CN117486788A - 一种2-氯-3-溴-6-甲基吡啶的制备方法 - Google Patents
一种2-氯-3-溴-6-甲基吡啶的制备方法 Download PDFInfo
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- JVDQYSIJBRTRMS-UHFFFAOYSA-N 3-bromo-2-chloro-6-methylpyridine Chemical compound CC1=CC=C(Br)C(Cl)=N1 JVDQYSIJBRTRMS-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- GXZDYRYYNXYPMQ-UHFFFAOYSA-N 2-chloro-6-methylpyridine Chemical compound CC1=CC=CC(Cl)=N1 GXZDYRYYNXYPMQ-UHFFFAOYSA-N 0.000 claims abstract description 12
- UYVXZUTYZGILQG-UHFFFAOYSA-N methoxyboronic acid Chemical compound COB(O)O UYVXZUTYZGILQG-UHFFFAOYSA-N 0.000 claims abstract description 8
- FILKGCRCWDMBKA-UHFFFAOYSA-N 2,6-dichloropyridine Chemical compound ClC1=CC=CC(Cl)=N1 FILKGCRCWDMBKA-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000031709 bromination Effects 0.000 claims abstract description 3
- 238000005893 bromination reaction Methods 0.000 claims abstract description 3
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 24
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000003960 organic solvent Substances 0.000 claims description 8
- 239000003153 chemical reaction reagent Substances 0.000 claims description 7
- 150000007529 inorganic bases Chemical class 0.000 claims description 6
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 claims description 6
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical group [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 6
- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 claims description 6
- -1 2-chloro-6-methylpyridine triphenylborane Chemical compound 0.000 claims description 5
- MXSVLWZRHLXFKH-UHFFFAOYSA-N triphenylborane Chemical compound C1=CC=CC=C1B(C=1C=CC=CC=1)C1=CC=CC=C1 MXSVLWZRHLXFKH-UHFFFAOYSA-N 0.000 claims description 5
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical group C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 3
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052794 bromium Inorganic materials 0.000 claims description 3
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 3
- 229910000160 potassium phosphate Inorganic materials 0.000 claims description 3
- 235000011009 potassium phosphates Nutrition 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 5
- 238000003786 synthesis reaction Methods 0.000 abstract description 4
- 239000000543 intermediate Substances 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 description 11
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- BZLVMXJERCGZMT-UHFFFAOYSA-N Methyl tert-butyl ether Chemical compound COC(C)(C)C BZLVMXJERCGZMT-UHFFFAOYSA-N 0.000 description 5
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical group C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 5
- 239000000706 filtrate Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- HEDRZPFGACZZDS-MICDWDOJSA-N Trichloro(2H)methane Chemical compound [2H]C(Cl)(Cl)Cl HEDRZPFGACZZDS-MICDWDOJSA-N 0.000 description 4
- 239000012065 filter cake Substances 0.000 description 4
- 239000012074 organic phase Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000004128 high performance liquid chromatography Methods 0.000 description 3
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 3
- 235000019345 sodium thiosulphate Nutrition 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 description 2
- 239000007868 Raney catalyst Substances 0.000 description 2
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 2
- 229910000564 Raney nickel Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- JPOXNPPZZKNXOV-UHFFFAOYSA-N bromochloromethane Chemical compound ClCBr JPOXNPPZZKNXOV-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000001308 synthesis method Methods 0.000 description 2
- UIEVSGOVFXWCIK-UHFFFAOYSA-N 2-chloro-6-methyl-3-nitropyridine Chemical compound CC1=CC=C([N+]([O-])=O)C(Cl)=N1 UIEVSGOVFXWCIK-UHFFFAOYSA-N 0.000 description 1
- ACQXHCHKMFYDPM-UHFFFAOYSA-N 2-chloro-6-methylpyridine-3-carboxylic acid Chemical compound CC1=CC=C(C(O)=O)C(Cl)=N1 ACQXHCHKMFYDPM-UHFFFAOYSA-N 0.000 description 1
- 108010085220 Multiprotein Complexes Proteins 0.000 description 1
- 102000007474 Multiprotein Complexes Human genes 0.000 description 1
- 101100465401 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) SCL1 gene Proteins 0.000 description 1
- QEZFOHDPTRQZBD-UHFFFAOYSA-N [B].FN1C(C=C(C=C1C)C)C Chemical compound [B].FN1C(C=C(C=C1C)C)C QEZFOHDPTRQZBD-UHFFFAOYSA-N 0.000 description 1
- 239000003905 agrochemical Substances 0.000 description 1
- 125000001246 bromo group Chemical group Br* 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000006193 diazotization reaction Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 108700008776 hepatitis C virus NS-5 Proteins 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- 239000002304 perfume Substances 0.000 description 1
- 239000012450 pharmaceutical intermediate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 150000003222 pyridines Chemical class 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000009885 systemic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D213/61—Halogen atoms or nitro radicals
Abstract
本发明公开了一种2‑氯‑3‑溴‑6‑甲基吡啶的制备方法,属于医药中间体合成技术领域。该技术方案采用2,6‑二氯吡啶与甲基硼酸偶联得到2‑氯‑6‑甲基吡啶,随后溴代得到2‑氯‑3‑溴‑6‑甲基吡啶,主要解决现有合成路线安全性、原料昂贵,适用性不广等技术问题。
Description
技术领域
本发明涉及一种2-氯-3-溴-6-甲基吡啶的制备方法,属于医药中间体合成技术领域。
背景技术
2-氯-3-溴-6-甲基吡啶广泛应用于医药中间体、农药中间体等、香料、表面活性剂等多个领域。2-氯-3-溴-6-甲基吡啶作为母核,其含有的吡啶邻位的甲基和卤素,均可以与其他基团的反应,进而增加官能团,得到各式各样的吡啶类化合物,由于吡啶环有较好的内吸性,因此生物活性更高、毒性更低。其中专利US2011/70189,2011,A1报道2-氯-3-溴-6-甲基吡啶用于合成丙型肝炎病毒NS5b聚合酶抑制剂。专利EP4019521,2022,A1报道采用2-氯-3-溴-6-甲基吡啶合成的化合物可用于治疗与EED蛋白和/或PRC2蛋白复合物的作用机制有关的疾病。
目前报道关于2-氯-3-溴-6-甲基吡啶的合成方法主要为以下两种:
第一种方法,文献[Chemistry ofHeterocyclic Compounds,1996,vol.32,#10,p.1173-1177]报道,采用2-氯-3-硝基-6-甲基吡啶与水合肼、雷尼镍还原硝基,随后重氮化溴代得到2-氯-3-溴-6-甲基吡啶,总收率48%。其中为了避免吡啶环卤素置换,采用更加危险的水合肼,雷尼镍还原,还有重氮化,均为危险反应,安全性不大,不适合规模化生产。其反应方程式表示如下:
第二种方法,文献[Journal ofthe American Chemical Society,2022]采用2-氯-6-甲基烟酸与四(乙腈)铜(I)四氟硼酸盐、1-氟-2,4,6-三甲基吡啶四氟化硼和溴氯甲烷在乙腈中反应,收率67%。采用试剂价格高昂,没有经济性。反应方程式表示如下:
针对在上述合成方法的安全性差、原料昂贵等缺点,本发明提出了一种2-氯-3-溴-6-甲基吡啶的改进合成工艺,使原料价格降低,安全性提高,进而满足日益增长的市场需求。
发明内容
为了克服上述技术缺陷,本发明公开了一种2-氯-3-溴-6-甲基吡啶的制备方法。采用2,6-二氯吡啶与甲基硼酸偶联得到2-氯-6-甲基吡啶,随后溴代得到2-氯-3-溴-6-甲基吡啶,主要解决现有合成路线安全性、原料昂贵,适用性不广等技术问题。
本发明一种2-氯-3-溴-6-甲基吡啶的制备方法,技术方案采用反应方程式表示如下:
本发明所述一种2-氯-3-溴-6-甲基吡啶的制备方法,包括如下步骤:
第一步:将2,6-二氯吡啶、甲基硼酸、无机碱、四(三苯基磷)钯和有机溶剂混合偶联得到2-氯-6-甲基吡啶;
第二步:2-氯-6-甲基吡啶三苯基硼烷与有机溶剂混合,加入溴代试剂溴化,经后处理得到2-氯-3-溴-6-甲基吡啶。
进一步地,在上述技术方案中,第一步所述有机溶剂选1,4-二氧六环或乙腈。
进一步地,在上述技术方案中,第一步所述无机碱选自碳酸钾或磷酸钾。
进一步地,在上述技术方案中,第一步所述2,6-二氯吡啶、甲基硼酸、无机碱与四(三苯基磷)钯摩尔比为1.0-1.2:1:1.5-3.0:0.006-0.01。
进一步地,在上述技术方案中,第二步所述有机溶剂选自乙腈或二氯甲烷。
进一步地,在上述技术方案中,第二步所述溴代试剂选自NBS或溴素。
进一步地,在上述技术方案中,第二步所述2-氯-6-甲基吡啶、三苯基硼烷溴代试剂摩尔比例为1:0.1-0.3:1.1-1.2。
进一步地,在上述技术方案中,第二步所述后处理是在反应结束后,加入硫代硫酸钠水溶液淬灭,产物在MTBE和二氯甲烷中与浓硫酸成盐,纯度可提高至99.0%以上,2-氯-6-甲基吡啶硫酸盐用氢氧化钠解离,正庚烷萃取,减压浓缩蒸干溶剂得到油状物2-氯-6-甲基吡啶,放置多天后可变为固体,或者解离后150-170℃减压蒸馏得到2-氯-6-甲基吡啶(白色固体)GC高达99.8%以上。
本发明技术方案具有:原料易得,操作连续,安全性得到增强;反应步骤短,得到的产品纯度高;采用三苯基硼烷催化剂起到定位作用,可有效是溴代在甲基对位;利用硫酸与吡啶成盐可以是产物纯度得到很大提升,可无需蒸馏就可得到产品。
说明书附图
图1为实施例5中得到2-氯-3-溴-6-甲基吡啶HNMR谱图。
具体实施例
下面结合具体实施例对本发明进行详细说明。以下实施例将有助于本领域的技术人员进一步理解本发明,但不以任何形式限制本发明。应当指出的是,对本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。
实施例1
氮气鼓吹保护下,将2,6-二氯吡啶56.9g(1.15eq)、甲基硼酸20g(1eq)、磷酸钾212.8g(3.0eq)、四(三苯基磷)钯2.3g(0.006eq)、1,4-二氧六环800mL和240mL水混合,升温至104℃反应6小时,降温,减压浓缩除去二氧六环,50-60℃加入甲苯萃取,有机相加入无水硫酸镁和少量硅胶搅拌,过滤,滤液浓缩至干得到2-氯-6-甲基吡啶45g。直接用于下一步,HPLC外标含量86.9%,收率91.7%。1HNMR(400MHz,CDCl3):δ7.53(dd,1H),7.13(d,1H),7.07(d,1H),2.53(s,3H).
实施例2
氮气鼓吹保护下,将2,6-二氯吡啶56.9g(1.15eq)、甲基硼酸20g(1eq)、碳酸钾97g(2.1eq)、四(三苯基磷)钯2.3g(0.006eq)、乙腈600mL和200mL水混合,升温至85℃反应14小时,降温,减压浓缩除去乙腈,50-60℃加入甲苯萃取,有机相加入无水硫酸镁和少量硅胶搅拌,过滤,滤液浓缩至干得到2-氯-6-甲基吡啶45.3g。直接用于下一步,HPLC外标含量85.3%,收率90.6%。
实施例3
将2-氯-6-甲基吡啶40g(外标含量86.9%)、三苯基硼13.2g(0.2eq)与乙腈400mL混合,降温至15-20℃,分批加入NBS 53.4g(1.1eq),室温反应16小时,减压浓缩至不流液,加入含有硫代硫酸钠水溶液中,加入MTBE 300mL萃取,碳酸氢钠和饱和食盐水洗涤,有机相用无水硫酸镁干燥,滤液降温至-5~0℃,加入50mL二氯甲烷,缓慢滴加98%浓硫酸27.2g(1eq),0℃搅拌2小时,过滤,滤饼用MTBE淋洗,滤饼重新投入釜内,加入正庚烷100mL,用5%氢氧化钾水溶液调pH=11.5-12.5,静置分层,有机相减压浓缩蒸干得到2-氯-3-溴-6-甲基吡啶49.8g,收率88.6%,HPLC 99.4%。1HNMR(400MHz,CDCl3):δ7.77(d,1H),6.96(d,1H),2.48(s,3H)。
实施例4
将2-氯-6-甲基吡啶40g(外标含量85.3%)、三苯基硼16.2g(0.25eq)与二氯甲烷500mL混合,降温至0℃,滴加溴素47.1g(1.1eq),随后升温室温反应4小时,加入含有硫代硫酸钠水溶液中,碳酸氢钠和饱和食盐水洗涤,有机相用无水硫酸镁干燥,滤液减压浓缩至剩余2V,加入300mL MTBE,并降温至-5~0℃,加入50mL二氯甲烷,缓慢滴加98%浓硫酸26.7g(1eq),0℃搅拌2小时,过滤,滤饼用MTBE淋洗,滤饼重新投入釜内,加入正庚烷100mL,用5%氢氧化钾水溶液调节pH=11.5-12.5,静置分层,有机相减压浓缩蒸干得到2-氯-3-溴-6-甲基吡啶49.9g,收率90.4%,HPLC99.7%。
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明披露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。
Claims (7)
1.一种2-氯-3-溴-6-甲基吡啶的制备方法,其特征在于,其反应方程式表示如下:
包括如下步骤:
第一步:将2,6-二氯吡啶、甲基硼酸、无机碱、四(三苯基磷)钯和有机溶剂混合偶联得到2-氯-6-甲基吡啶;
第二步:2-氯-6-甲基吡啶三苯基硼烷与有机溶剂混合,加入溴代试剂溴化,经后处理得到2-氯-3-溴-6-甲基吡啶。
2.根据权利要求1所述2-氯-3-溴-6-甲基吡啶的制备方法,其特征在于:第一步中,所述有机溶剂选1,4-二氧六环或乙腈。
3.根据权利要求1所述2-氯-3-溴-6-甲基吡啶的制备方法,其特征在于:第一步中,所述无机碱选自碳酸钾或磷酸钾。
4.根据权利要求1所述2-氯-3-溴-6-甲基吡啶的制备方法,其特征在于:第一步中,所述2,6-二氯吡啶、甲基硼酸、无机碱与四(三苯基磷)钯摩尔比为1.0-1.2:1:1.5-3.0:0.006-0.01。
5.根据权利要求1所述2-氯-3-溴-6-甲基吡啶的制备方法,其特征在于:第二步中,所述有机溶剂选自乙腈或二氯甲烷。
6.根据权利要求1所述2-氯-3-溴-6-甲基吡啶的制备方法,其特征在于:第二步中,所述溴代试剂选自NBS或溴素。
7.根据权利要求1所述2-氯-3-溴-6-甲基吡啶的制备方法,其特征在于:第二步中,所述2-氯-6-甲基吡啶、三苯基硼烷溴代试剂摩尔比例为1:0.1-0.3:1.1-1.2。
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