 3 ), 0.82(t, 3H, CH 3 ).
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