CN114057588B - 一种8-氨基-2-萘酚的合成方法 - Google Patents
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- KVHHMYZBFBSVDI-UHFFFAOYSA-N 8-aminonaphthalen-2-ol Chemical compound C1=C(O)C=C2C(N)=CC=CC2=C1 KVHHMYZBFBSVDI-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000001308 synthesis method Methods 0.000 title claims abstract description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 34
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 20
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 19
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 15
- 238000006396 nitration reaction Methods 0.000 claims abstract description 11
- UKVIEHSSVKSQBA-UHFFFAOYSA-N methane;palladium Chemical compound C.[Pd] UKVIEHSSVKSQBA-UHFFFAOYSA-N 0.000 claims abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000009467 reduction Effects 0.000 claims abstract description 7
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 6
- 238000001953 recrystallisation Methods 0.000 claims abstract description 6
- KPTRDYONBVUWPD-UHFFFAOYSA-N naphthalen-2-ylboronic acid Chemical compound C1=CC=CC2=CC(B(O)O)=CC=C21 KPTRDYONBVUWPD-UHFFFAOYSA-N 0.000 claims abstract description 5
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 21
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 9
- 238000006722 reduction reaction Methods 0.000 claims description 9
- 239000002904 solvent Substances 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical group C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 239000007810 chemical reaction solvent Substances 0.000 claims description 3
- 238000009903 catalytic hydrogenation reaction Methods 0.000 claims description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 2
- 230000002194 synthesizing effect Effects 0.000 claims 6
- 238000006243 chemical reaction Methods 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 7
- 230000003647 oxidation Effects 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000000543 intermediate Substances 0.000 abstract description 3
- 125000005619 boric acid group Chemical group 0.000 abstract description 2
- 239000012847 fine chemical Substances 0.000 abstract description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 15
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 229960000583 acetic acid Drugs 0.000 description 8
- 239000007787 solid Substances 0.000 description 8
- 238000004128 high performance liquid chromatography Methods 0.000 description 6
- 238000005406 washing Methods 0.000 description 6
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 5
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 5
- 239000012043 crude product Substances 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- YFXRFSBKDODZQP-UHFFFAOYSA-N 7-methoxy-1-nitronaphthalene Chemical compound COc1ccc2cccc([N+]([O-])=O)c2c1 YFXRFSBKDODZQP-UHFFFAOYSA-N 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000012044 organic layer Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- -1 8-amino-2-naphthol sodium salt Chemical compound 0.000 description 3
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 238000003760 magnetic stirring Methods 0.000 description 3
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 3
- OLTPLWKHHZTLJB-UHFFFAOYSA-N 2-ethoxy-1-nitronaphthalene Chemical group C1=CC=CC2=C([N+]([O-])=O)C(OCC)=CC=C21 OLTPLWKHHZTLJB-UHFFFAOYSA-N 0.000 description 2
- XDNSKIDXVJNJFO-UHFFFAOYSA-N 2-methoxy-1-nitronaphthalene Chemical compound C1=CC=CC2=C([N+]([O-])=O)C(OC)=CC=C21 XDNSKIDXVJNJFO-UHFFFAOYSA-N 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 2
- YZHNXQGDCFWEPO-UHFFFAOYSA-N 8-nitronaphthalen-2-ol Chemical compound C1=CC=C([N+]([O-])=O)C2=CC(O)=CC=C21 YZHNXQGDCFWEPO-UHFFFAOYSA-N 0.000 description 2
- OKKJLVBELUTLKV-MZCSYVLQSA-N Deuterated methanol Chemical compound [2H]OC([2H])([2H])[2H] OKKJLVBELUTLKV-MZCSYVLQSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical class [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000004327 boric acid Substances 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- XMPZTFVPEKAKFH-UHFFFAOYSA-P ceric ammonium nitrate Chemical compound [NH4+].[NH4+].[Ce+4].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O XMPZTFVPEKAKFH-UHFFFAOYSA-P 0.000 description 2
- 238000004440 column chromatography Methods 0.000 description 2
- 230000008034 disappearance Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000012362 glacial acetic acid Substances 0.000 description 2
- 239000011630 iodine Substances 0.000 description 2
- 229910052740 iodine Inorganic materials 0.000 description 2
- 239000010413 mother solution Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 239000012265 solid product Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- BIQQPSAQWNMDEK-UHFFFAOYSA-N (3-hydroxy-2,2-dimethylpropoxy)boronic acid Chemical compound OCC(C)(C)COB(O)O BIQQPSAQWNMDEK-UHFFFAOYSA-N 0.000 description 1
- HAMAREWLZOIKNP-UHFFFAOYSA-N (8-aminonaphthalen-2-yl)boronic acid Chemical compound C1=C(B(O)O)C=C2C(N)=CC=CC2=C1 HAMAREWLZOIKNP-UHFFFAOYSA-N 0.000 description 1
- LUZDYPLAQQGJEA-UHFFFAOYSA-N 2-Methoxynaphthalene Chemical compound C1=CC=CC2=CC(OC)=CC=C21 LUZDYPLAQQGJEA-UHFFFAOYSA-N 0.000 description 1
- SXAMGRAIZSSWIH-UHFFFAOYSA-N 2-[3-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]-1,2,4-oxadiazol-5-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1=NOC(=N1)CC(=O)N1CC2=C(CC1)NN=N2 SXAMGRAIZSSWIH-UHFFFAOYSA-N 0.000 description 1
- NDGWQNJHOROWIO-UHFFFAOYSA-N 2-methoxy-6-nitronaphthalene Chemical compound C1=C([N+]([O-])=O)C=CC2=CC(OC)=CC=C21 NDGWQNJHOROWIO-UHFFFAOYSA-N 0.000 description 1
- HIUOEXSQVINKQF-UHFFFAOYSA-N 7-ethoxy-1-nitronaphthalene Chemical compound C1=CC=C([N+]([O-])=O)C2=CC(OCC)=CC=C21 HIUOEXSQVINKQF-UHFFFAOYSA-N 0.000 description 1
- QEZZCWMQXHXAFG-UHFFFAOYSA-N 8-aminonaphthalene-2-sulfonic acid Chemical compound C1=C(S(O)(=O)=O)C=C2C(N)=CC=CC2=C1 QEZZCWMQXHXAFG-UHFFFAOYSA-N 0.000 description 1
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- GWESVXSMPKAFAS-UHFFFAOYSA-N Isopropylcyclohexane Natural products CC(C)C1CCCCC1 GWESVXSMPKAFAS-UHFFFAOYSA-N 0.000 description 1
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical class [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000017858 demethylation Effects 0.000 description 1
- 238000010520 demethylation reaction Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000013332 literature search Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000002390 rotary evaporation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical class O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C213/00—Preparation of compounds containing amino and hydroxy, amino and etherified hydroxy or amino and esterified hydroxy groups bound to the same carbon skeleton
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- 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 System
- C07F5/02—Boron compounds
- C07F5/025—Boronic and borinic acid compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/55—Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups
Abstract
本发明涉及一种8‑氨基‑2‑萘酚的合成方法,属于精细化工中间体技术领域。以2‑萘硼酸为原料,采用醋酸和浓硝酸进行硝化,得到8‑硝基‑2‑萘硼酸,经过铁粉或钯碳还原后,接着双氧水氧化得到8‑氨基‑2‑萘酚。该合成方法解决了硝化反应时选择性问题,硼酸基团通过氧化顺利再次转变为羟基,工艺条件相对比较温和,仅需在最后反应步骤进行重结晶即可得到高纯产品。
Description
技术领域
本发明涉及一种8-氨基-2-萘酚的合成方法,属于精细化工中间体技术领域。
背景技术
8-氨基-2-萘酚,8-Amino-2-naphthol,CAS:118-46-7,浅灰色至类白色固体,用作中性染料灰、棕、黑、卡其等偶合组分的中间体。
目前文献主要合成方法为,采用1-氨基-7-萘磺酸为原料,与烧碱碱熔,升温至280~300℃反应生成8-氨基-2-萘酚钠盐,加入稀酸酸化,得到8-氨基-2-萘酚析出;该方法中需要超高反应温度,对车间设备要求较高。
申请人拟采用8-硝基-2-甲氧基萘通过脱甲基方法得到8-硝基-2-萘酚,然后8-硝基-2-萘酚通过还原得到8-氨基-2-萘酚,经过检索文献,针对8-硝基-2-甲氧基萘:文献中采用2-甲氧基萘在负载有硅胶的硝酸铈铵发生硝化反应,生成两种硝化产物,1-硝基-2-甲氧基萘和8-硝基-2-甲氧基萘,收率分别为45%和38%,两种产物通过柱层析分离。不采用硅胶负载时,则生成四种硝化产物,分别为2-甲氧基-8-硝基萘(30%)、2-甲氧基-6-硝基萘(46%)、2-甲氧基-1-硝基萘(30%)和2-甲氧基4,8-二硝基萘(15%)。对上述实验进行重复时(采用乙酸/发烟硝酸体系),发现主要产物为1-硝基-2-乙氧基萘,通过两次乙醇重结晶可以纯化得到1-硝基-2-乙氧基萘,收率69%,次要产物8-硝基-2-乙氧基萘进入母液中无法纯化。
因此,寻找更为合适的合成方法,提高硝化反应时主产物与副产物比例仍有较大改进空间。
发明内容
为了克服上述技术缺陷,本发明公开了一种8-氨基-2-萘酚的合成方法。经过多种硝化条件和试剂工艺优化,以2-萘硼酸为原料,发现采用该底物进行硝化时,主产物为8-硝基-2-萘硼酸,经过铁粉或钯碳还原后,接着双氧水氧化得到8-氨基-2-萘酚。该合成方法解决了硝化反应时选择性问题,硼酸基团通过氧化顺利再次转变为羟基,工艺条件相对比较温和,仅需在最后反应步骤进行重结晶即可得到高纯产品。
本发明所述一种8-氨基-2-萘酚的合成方法,采用反应方程式表示如下:
包括如下步骤:
第一步,硝化反应
2-萘硼酸与含有硝酸的混酸,控温-10℃至40℃反应,生成8-硝基-2-萘硼酸;
第二步,还原反应
8-硝基-2-萘硼酸采用铁粉在乙酸中反应;或在钯碳存在下,催化氢化反应,得到8-氨基-2-萘硼酸;
第三步,氧化反应
8-氨基-2-萘硼酸在乙酸溶剂中,与双氧水反应,重结晶后得到8-氨基-2-萘酚。
进一步地,在上述技术方案中,第一步硝酸为浓硝酸或发烟硝酸,混酸为乙酸和硝酸、浓硫酸和硝酸体系;其中浓硫酸和浓硝酸体系,异构体较多,最佳反应条件为乙酸和浓硝酸体系,采用不同硝化反应条件时,主要异构体为4-硝基-2-萘硼酸。
进一步地,在上述技术方案中,第二步采用铁粉还原时,溶剂为乙醇;采用钯碳还原时,反应溶剂为四氢呋喃或乙酸乙酯。采用甲醇或乙醇溶剂时,出现掉硼副产物,推测可能为硼酸与醇反应生成不稳定硼酸酯,加氢时发生脱硼现象。
进一步地,在上述技术方案中,第二步铁粉与8-硝基-2-萘硼酸摩尔比为2-4:1;钯碳选自5%或10%湿钯碳,加入量为8-硝基-2-萘硼酸重量的2-5%。
进一步地,在上述技术方案中,第三步双氧水浓度为20-30%;双氧水与8-氨基-2-萘硼酸摩尔比为1-2:1。
进一步地,在上述技术方案中,第三步采用异丙醇与环己烷重结晶进行纯化,产品纯度可达95-97%。
进一步地,在上述技术方案中,为了得到更高纯度产品,经过实验研究发现:还原反应时,8-氨基-2-萘硼酸粗品与新戊二醇生成8-氨基-2-萘硼酸新戊二醇酯,加入二氯甲烷溶解,加入甲苯溶剂析出8-氨基-2-萘硼酸新戊二醇酯。采用该方法可以去除异构体,得到纯度99.0%以上8-氨基-2-萘硼酸新戊二醇酯;接着双氧水氧化,正庚烷打浆即可得到高纯8-氨基-2-萘酚。
说明书附图
图1为实施例7中固体产品1HNMR谱图;
图2为实施例7中固体产品13CNMR谱图;
具体实施例
实施例1
在250mL三口瓶内,加入2-萘硼酸(17.2g,0.1mol)和80mL冰醋酸,控温-10℃至0℃滴加浓硝酸(0.11mol),滴加完毕,保温搅拌1.5小时。TLC检测原料消失,体系有明显主斑点。将反应液倒入冰水中,过滤得到粗品。粗品加入乙酸乙酯溶解,水洗两次,饱和食盐水洗,旋蒸干燥后得到土黄色固体18.7g,收率86%。HPLC纯度为97.3%,其中主产物与异构体两者比例为91/9。主产物柱层析纯化得到样品:1H NMR(400MHz,CD3OD):8.79(s,1H),8.42(m,1H),8.21-8.28(m,2H),7.74(s,1H),7.33(s,1H)。
实施例2
实施例1同样反应条件下,将80mL冰醋酸采用50mL浓硫酸替代,反应结束处理后,收率88%,产品主产物与异构体比例为85/15。
实施例3
实施例1同样反应条件下,将浓硝酸采用发烟硝酸替代,反应结束处理后,收率91%,产品主产物与异构体比例为77/23。
实施例4
在配有机械搅拌500mL三口瓶内,加入实施例1中方法得到的8-硝基-2-萘硼酸(21.7g,0.1mol)、还原铁粉(0.32mol)和220mL乙醇,搅拌均匀升温至50-55℃。控制温度50-65℃滴加醋酸溶液(0.25mol),滴加完毕升温至回流反应3小时,TLC检测原料消失,降温至50℃,硅藻土过滤,乙醇进行淋洗,滤液减压浓缩至干,加入120mL乙酸乙酯,0.5M稀盐酸洗,饱和食盐水洗,有机层减压浓缩,加入30mL甲醇完全溶清后,再加入180mL水溶液搅拌,过滤得到浅黄色固体16.6g,收率89%。
实施例5
磁力搅拌下,在500mL三口瓶内,加入实施例1中方法得到的8-硝基-2-萘硼酸(21.7g,0.1mol)、5%Pd/C和220mL无水乙醇,氢气置换三次后,冲入氢气至压力为0.3MPa,升温至40-45℃至不再吸氢为止。降温泄压,过滤掉催化剂,母液旋蒸至约45mL,搅拌下加入180mL水溶液搅拌,过滤得到浅黄色固体17.9g,收率96%。
实施例6
磁力搅拌下,在500mL三口反应瓶内,加入实施例5中得到的8-氨基-2-萘硼酸(18.7g,0.1mol)和110mL甲醇溶剂,接着加入催化量碘(1mmol),搅拌下体系完全溶清,升温至30℃开始滴加25%双氧水溶液(0.13mol),滴加过程中有明显放热,控制滴加过程中温度不超过40℃。滴加完毕,继续保温35-40℃搅拌1小时,TLC检测反应完毕。将至室温,加入乙酸乙酯150mL,饱和亚硫酸氢钠洗两次,饱和食盐水洗,有机层旋干,得到粗品14.6g,HPLC纯度90.2%。粗品加入异丙醇和环己烷(体积比1/5)重结晶,得到类白色固体8-氨基-2-萘酚12.2g,收率78%,HPLC纯度95.7%。
实施例7
将实施例5中得到的8-氨基-2-萘硼酸(11.2g,0.06mol)加入80mL乙酸乙酯和新戊二醇(0.066mol),室温搅拌1小时,TLC检测反应完毕。加入饱和碳酸氢钠洗,饱和食盐水洗,有机层旋蒸得到8-氨基-2-萘硼酸新戊二醇酯(HPLC分析产物/异构体比例为90.1/9.9%)。加入22mL二氯甲烷加热至30-35℃搅拌下溶解,再加入甲苯140mL,待甲苯溶剂慢慢渗透析出固体,降温至0℃,过滤得到类白色固体12.4g,HPLC纯度99.3%。
磁力搅拌下,在500mL三口反应瓶内,加入上述8-氨基-2-萘硼酸新戊二醇酯(20.7g,0.081mol)和110mL甲醇溶剂,接着加入催化量碘(0.81mmol),搅拌下体系完全溶清,升温至30℃开始滴加25%双氧水溶液(0.11mol),滴加过程中有明显放热,控制滴加过程中温度不超过40℃。滴加完毕,继续保温35-40℃搅拌1小时,TLC检测反应完毕。将至室温,加入乙酸乙酯150mL,饱和亚硫酸氢钠洗两次,饱和食盐水洗,有机层旋干,异丙醇/环己烷(体积比1/5)重结晶得到类白色固体11.8g,收率91%,HPLC纯度99.2%。1H NMR(400MHz,DMSO-d6):9.40(s,1H),7.57(m,1H),7.23(s,1H),6.94-7.02(m,3H),6.59(m,1H),5.28(s,2H);13C NMR(100MHz,DMSO-d6):154.3,143.5,129.7,129.1,124.9,123.6,118.3,116.3,108.2,104.7。
以上实施例描述了本发明的基本原理、主要特征及优点。本行业的技术人员应该了解,本发明不受上述实施例的限制,上述实施例和说明书中描述的只是说明本发明的原理,在不脱离本发明原理的范围下,本发明还会有各种变化和改进,这些变化和改进均落入本发明保护的范围内。
Claims (7)
1.一种8-氨基-2-萘酚的合成方法,其特征在于,包括如下操作:包括如下步骤:
第一步,硝化反应
2-萘硼酸与含有硝酸的混酸,控温-10℃至40℃反应,生成8-硝基-2-萘硼酸;
第二步,还原反应
8-硝基-2-萘硼酸采用铁粉在乙酸中反应;或在钯碳存在下,催化氢化反应,得到8-氨基-2-萘硼酸;
第三步,氧化反应
8-氨基-2-萘硼酸在乙酸溶剂中,与双氧水反应,重结晶后得到8-氨基-2-萘酚。
2.根据权利要求1所述8-氨基-2-萘酚的合成方法,其特征在于:第一步中,硝酸为浓硝酸或发烟硝酸,混酸为乙酸和硝酸、浓硫酸和硝酸体系。
3.根据权利要求1所述8-氨基-2-萘酚的合成方法,其特征在于:第二步中,采用铁粉还原时,反应溶剂为乙醇。
4.根据权利要求1所述8-氨基-2-萘酚的合成方法,其特征在于:第二步中,采用钯碳还原时,反应溶剂为四氢呋喃或乙酸乙酯。
5.根据权利要求1所述8-氨基-2-萘酚的合成方法,其特征在于:第二步中,铁粉与8-硝基-2-萘硼酸摩尔比为2-4:1;钯碳选自5%或10%湿钯碳,加入量为8-硝基-2-萘硼酸重量的2-5%。
6.根据权利要求1所述8-氨基-2-萘酚的合成方法,其特征在于:第三步中,双氧水浓度为20-30%;双氧水与8-氨基-2-萘硼酸摩尔比为1-2:1。
7.根据权利要求1所述8-氨基-2-萘酚的合成方法,其特征在于:第三步中,采用异丙醇与环己烷重结晶。
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