WO2020113835A1 - 一种由羧酸无催化硼氢化反应制备硼酸酯的方法 - Google Patents
一种由羧酸无催化硼氢化反应制备硼酸酯的方法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
- C07B41/00—Formation or introduction of functional groups containing oxygen
- C07B41/02—Formation or introduction of functional groups containing oxygen of hydroxy or O-metal groups
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- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/09—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by hydrolysis
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/09—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by hydrolysis
- C07C29/095—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by hydrolysis of esters of organic acids
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/01—Preparation of ethers
- C07C41/18—Preparation of ethers by reactions not forming ether-oxygen bonds
- C07C41/26—Preparation of ethers by reactions not forming ether-oxygen bonds by introduction of hydroxy or O-metal groups
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- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
- C07F5/02—Boron compounds
- C07F5/04—Esters of boric acids
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- C07C2602/04—One of the condensed rings being a six-membered aromatic ring
- C07C2602/08—One of the condensed rings being a six-membered aromatic ring the other ring being five-membered, e.g. indane
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- the invention relates to the application field of green chemistry, in particular to the hydroboration reaction of carboxylic acid without solvent and catalyst.
- the organoborate can be regarded as a derivative in which hydrogen in orthoboric acid B(OH) 3 is replaced by an organic group, and in addition, metaborate (ROBO) 3 . Because of its stability and low toxicity, borate is widely used in various fields. It is a main raw material for the synthesis of boron-containing compounds. Borate ester compounds can be used not only as rust inhibitors, preservatives, polymer additives, anti-wear additives, automotive brake fluids, gasoline additives, flame retardants in cleaning agents, but also as lubricant additives.
- the reduction catalytic system reported in the literature on the synthesis of borate esters mainly uses LiAlH 4 and NaBH 4 , SmI 2 -H 2 O-Et 3 N and various transition metal complex catalysts to catalyze the hydroboration of carboxylic acids.
- LiAlH 4 and NaBH 4 systems have a high security risk
- SmI 2 -H 2 O-Et 3 N system requires a lot of excess reagents, Ru, Rh, Ir, Co transition metal complex system Requires high temperature and high pressure.
- the difference between the nucleophilic addition reaction of carboxylic acid and aldehyde ketone (1) The active hydrogen of carboxylic acid is easy to leave, so its two O are actually equivalent, so from the perspective of spatial structure, the steric hindrance of carboxyl group Large, and the existence of carboxyl hydrogen bond makes the density of the electron cloud of the entire carbonyl group larger, and it is more difficult for the nucleophile to attack the active center; (2) The nucleophile advances to attack the carbonyl carbon. Small advanced attacks, such as aldehydes and ketones have a lower electron cloud density than esters and amides, so they have high activity and will preferentially react.
- the purpose of the invention of the present invention is to provide a method that complies with the principles of green chemistry.
- the borohydride of carboxylic acid is used to reduce pinacol borane to form a borate ester, and then alcohol. This method is green and environmentally friendly and has a good substrate application range.
- a method for preparing boric acid ester from borohydration reaction of carboxylic acid includes the following steps: without solvent and without catalyst, carboxylic acid and borane are subjected to hydroboration reaction to prepare boric acid ester.
- a method for preparing an alcohol compound from a carboxylic acid includes the following steps: without a solvent and without a catalyst, the carboxylic acid and borane undergo a hydroboration reaction; after the hydroboration reaction is completed, silica gel and methanol are added to hydrolyze the alcohol compound.
- the borane is pinacol borane;
- the carboxylic acid is benzoic acid, 4-bromobenzoic acid, 4-fluorobenzoic acid, 1-naphthoic acid, 2-methoxybenzoic acid, 4-tert-butylbenzoic acid, 4-ethoxybenzoic acid, 2-bromobenzoic acid, 4-iodobenzoic acid, 3-phenylpropionic acid, diphenylacetic acid, 2-phenylbutyric acid, indole-3 -Acetic acid, o-carboxyphenylacetic acid, 2-methyl-5-bromobenzoic acid, acetic acid, hexanoic acid, valeric acid, heptanoic acid, trimethylacetic acid, adipic acid, etc.
- the molar ratio of the carboxylic acid to borane is 1:3 to 1:7.
- the temperature of the hydroboration reaction is room temperature and the time is 6-12 hours; preferably, when the carboxylic acid is acetic acid, hexanoic acid, valeric acid, heptanoic acid, trimethylacetic acid or adipic acid,
- the borohydride reaction time is 8 to 10 hours.
- the conditions of the hydrolysis reaction are reaction at 50°C for 3 hours; the ratio of the amount of carboxylic acid to silica gel and methanol is 1 mmoL: 2 g: 5 mL to 6 mL; , Trimethylacetic acid or adipic acid, the ratio of carboxylic acid to silica gel, methanol is 1mmoL: 2g: 5mL, when the carboxylic acid is benzoic acid, 4-bromobenzoic acid, 4-fluorobenzoic acid, 1-naphthoic acid , 2-methoxybenzoic acid, 4-tert-butylbenzoic acid, 4-ethoxybenzoic acid, 2-bromobenzoic acid, 4-iodobenzoic acid, 3-phenylpropionic acid, diphenylacetic acid, 2- When phenylbutyric acid, indole-3-acetic acid, o-carboxyphenylacetic acid or 2-methyl-5-bromobenzoic acid,
- the borane and carboxylic acid are stirred and mixed uniformly; the reaction is 6 to 12 hours; after the reaction is completed, the reaction is stopped by contacting with air to obtain a borate ester.
- the present invention has the following advantages compared with the prior art:
- the present invention can carry out the hydroboration reaction of carboxylic acid and pinacol borane for the first time without solvent and catalyst, thereby developing an efficient and green method for preparing alkyl borate.
- the invention can carry out the hydroboration reaction of carboxylic acid and borane with high activity at room temperature.
- the reaction can be carried out for 6 to 12 hours, and the conversion rate can reach more than 90%.
- Solvents and catalysts can achieve very high conversion rates.
- the solvent-free catalystless carboxylic acid borohydride disclosed in the present invention has a wide range of applications for substrates, and is suitable for carboxylic acids with different substituent positions and different electronic effects, providing more choices for the industrial synthesis of borate esters; And the reaction process is simple and controllable, the yield is high, the product post-processing is easy, and it is suitable for industrial production.
- FIG. 1 is a schematic diagram of the reaction in Example 1
- Example 2 is a schematic diagram of the reaction of Example 18.
- Example One 3:1 molar ratio of pinacol borane to benzoic acid to form borate
- Example 2 4:1 molar ratio of pinacol borane to benzoic acid to form borate
- Example 3 4:1 molar ratio of pinacol borane to benzoic acid to form borate
- Example 5 4:1 molar ratio of pinacol borane to 4-fluorobenzoic acid to form borate
- Example 6 4:1 molar ratio of pinacol borane to 4-bromobenzoic acid to form borate
- Example 7 4:1 molar ratio of pinacol borane to 2-methoxybenzoic acid to form borate
- Example 8 4:1 molar ratio of pinacol borane to 1-naphthoic acid to form borate
- Example 10 4:1 molar ratio of pinacol borane and 2-bromobenzoic acid to form borate
- Example 11 4:1 molar ratio of pinacol borane to 4-iodobenzoic acid to form borate
- Example 12 4:1 molar ratio of pinacol borane and 3-phenylpropionic acid to form borate
- Example 13 4:1 molar ratio of pinacol borane to diphenylacetic acid to form borate
- Example 14 4:1 molar ratio of pinacol borane and 2-methyl-5-bromo-benzoic acid to form borate
- Example 15 4:1 molar ratio of pinacol borane to 2-phenylbutyric acid to form borate
- Example 16 5:1 molar ratio of pinacol borane to indole-3-acetic acid to form borate
- Example 17 7:1 molar ratio of pinacol borane to o-carboxyphenylacetic acid to form borate ester
- Example 18 4:1 molar ratio of pinacol borane to acetic acid
- Example 19 4:1 molar ratio of pinacol borane to valeric acid
- valeric acid 54.38 ⁇ L, 0.5 mmol
- pinacol borane 290 ⁇ L, 2 mmol
- trimethoxybenzene 84.12 mg, 0.5 mmol
- silica gel Add 1g of silica gel to the sampling residue, use 2.5mL of methanol as the solvent, react at 50°C for 3h, further hydrolyze the borate ester to alcohol, after the reaction is completed, extract three times with ethyl acetate, combine the organic layers, use anhydrous sulfuric acid Dry with sodium, remove the solvent under reduced pressure, and purify by silica gel (100-200 mesh) column chromatography using ethyl acetate/hexane (1:5) mixture as eluent to obtain pure primary alcohol with an isolated yield of 87 %.
- Example 20 4:1 molar ratio of pinacol borane to caproic acid
- silica gel Add 1g of silica gel to the sampling residue, use 2.5mL of methanol as the solvent, react at 50°C for 3h, further hydrolyze the borate ester to alcohol, after the reaction is completed, extract three times with ethyl acetate, combine the organic layers, use anhydrous sulfuric acid Dry with sodium, remove the solvent under reduced pressure, and purify by silica gel (100-200 mesh) column chromatography using ethyl acetate/hexane (1:5) mixture as eluent to obtain pure primary alcohol with an isolated yield of 83 %.
- Example 21 4:1 molar ratio of pinacol borane to heptanoic acid
- silica gel Add 1g of silica gel to the sampling residue, use 2.5mL of methanol as the solvent, react at 50°C for 3h, further hydrolyze the borate ester to alcohol, after the reaction is completed, extract three times with ethyl acetate, combine the organic layers, use anhydrous sulfuric acid Dry with sodium, remove the solvent under reduced pressure, and purify by silica gel (100-200 mesh) column chromatography using ethyl acetate/hexane (1:5) mixture as eluent to obtain pure primary alcohol with an isolated yield of 82 %.
- Example 22 4:1 molar ratio of pinacol borane to trimethyl acetic acid
- Example 23 7:1 molar ratio of pinacol borane to adipic acid
- silica gel Add 1g of silica gel to the sampling residue, use 2.5mL of methanol as the solvent, react at 50°C for 3h, further hydrolyze the borate ester to alcohol, after the reaction is completed, extract three times with ethyl acetate, combine the organic layers, use anhydrous sulfuric acid Dry with sodium, remove the solvent under reduced pressure, and purify by silica gel (100-200 mesh) column chromatography using ethyl acetate/hexane (1:5) mixture as eluent to obtain pure primary alcohol with an isolated yield of 91 %.
- Example 24 3:1 molar ratio of pinacol borane to acetic acid
- Example 25 5:1 molar ratio of pinacol borane to acetic acid
- NMR data of the product 1H NMR (400 MHz, CDCl3): ⁇ 3.89 (q, 2H, CH2), 1.26 (s, 36H, CH3), 1.22 (br s, 3H, CH3).
- Add 1g of silica gel to the sampling residue use 2.5mL of methanol as the solvent, react at 50°C for 3h, further hydrolyze the borate ester to alcohol, after the reaction is completed, extract three times with ethyl acetate, combine the organic layers, use anhydrous sulfuric acid Dry with sodium, remove the solvent under reduced pressure, and purify by silica gel (100-200 mesh) column chromatography using ethyl acetate/hexane (1:5) mixture as eluent to obtain pure primary alcohol with an isolated yield of 92 %.
- Nuclear magnetic data of the product 1H NMR (400 MHz, CDCl3): ⁇ 3.69 (q, 2H, CH2), 2.92 (br s, 1H, OH), 1.
- the borate ester was further hydrolyzed to alcohol, 60 g of silica gel was added to the sampling residue, 180 mL of methanol was used as the solvent, and the reaction was carried out at 50° C. for 3 h. After the reaction was completed, it was extracted three times with ethyl acetate. The organic layers were combined and dried over anhydrous sodium sulfate. Dry, remove the solvent under reduced pressure, and purify by silica gel (100-200 mesh) column chromatography using ethyl acetate/hexane (1:5) mixture as eluent to obtain pure primary alcohol with an isolated yield of 91% .
- Nuclear magnetic data of the product 1H NMR (400 MHz, CDCl3): ⁇ 7.22– 7.29 (m, 5H, ArH), 4.61 (s, 2H, CH2), 1.87 (br s, 1H, OH).
- the reaction of the embodiment of the present invention is carried out in a glove box; carboxylic acid is generally solid, aliphatic carboxylic acid is generally liquid, the reaction of carboxylic acid and pinacol borane is a heterogeneous reaction, aliphatic carboxylic acid and pina
- the reaction of alcohol borane is a homogeneous reaction.
- the present invention is a borohydride reaction of carboxylic acid without solvent and without catalyst, which complies with the principles of green chemistry.
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Abstract
本发明公开了一种由羧酸无催化硼氢化反应制备硼酸酯的方法。惰性气体氛围中,在经过脱水脱氧处理的反应瓶中将频哪醇硼烷和羧酸搅拌混合均匀,反应6-12小时后得到硼酸酯,然后加入硅胶、甲醇,水解反应制备醇化合物;所述羧酸为乙酸、己酸、戊酸、庚酸、三甲基乙酸、己二酸、苯甲酸、4-溴苯甲酸、4-氟苯甲酸、1-萘甲酸、2-甲氧基苯甲酸、4-叔丁基苯甲酸、4-乙氧基苯甲酸、2-溴苯甲酸、4-碘苯甲酸、3-苯丙酸、二苯基乙酸、2-苯基丁酸、吲哚-3-乙酸、邻羧基苯乙酸或者2-甲基-5-溴苯甲酸。本发明首次在无催化剂条件下利用羧酸高效地与硼烷发生硼氢化反应,为羰基化合物与硼烷发生硼氢化反应制备硼酸酯提供了新的方案。
Description
本发明涉及绿色化学的应用领域,具体涉及无溶剂无催化剂下羧酸的硼氢化反应。
有机硼酸酯可看作是正硼酸B(OH)
3中的氢被有机基团取代后的衍生物,此外还有偏硼酸酯(ROBO)
3。由于硼酸酯的稳定性和低毒性,被广泛应用于各个领域,它是合成含硼化合物的一种主要原料。硼酸酯类化合物不仅可以作为清洗剂中的防锈剂、防腐剂、聚合物添加剂、抗磨添加剂、汽车制动液、汽油添加剂、阻燃剂使用,而且可以用作润滑油添加剂等。
目前文献上报道的关于合成硼酸酯的还原催化体系主要是利用LiAlH
4和NaBH
4,SmI
2-H
2O-Et
3N以及各种过渡金属配合物催化剂催化的羧酸硼氢化。但是,这些方法都有明显的缺点:LiAlH
4和NaBH
4体系安全风险很大,SmI
2-H
2O-Et
3N体系需要过量很多的试剂,Ru、Rh、Ir、Co过渡金属配合物体系需要高温及高压下进行。羧酸和醛酮亲核加成反应活性区别:(1)羧酸的活泼氢易离去,因此它的两个O实际上是等价的,所以从空间结构来看,羧基的位阻较大,并且羧基氢键的存在,使整个羰基的电子云密度较大,亲核试剂进攻活性中心比较难;(2)亲核试剂先进攻羰基碳,这个与碳上的电子云密度有关,密度小的先进攻,比如醛酮比酯、酰胺的电子云密度更小,所以活性高,会优先反应,空间效应大的不易反应;(3)形成过渡态的时候要看离去基团,醛酮的离去基团是烷基及氢,二者都不易离去,所以醛酮只发生加成,不发生消除,不同于羧酸及其衍生物。现有方法一方面要利用较难合成的催化剂,成本高;另一方面,催化反应需要60℃的反应温度以及24小时的反应时间。
本发明的发明目的是提供一种符合绿色化学原则的方法,在无溶剂无催化剂中,利用羧酸的硼氢化还原频哪醇硼烷生成硼酸酯,进而生成醇。该方法绿色环保,有很好的底物适用范围。
为达到上述目的,本发明采用的技术方案是:
一种由羧酸的硼氢化反应制备硼酸酯的方法,包括以下步骤,无溶剂、无催化剂下,羧酸与硼烷进行硼氢化反应制备硼酸酯。
一种由羧酸制备醇化合物的方法,包括以下步骤,无溶剂、无催化剂下,羧酸与硼烷进行硼氢化反应;硼氢化反应结束后加入硅胶、甲醇,水解反应制备醇化合物。
羧酸与硼烷作为原料在制备硼酸酯或者醇化合物中的应用,所述应用在无催化剂下进行。
上述技术方案中,所述的硼烷为频哪醇硼烷;所述羧酸为苯甲酸、4-溴苯甲酸、4-氟苯甲酸、1-萘甲酸、2-甲氧基苯甲酸、4-叔丁基苯甲酸、4-乙氧基苯甲酸、2-溴苯甲酸、4-碘苯甲酸、3-苯丙酸、二苯基乙酸、2-苯基丁酸、吲哚-3-乙酸、邻羧基苯乙酸、2-甲基-5-溴苯甲酸、乙酸、己酸、戊酸、庚酸、三甲基乙酸、己二酸等。
上述技术方案中,所述羧酸和硼烷的摩尔比为 1:3~1:7。
上述技术方案中,所述硼氢化反应的温度为室温,时间为6~12小时;优选的,当羧酸为乙酸、己酸、戊酸、庚酸、三甲基乙酸或者己二酸时,硼氢化反应的时间为8~10小时。
本发明中,水解反应的条件为50℃下反应3h;羧酸与硅胶、甲醇的用量比为1mmoL:2g: 5mL~6mL;优选的,当羧酸为乙酸、己酸、戊酸、庚酸、三甲基乙酸或者己二酸时,羧酸与硅胶、甲醇的用量比为1mmoL:2g: 5mL,当羧酸为苯甲酸、4-溴苯甲酸、4-氟苯甲酸、1-萘甲酸、2-甲氧基苯甲酸、4-叔丁基苯甲酸、4-乙氧基苯甲酸、2-溴苯甲酸、4-碘苯甲酸、3-苯丙酸、二苯基乙酸、2-苯基丁酸、吲哚-3-乙酸、邻羧基苯乙酸或者2-甲基-5-溴苯甲酸时,羧酸与硅胶、甲醇的用量比为1mmoL:2g:
6mL。
上述技术方案中,由羧酸的硼氢化反应制备硼酸酯的方法具体步骤为:
惰性气体氛围下,将硼烷和羧酸搅拌混合均匀;反应6~12小时;反应结束后接触空气中止反应,得到硼酸酯。
由羧酸制备醇化合物的方法具体步骤为:
惰性气体氛围下,将硼烷和羧酸搅拌混合均匀;反应6~12小时;反应结束后接触空气中止反应,然加入硅胶、甲醇,50℃下水解反应3h,水解反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5体积比)混合物作为洗脱剂,得到醇化合物。
由于上述技术方案运用,本发明与现有技术相比具有下列优点:
1.本发明首次在无溶剂和无催化剂下就可进行羧酸与频哪醇硼烷的硼氢化反应,从而开发出一种高效绿色的制备烷基硼酸酯的方法。
2.本发明可以在室温条件下高活性的进行羧酸和硼烷的硼氢化反应,反应进行6~12小时,可达到90%以上的转化率,与已有的催化体系相比,未使用溶剂和催化剂就可以达到很高的转化率。
3.本发明公开的无溶剂无催化剂羧酸的硼氢化对底物的适用范围宽,适用于不同取代基位置、不同电子效应的羧酸,为硼酸酯的工业化合成提供了更多选择;并且反应过程简单可控,收率高,产物后处理容易,适合工业化生产。
图1为实施例一反应示意图
图2为实施例十八反应示意图。
下面结合实施例对本发明作进一步描述:
实施例一: 频哪醇硼烷和苯甲酸3:1摩尔比生成硼酸酯
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入苯甲酸
(61.1 mg, 0.5 mmol),用移液枪加入频哪醇硼烷(218 μL, 1.5 mmol),在室温下反应12小时,将反应移出手套箱,中止反应,得到硼酸酯,以均三甲氧基苯(84.15 mg,0.5 mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为99%,反应示意图参见附图1。产物的核磁数据: 1H NMR (400 MHz, CDCl3) :δ 7.22– 7.32 (m, 5H, ArH),4.92
(s, 2H, CH2), 1.26 (s, 36H, CH3)。将硼酸酯进一步水解为醇,加入1g硅胶,以3mL甲醇为溶剂,50℃下反应3h,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为92%,反应示意图参见附图1。产物的核磁数据:1H NMR (400 MHz,
CDCl3) :δ 7.22– 7.29
(m, 5H, ArH), 4.61 (s, 2H, CH2), 1.87 (br s, 1H, OH)。
实施例二: 频哪醇硼烷和苯甲酸4:1摩尔比生成硼酸酯
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入苯甲酸
(60.3 mg, 0.5 mmol),用移液枪加入频哪醇硼烷(289 μL, 2 mmol),在室温下反应6小时,将反应移出手套箱,以均三甲氧基苯(83.05 mg,0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为93%。继续水解得到纯的伯醇,分离产率为85%。
实施例三: 频哪醇硼烷和苯甲酸4:1摩尔比生成硼酸酯
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入苯甲酸
(59.9 mg, 0.5 mmol),用移液枪加入频哪醇硼烷(289 μL, 2 mmol),在室温下反应12小时,将反应移出手套箱,以均三甲氧基苯(82.50 mg,0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为99%;继续水解得到纯的伯醇,分离产率为92%。
实施例四: 频哪醇硼烷和苯甲酸5:1摩尔比生成硼酸酯
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入苯甲酸
(60.8 mg, 0.5 mmol),用移液枪加入频哪醇硼烷(362 μL, 2.5 mmol),在室温下反应9小时,将反应移出手套箱,以均三甲氧基苯(83.74 mg,0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为99%;继续水解得到纯的伯醇,分离产率为92%。反应体系加入0.5mL无水1,4-二氧六环,产物收率18%。
实施例五: 频哪醇硼烷和4-氟苯甲酸4:1摩尔比生成硼酸酯
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入4-氟苯甲酸 (70.8 mg,0.5 mmol),用移液枪加入频哪醇硼烷(290 μL, 2
mmol),在室温下反应12小时,将反应移出手套箱,以均三甲氧基苯(84.99
mg,0.5 mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为90%。产物的核磁数据: 1H NMR (400
MHz, CDCl3):δ 7.22 (br s, 2H, ArCH), 6.92 (t, 2H,
ArCH),4.76 (s, 2H, OCH2),1.16 (s, 36H, CH3)。将硼酸酯进一步水解为醇,加入1g硅胶,以3mL甲醇为溶剂,50℃下反应3h,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为90%。产物的核磁数据:1H NMR (400 MHz, CDCl3) :δ 7.24
(br s, 2H, ArCH), 6.98 (t, 2H, ArCH),4.56
(s, 2H, CH2), 2.27 (br s, 1H, OH)。
实施例六: 频哪醇硼烷和4-溴苯甲酸4:1摩尔比生成硼酸酯
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入4-溴苯甲酸 (100 mg,0.5 mmol),用移液枪加入频哪醇硼烷(289 μL,2 mmol),在室温下反应12小时,将反应移出手套箱,以均三甲氧基苯 (83.67 mg,0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为95%。产物的核磁数据: 1H NMR (400 MHz, CDCl3):δ 7.41
(br s, 2H, ArCH), 7.18 (t, 2H, ArCH), 4.82 (s, 2H, OCH2), 1.21 (s, 36H, CH3)。将硼酸酯进一步水解为醇,加入1g硅胶,以3mL甲醇为溶剂,50℃下反应3h,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为93%。产物的核磁数据:1H NMR (400 MHz, CDCl3) :δ 7.41
(br s, 2H, ArCH), 7.19 (t, 2H, ArCH), 4.60 (s, 2H, CH2), 2.26 (br s, 1H, OH)。
实施例七: 频哪醇硼烷和2-甲氧基苯甲酸4:1摩尔比生成硼酸酯
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入2-甲氧基苯甲酸 (76.2 mg,0.5 mmol),用移液枪加入频哪醇硼烷(290 μL,2 mmol),在室温下反应12小时,将反应移出手套箱,以均三甲氧基苯 (84.23 mg,0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为99%。产物的核磁数据: 1H NMR (400 MHz, CDCl3):δ 7.42
(d, 1H, ArCH), 7.23 (t, 1H, ArCH), 6.96 (t, 1H, ArCH), 6.84 (d, 1H, ArCH), 4.98
(s,2H,OCH2), 1.27 (s,36H,CH3)。将硼酸酯进一步水解为醇,加入1g硅胶,以3mL甲醇为溶剂,50℃下反应3h,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为90%。产物的核磁数据:1H NMR (400 MHz, CDCl3) :δ 7.42
(d, 1H, ArCH), 7.23 (t, 1H, ArCH), 6.96 (t, 1H, ArCH), 6.84 (d, 1H, ArCH), 4.69
(s, 2H, CH2), 3.87 (br s, 1H, OH), 1.23 (s,3H,CH3)。
实施例八: 频哪醇硼烷和1-萘甲酸4:1摩尔比生成硼酸酯
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入1-萘甲酸 (85.4 mg,0.5 mmol,用移液枪加入频哪醇硼烷(289 μL, 2
mmol),在室温下反应12小时,将反应移出手套箱,以均三甲氧基苯
(83.42 mg,0.5 mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为91%。产物的核磁数据: 1H NMR (400
MHz, CDCl3):δ 8.02 (d, 1H, ArCH), 7.80-7.82 (m, 2H,
ArCH), 7.75(d, 1H, ArCH), 7.38-7.48 (m, 3H, ArCH), 5.37 (s, 2H, OCH2 ), 1.23
(s, 36H, CH3)。将硼酸酯进一步水解为醇,加入1g硅胶,以3mL甲醇为溶剂,50℃下反应3h,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为91%。产物的核磁数据:1H NMR (400 MHz, CDCl3):
δ 8.02 (d, 1H, ArCH), 7.80-7.82 (m, 2H,
ArCH), 7.73(d, 1H, ArCH), 7.38-7.48 (m, 3H, ArCH), 5.01 (s, 2H, CH2), 2.31 (br
s, 1H, OH)。
实施例九: 频哪醇硼烷和4-叔丁基苯甲酸4:1摩尔比生成硼酸酯
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入4-叔丁基苯甲酸 (88.9 mg,0.5 mmol,用移液枪加入频哪醇硼烷(290 μL, 2
mmol),在室温下反应12小时,将反应移出手套箱,以均三甲氧基苯
(83.89 mg,0.5 mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为99%。产物的核磁数据: 1H NMR (400
MHz, CDCl3):δ 7.28 ( d, 2H, ArCH), 7.19 (d, 2H, ArCH)
, 4.82 (s, 2H, OCH2 ), 1.23 (s, 9H, CH3, tBu), 1.18 (s, 36H, CH3)。将硼酸酯进一步水解为醇,加入1g硅胶,以3mL甲醇为溶剂,50℃下反应3h,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为92%。产物的核磁数据:1H NMR (400 MHz, CDCl3) :δ
7.28 ( d, 2H, ArCH), 7.19 (d, 2H, ArCH) , 4.51 (s, 2H, CH2), 2.12 (br s, 1H,
OH), 1.23 (s, 9H, CH3, tBu)。
实施例十: 频哪醇硼烷和2-溴苯甲酸4:1摩尔比生成硼酸酯
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入2-溴苯甲酸 (100.6 mg,0.5
mmol,用移液枪加入频哪醇硼烷(290 μL, 2 mmol),在室温下反应12小时,将反应移出手套箱,以均三甲氧基苯 (84.17 mg,0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为99%。产物的核磁数据: 1H NMR (400 MHz, CDCl3): δ 7.41 (d, 2H, ArCH), 7.19-7.22 (m, 1H, ArCH), 7.03 (t,
1H, ArCH), 4.90 (s, 2H, OCH2), 1.19 (s, 36H, CH3)。将硼酸酯进一步水解为醇,加入1g硅胶,以3mL甲醇为溶剂,50℃下反应3h,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为91%。产物的核磁数据:1H NMR (400 MHz, CDCl3):
δ 7.41 (d, 2H, ArCH), 7.19-7.22 (m, 1H,
ArCH), 7.03 (t, 1H, ArCH),4.71 (s, 2H, CH2), 2.41 (br s, 1H, OH)。
实施例十一: 频哪醇硼烷和4-碘苯甲酸4:1摩尔比生成硼酸酯
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入4-碘苯甲酸 (124.0 mg,0.5
mmol,用移液枪加入频哪醇硼烷(290 μL, 2 mmol),在室温下反应12小时,将反应移出手套箱,以均三甲氧基苯 (84.09 mg,0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为99%。产物的核磁数据: 1H NMR (400 MHz, CDCl3):δ 7.57
(d, 2H, ArCH), 7.02 (d, 2H, ArCH), 4.78 (s, 2H, OCH2), 1.18 (s, 36H, CH3)。将硼酸酯进一步水解为醇,加入1g硅胶,以3mL甲醇为溶剂,50℃下反应3h,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为94%。产物的核磁数据:1H NMR (400 MHz, CDCl3): δ 7.57 (d, 2H, ArCH), 7.02 (d, 2H, ArCH), 4.65 (s,
2H, CH2), 2.15 (br s, 1H, OH)。
实施例十二: 频哪醇硼烷和3-苯丙酸4:1摩尔比生成硼酸酯
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入3-苯丙酸 (74.9 mg,0.2 mmol,用移液枪加入频哪醇硼烷(289 μL, 2
mmol),在室温下反应10小时,将反应移出手套箱,以均三甲氧基苯
(83.89 mg,0.5 mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为99%。产物的核磁数据: 1H NMR (400
MHz, CDCl3):δ 7.18 (t, 2H, ,ArCH), 7.05- 7.10 (m, 3H,
ArCH), 3.80 (t, 2H, CH2, OCH2), 2.62 (t, 2H, CH2), 1.76-1.83 (m, 2H, CH2), 1.17
(s, 36H, CH3)。将硼酸酯进一步水解为醇,加入1g硅胶,以3mL甲醇为溶剂,50℃下反应3h,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为93%。产物的核磁数据:1H NMR (400 MHz, CDCl3) :δ 7.23
(t, 2H, ,ArCH), 7.11- 7.13 (m, 3H, ArCH), 3.60 (t, 2H, CH2, OCH2), 2.65 (t, 2H,
CH2), 1.78-1.85 (m, 2H, CH2), 1.61 (br s, 1H, OH)。
实施例十三: 频哪醇硼烷和二苯基乙酸4:1摩尔比生成硼酸酯
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入二苯基乙酸
(105.8 mg,0.5 mmol,用移液枪加入频哪醇硼烷(289 μL, 2 mmol),在室温下反应12小时,将反应移出手套箱,以均三甲氧基苯 (83.84 mg,0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为99%。产物的核磁数据: 1H NMR (400 MHz, CDCl3): δ 7.14-7.33 (m, 10H, ArCH), 4.42 (d, 2H, CH2, OCH2), 4.25
(t, 1H, CH), 1.24 (s,24H, CH3, pinBOBpin), 1.13 (s, 12H, CH3, OBpin)。将硼酸酯进一步水解为醇,加入1g硅胶,以3mL甲醇为溶剂,50℃下反应3h,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为92%。产物的核磁数据:1H NMR (400 MHz, CDCl3) :δ
7.20-7.31 (m, 10H, ArCH),4.19 (t, 1H, CH), 4.13 (d, 2H, CH2), 1.64-1.70 (t, 1H,
OH)。
实施例十四: 频哪醇硼烷和2-甲基-5-溴-苯甲酸4:1摩尔比生成硼酸酯
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入2-甲基-5-溴-苯甲酸 (107.1 mg,0.5
mmol,用移液枪加入频哪醇硼烷(289 μL, 2 mmol),在室温下反应12小时,将反应移出手套箱,以均三甲氧基苯 (83.77 mg,0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为99%。产物的核磁数据: 1H NMR (400 MHz, CDCl3): δ 6.91 (d, 1H, ArCH), 7.20 (d, 1H, ArCH), 7.48 (s, 1H,
ArCH), 4.78 (s, 2H, OCH2), 2.13 (s, 3H, CH3), 1.18 (s, 36H, CH3)。将硼酸酯进一步水解为醇,加入1g硅胶,以3mL甲醇为溶剂,50℃下反应3h,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为92%。产物的核磁数据:1H NMR (400 MHz, CDCl3) :δ 6.91
(d, 1H, ArCH), 7.22 (d, 1H, ArCH), 7.57 (s, 1H, ArCH), 4.44 (s, 2H, OCH2), 2.13
(s, 3H, CH3),2.25 (br s, 1H, OH)。
实施例十五: 频哪醇硼烷和2-苯基丁酸4:1摩尔比生成硼酸酯
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入2-苯基丁酸 (82.2 mg,0.5 mmol,用移液枪加入频哪醇硼烷(290 μL, 2
mmol),在室温下反应12小时,将反应移出手套箱,以均三甲氧基苯
(84.20 mg,0.5 mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为99%。产物的核磁数据: 1H NMR (400
MHz, CDCl3): δ 7.16-7.20 (m,
2H, ArCH), 7.09-7.11 (m, 3H, ArCH), 3.84-3.94 (m, 2H, CH2, OCH2), 2.58-2.67 (m,
1H, CH), 1.71-1.80 (m, 1H, CH2), 1.47-1.56 (m, 1H, CH2), 1.17 (s, 36H, CH3,
OBpin & pinBOBpin), 0.75 (t, 3H, CH3)。将硼酸酯进一步水解为醇,加入1g硅胶,以3mL甲醇为溶剂,50℃下反应3h,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为92%。产物的核磁数据:1H NMR (400 MHz, CDCl3) : δ 7.17-7.30 (m, 5H, ArCH), 3.66-3.68 (m, 2H, CH2,OCH2),
2.64 (m, 1H, CH), 1.54-1.73 (m, 1H, CH2), 1.87(s,1H, OH), 0.81 (t, 3H, CH3)。
实施例十六: 频哪醇硼烷和吲哚-3-乙酸5:1摩尔比生成硼酸酯
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入3-吲哚乙酸 (88.0 mg,0.5 mmol,用移液枪加入频哪醇硼烷(363 μL,
2.5 mmol),在室温下反应12小时,将反应移出手套箱,以均三甲氧基苯
(84.49 mg,0.5 mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为95%。产物的核磁数据: 1H NMR (400
MHz, CDCl3):δ 7.83 (d, 1H, ArCH), 7.46 (d, 1H, ArCH),
7.03-7.15 (m, 3H, ArCH), 4.07 (t, 2H, OCH2), 2.91 (t, 2H, CH2), 1.30 (s, 12H,
CH3, N-Bpin ) 1.15 (s, 24H, CH3, pinBOBpin), 1.07 (s, 12H, CH3, OBpin)。将硼酸酯进一步水解为醇,加入1g硅胶,以3mL甲醇为溶剂,50℃下反应3h,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为92%。产物的核磁数据:1H NMR (400 MHz, CDCl3) :δ
8.10 (s,1H,NH), 7.83 (d, 1H, ArCH), 7.46 (d, 1H, ArCH), 7.03-7.15 (m, 3H,
ArCH), 4.67 (t, 2H, OCH2), 3.28 (t, 2H, CH2), 1.90 (br s, 1H, OH)。
实施例十七: 频哪醇硼烷和邻羧基苯乙酸7:1摩尔比生成硼酸酯
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入邻羧基苯乙酸
(90.0 mg,0.5 mmol,用移液枪加入频哪醇硼烷(508μL, 3.5 mmol),在室温下反应11小时,将反应移出手套箱,以均三甲氧基苯 (84.02 mg,0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为99%。产物的核磁数据: 1H NMR (400 MHz, CDCl3):δ 7.34
(br s, 1H, ArCH), 7.12 (br s, 3H, ArCH), 4.91 (s, 2H, CH2), 3.97 (t, 2H, CH2),
2.87 (t, 2H, CH2), 1.18 (s, 72H, CH3, OBpin & pinBOBpin)。将硼酸酯进一步水解为醇,向取样剩余物中加入1g硅胶,以3mL甲醇为溶剂,50℃下反应3h,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为92%。产物的核磁数据:1H NMR (400 MHz, CDCl3) :δ 7.34
(br s, 1H, ArCH), 7.12 (br s, 3H, ArCH), 4.54 (s, 2 H, CH2), 3.76 (t, 2 H,
CH2OH), 3.7 (br, 1 H, OH), 3.1 (br s, 1 H, OH), 2.86 (t, 2 H, CH2)。
实施例十八: 频哪醇硼烷和乙酸4:1摩尔比
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入乙酸(28.6
μL, 0.5mmol),用移液枪加入频哪醇硼烷(290 μL, 2 mmol),在室温下反应10小时,将反应移出手套箱,中止反应,得到硼酸酯,取样,配核磁,以均三甲氧基苯 (84.08 mg,0.5 mmol)为内标,用CDCl3溶解,搅拌10分钟,经计算1H产率为99%;将乙酸替换为等摩尔乙醛,无法得到产物。产物的核磁数据: 1H
NMR (400 MHz, CDCl3): δ 3.89
(q, 2H, CH2), 1.26 (s, 36H, CH3), 1.22 (br s, 3H, CH3)。向取样剩余物中加入1g硅胶,以2.5mL甲醇为溶剂,50℃下反应3h,将硼酸酯进一步水解为醇,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为92%,反应示意图参见附图2,R来自乙酸。产物的核磁数据: 1H NMR (400 MHz, CDCl3):δ 3.69 (q, 2H, CH2), 2.92 (br s, 1H,OH), 1.22 (br s, 3H,
CH3)。
实施例十九: 频哪醇硼烷和戊酸4:1摩尔比
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入戊酸(54.38
μL, 0.5mmol),用移液枪加入频哪醇硼烷(290 μL, 2 mmol),在室温下反应10小时,将反应移出手套箱,以均三甲氧基苯 (84.12 mg,0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为92%。产物的核磁数据: 1H NMR (400 MHz, CDCl3): δ 3.82 (t, 2H, OCH2), 1.53-1.57 (m, 2H,CH2), 1.31-1.53 (m,
4H, CH2), 1.29(s, 36H, CH),0.87 (t, 3H, CH3)。向取样剩余物中加入1g硅胶,以2.5mL甲醇为溶剂,50℃下反应3h,将硼酸酯进一步水解为醇,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为87%。产物的核磁数据: 1H NMR (400 MHz, CDCl3):δ 3.63
(t, 2H, OCH2), 1.57 (m, 2H,CH2), 1.35 (m,2H, CH2), 2.35(br s, 1H, OH),0.91
(t, 3H, CH3)。
实施例二十: 频哪醇硼烷和己酸4:1摩尔比
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入己酸(62.52
μL, 0.5mmol),用移液枪加入频哪醇硼烷(290 μL, 2 mmol),在室温下反应10小时,将反应移出手套箱,以均三甲氧基苯 (84.01 mg,0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为90%。产物的核磁数据: 1H NMR (400 MHz, CDCl3): δ 3.77 (t, 2H, OCH2), 1.47-1.53 (m, 2H,CH2), 1.25-1.36 (m,
6H, CH2), 1.20(s, 48H, CH3),0.83 (t, 3H, CH3)。向取样剩余物中加入1g硅胶,以2.5mL甲醇为溶剂,50℃下反应3h,将硼酸酯进一步水解为醇,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为83%。产物的核磁数据: 1H NMR (400 MHz, CDCl3): δ 3.75 (t, 2H, OCH2), 1.47-1.53 (m, 2H,CH2), 1.25-1.36 (m,
6H, CH2), 1.72(br s, 1H, OH),0.83 (t, 3H, CH3)。
实施例二十一: 频哪醇硼烷和庚酸4:1摩尔比
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入庚酸(70.90
μL, 0.5mmol),用移液枪加入频哪醇硼烷(290 μL, 2 mmol),在室温下反应10小时,将反应移出手套箱,以均三甲氧基苯 (84.05 mg,0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为90%。产物的核磁数据: 1H NMR (400 MHz, CDCl3): δ 3.72 (t, 2H, OCH2), 1.42-1.48 (m, 2H,CH2), 1.20-1.31 (m,
8H, CH2), 1.15(s, 48H, CH3),0.78 (t, 3H, CH3)。向取样剩余物中加入1g硅胶,以2.5mL甲醇为溶剂,50℃下反应3h,将硼酸酯进一步水解为醇,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为82%。产物的核磁数据: 1H NMR (400 MHz, CDCl3): δ 3.72 (t, 2H, OCH2), 1.42-1.48 (m, 2H,CH2), 1.20-1.31 (m,
8H, CH2), 1.75(br s, 1H, OH),0.78 (t, 3H, CH3)。
实施例二十二: 频哪醇硼烷和三甲基乙酸4:1摩尔比
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入三甲基乙酸(50.7
mg, 0.5mmol),用移液枪加入频哪醇硼烷(289 μL, 2 mmol),在室温下反应10小时,将反应移出手套箱,以均三甲氧基苯 (84.08 mg,0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为99%。产物的核磁数据: 1H NMR (400 MHz, CDCl3): δ 3.44(s, 2H, OCH2), 1.18 (s, 36H, CH3, OBpin &
pinBOBpin), 0.83 (s, 9H, CH3)。向取样剩余物中加入1g硅胶,以2.5mL甲醇为溶剂,50℃下反应3h,将硼酸酯进一步水解为醇,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为90%。产物的核磁数据: 1H NMR (400 MHz, CDCl3): δ 3.20(s, 2H, OCH2), 1.97 (br s, 1H, OH), 0.83 (s, 9H,
CH3)。
实施例二十三: 频哪醇硼烷和己二酸7:1摩尔比
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入己二酸(72.9
mg, 0.5mmol),用移液枪加入频哪醇硼烷(508 μL, 3.5 mmol),在室温下反应10小时,将反应移出手套箱,以均三甲氧基苯 (83.90 mg,0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为99%。产物的核磁数据: 1H NMR (400 MHz, CDCl3):δ 3.78
(t, 4H, OCH2), 1.49-1.51 (m, 4H, CH2), 1.29-1.31 (m, 4H, CH2), 1.18 (s, 72H,
CH3, OBpin & pinBOBpin)。向取样剩余物中加入1g硅胶,以2.5mL甲醇为溶剂,50℃下反应3h,将硼酸酯进一步水解为醇,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为91%。产物的核磁数据: 1H NMR (400 MHz, CDCl3): δ 3.75 (t, 4H, OCH2), 1.48-1.51 (m, 4H, CH2), 1.29-1.31
(m, 4H, CH2), 2.26 (br s,2H, OH)。
实施例二十四: 频哪醇硼烷和乙酸3:1摩尔比
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入乙酸(28.6
μL, 0.5mmol),用移液枪加入频哪醇硼烷(218 μL, 1.5 mmol),在室温下反应10小时,将反应移出手套箱,以均三甲氧基苯 (84.08 mg,0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为95%。产物的核磁数据: 1H NMR (400 MHz, CDCl3): δ 3.89 (q, 2H, CH2), 1.26 (s, 36H, CH3), 1.22 (br s, 3H,
CH3)。向取样剩余物中加入1g硅胶,以2.5mL甲醇为溶剂,50℃下反应3h,将硼酸酯进一步水解为醇,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为90%。产物的核磁数据: 1H NMR (400 MHz, CDCl3): δ 3.69 (q, 2H, CH2), 2.92 (br s, 1H,OH), 1.22 (br s, 3H,
CH3)。
实施例二十五: 频哪醇硼烷和乙酸5:1摩尔比
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入乙酸(28.6
μL, 0.5mmol),用移液枪加入频哪醇硼烷(363 μL, 2.5 mmol),在室温下反应10小时,将反应移出手套箱,以均三甲氧基苯 (84.08 mg,0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为99%;反应体系加入无水0.5mL1,4-二氧六环,产物收率15%。产物的核磁数据: 1H NMR (400 MHz, CDCl3): δ 3.89 (q, 2H, CH2), 1.26 (s, 36H, CH3), 1.22 (br s, 3H,
CH3)。向取样剩余物中加入1g硅胶,以2.5mL甲醇为溶剂,50℃下反应3h,将硼酸酯进一步水解为醇,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为92%。产物的核磁数据: 1H NMR (400 MHz, CDCl3): δ 3.69 (q, 2H, CH2), 2.92 (br s, 1H,OH), 1.22 (br s, 3H,
CH3)。
实施例二十六
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入苯甲酸
(3.66g, 30mmol),用移液枪加入频哪醇硼烷(14.37mL, 99mmol),在室温下反应12小时,将反应移出手套箱,以均三甲氧基苯(0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为99%。产物的核磁数据: 1H NMR (400 MHz, CDCl3) :δ 7.22– 7.32 (m, 5H, ArH),4.92
(s, 2H, CH2), 1.26 (s, 36H, CH3)。将硼酸酯进一步水解为醇,向取样剩余物中加入60g硅胶,以180mL甲醇为溶剂,50℃下反应3h,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为91%。产物的核磁数据:1H NMR (400 MHz, CDCl3) :δ 7.22– 7.29 (m, 5H, ArH), 4.61 (s, 2H, CH2), 1.87 (br s, 1H,
OH)。
实施例二十七
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入苯甲酸
(6.11g, 50mmol),用移液枪加入频哪醇硼烷(23.94mL, 165mmol),在室温下反应12小时,将反应移出手套箱,以均三甲氧基苯(0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,取样,配核磁。经计算1H产率为99%。产物的核磁数据: 1H NMR (400 MHz, CDCl3) :δ 7.22– 7.32 (m, 5H, ArH),4.92
(s, 2H, CH2), 1.26 (s, 36H, CH3)。将硼酸酯进一步水解为醇,分离产率为91%。
实施例二十八
在惰性气体N2氛围下,向经过脱水脱氧处理后的反应瓶中加入乙酸(2.86
mL, 50mmol),用移液枪加入频哪醇硼烷(29mL, 0.2 mol),在室温下反应10小时,将反应移出手套箱,中止反应,得到硼酸酯,取样,配核磁,以均三甲氧基苯(0.5
mmol)为内标,用CDCl3溶解,搅拌10分钟,经计算1H产率为99%,产物的核磁数据: 1H NMR (400 MHz, CDCl3): δ 3.89 (q, 2H, CH2), 1.26 (s, 36H, CH3), 1.22 (br s, 3H,
CH3)。向取样剩余物中加入100g硅胶,以250mL甲醇为溶剂,50℃下反应3h,将硼酸酯进一步水解为醇,反应结束后,用乙酸乙酯萃取三次,合并有机层,用无水硫酸钠干燥,减压除去溶剂,通过硅胶(100-200目)柱色谱法纯化,用乙酸乙酯/己烷(1:5)混合物作为洗脱剂,得到纯的伯醇,分离产率为92%。产物的核磁数据: 1H NMR (400 MHz, CDCl3):δ 3.69
(q, 2H, CH2), 2.92 (br s, 1H,OH), 1.22 (br s, 3H, CH3)。
本发明实施例的反应在手套箱中进行;羧酸一般都是固体,脂肪族羧酸一般为液体,羧酸与频哪醇硼烷的反应为非均相反应,脂肪族羧酸与频哪醇硼烷的反应为均相反应。本发明是在无溶剂无催化剂下羧酸的硼氢化反应,符合绿色化学的原则。
Claims (10)
- 一种由羧酸无催化硼氢化反应制备硼酸酯的方法,其特征在于,包括以下步骤,无溶剂、无催化剂下,羧酸与硼烷进行无催化硼氢化反应制备硼酸酯。
- 根据权利要求1所述由羧酸无催化硼氢化反应制备硼酸酯的方法,其特征在于,所述硼烷为频哪醇硼烷;所述羧酸为乙酸、己酸、戊酸、庚酸、三甲基乙酸、己二酸、苯甲酸、4-溴苯甲酸、4-氟苯甲酸、1-萘甲酸、2-甲氧基苯甲酸、4-叔丁基苯甲酸、4-乙氧基苯甲酸、2-溴苯甲酸、4-碘苯甲酸、3-苯丙酸、二苯基乙酸、2-苯基丁酸、吲哚-3-乙酸、邻羧基苯乙酸或者2-甲基-5-溴苯甲酸。
- 根据权利要求1所述由羧酸无催化硼氢化反应制备硼酸酯的方法,其特征在于,所述羧酸和硼烷的摩尔比为 1:3~1:7;所述硼氢化反应的温度为室温;所述硼氢化反应的时间为6~12小时。
- 根据权利要求1所述由羧酸无催化硼氢化反应制备硼酸酯的方法,其特征在于,所述硼氢化反应在惰性气体氛围下进行;所述硼氢化反应结束后接触空气中止反应,得到硼酸酯。
- 一种由羧酸制备醇化合物的方法,其特征在于,包括以下步骤,无溶剂、无催化剂下,羧酸与硼烷进行硼氢化反应;硼氢化反应结束后加入硅胶、甲醇,水解反应制备醇化合物。
- 根据权利要求5所述由羧酸制备醇化合物的方法,其特征在于,所述羧酸和硼烷的摩尔比为 1:3~1:7;所述硼烷为频哪醇硼烷;所述羧酸为乙酸、己酸、戊酸、庚酸、三甲基乙酸、己二酸、苯甲酸、4-溴苯甲酸、4-氟苯甲酸、1-萘甲酸、2-甲氧基苯甲酸、4-叔丁基苯甲酸、4-乙氧基苯甲酸、2-溴苯甲酸、4-碘苯甲酸、3-苯丙酸、二苯基乙酸、2-苯基丁酸、吲哚-3-乙酸、邻羧基苯乙酸或者2-甲基-5-溴苯甲酸。
- 根据权利要求5所述由羧酸制备醇化合物的方法,其特征在于,所述硼氢化反应的温度为室温;所述硼氢化反应的时间为6~12小时;水解反应的条件为50℃下反应3h。
- 根据权利要求5所述由羧酸制备醇化合物的方法,其特征在于,所述硼氢化反应在惰性气体氛围下进行;所述硼氢化反应结束后接触空气中止反应,然后加入硅胶、甲醇,水解反应制备醇化合物。
- 羧酸与硼烷作为原料在制备硼酸酯或者醇化合物中的应用,其特征在于,所述应用在无催化剂下进行;所述硼烷为频哪醇硼烷;所述羧酸为乙酸、己酸、戊酸、庚酸、三甲基乙酸、己二酸、苯甲酸、4-溴苯甲酸、4-氟苯甲酸、1-萘甲酸、2-甲氧基苯甲酸、4-叔丁基苯甲酸、4-乙氧基苯甲酸、2-溴苯甲酸、4-碘苯甲酸、3-苯丙酸、二苯基乙酸、2-苯基丁酸、吲哚-3-乙酸、邻羧基苯乙酸或者2-甲基-5-溴苯甲酸。
- 根据权利要求9所述的应用,其特征在于,所述羧酸和硼烷的摩尔比为 1:3~1:7。
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| XING, QIYI ET AL.: "Reduction of Carboxylic Acid", BASIC ORGANIC CHEMISTRY, 30 June 2005 (2005-06-30), pages 582 - 583, XP009521536, ISBN: 7-04-016637-2 * |
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