US20200181173A1 - Method for preparing phenylboronic acid neopentyl glycol ester - Google Patents
Method for preparing phenylboronic acid neopentyl glycol ester Download PDFInfo
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- US20200181173A1 US20200181173A1 US16/091,520 US201616091520A US2020181173A1 US 20200181173 A1 US20200181173 A1 US 20200181173A1 US 201616091520 A US201616091520 A US 201616091520A US 2020181173 A1 US2020181173 A1 US 2020181173A1
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- US
- United States
- Prior art keywords
- solvent
- neopentyl glycol
- phenylboronic acid
- catalyst
- nickel
- Prior art date
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- -1 phenylboronic acid neopentyl glycol ester Chemical class 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000003054 catalyst Substances 0.000 claims abstract description 30
- 125000000623 heterocyclic group Chemical group 0.000 claims abstract description 26
- HZVOZRGWRWCICA-UHFFFAOYSA-N methanediyl Chemical compound [CH2] HZVOZRGWRWCICA-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 26
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 claims abstract description 20
- MDNDJMCSXOXBFZ-UHFFFAOYSA-N 2-(5,5-dimethyl-1,3,2-dioxaborinan-2-yl)-5,5-dimethyl-1,3,2-dioxaborinane Chemical compound O1CC(C)(C)COB1B1OCC(C)(C)CO1 MDNDJMCSXOXBFZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 claims abstract description 11
- BDAWXSQJJCIFIK-UHFFFAOYSA-N potassium methoxide Chemical compound [K+].[O-]C BDAWXSQJJCIFIK-UHFFFAOYSA-N 0.000 claims abstract description 11
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 72
- 239000002904 solvent Substances 0.000 claims description 39
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 33
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 24
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical group C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 18
- RIOQSEWOXXDEQQ-UHFFFAOYSA-N triphenylphosphine Chemical compound C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-N 0.000 claims description 17
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 10
- 239000011261 inert gas Substances 0.000 claims description 10
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 8
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 7
- 238000004440 column chromatography Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical group C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 claims description 5
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims description 5
- 229910052794 bromium Inorganic materials 0.000 claims description 5
- 239000000460 chlorine Chemical group 0.000 claims description 5
- QSNSCYSYFYORTR-UHFFFAOYSA-N 4-chloroaniline Chemical compound NC1=CC=C(Cl)C=C1 QSNSCYSYFYORTR-UHFFFAOYSA-N 0.000 claims description 4
- GJNGXPDXRVXSEH-UHFFFAOYSA-N 4-chlorobenzonitrile Chemical compound ClC1=CC=C(C#N)C=C1 GJNGXPDXRVXSEH-UHFFFAOYSA-N 0.000 claims description 4
- UGVRJVHOJNYEHR-UHFFFAOYSA-N 4-chlorobenzophenone Chemical compound C1=CC(Cl)=CC=C1C(=O)C1=CC=CC=C1 UGVRJVHOJNYEHR-UHFFFAOYSA-N 0.000 claims description 4
- WXNZTHHGJRFXKQ-UHFFFAOYSA-N 4-chlorophenol Chemical group OC1=CC=C(Cl)C=C1 WXNZTHHGJRFXKQ-UHFFFAOYSA-N 0.000 claims description 4
- IJJNXZDGQAGCLJ-UHFFFAOYSA-L [Ni](Br)Br.P(O)(O)O.P(O)(O)O Chemical compound [Ni](Br)Br.P(O)(O)O.P(O)(O)O IJJNXZDGQAGCLJ-UHFFFAOYSA-L 0.000 claims description 4
- 125000001246 bromo group Chemical group Br* 0.000 claims description 4
- 229910052801 chlorine Chemical group 0.000 claims description 4
- UYLRKRLDQUXYKB-UHFFFAOYSA-N nickel;triphenylphosphane Chemical compound [Ni].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 UYLRKRLDQUXYKB-UHFFFAOYSA-N 0.000 claims description 4
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 claims description 4
- 239000007795 chemical reaction product Substances 0.000 claims description 3
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 claims description 3
- 239000003960 organic solvent Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical group [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 2
- 125000001309 chloro group Chemical group Cl* 0.000 claims description 2
- 238000006880 cross-coupling reaction Methods 0.000 abstract description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 17
- 239000003446 ligand Substances 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 26
- UHOVQNZJYSORNB-MZWXYZOWSA-N benzene-d6 Chemical compound [2H]C1=C([2H])C([2H])=C([2H])C([2H])=C1[2H] UHOVQNZJYSORNB-MZWXYZOWSA-N 0.000 description 20
- HEDRZPFGACZZDS-MICDWDOJSA-N Trichloro(2H)methane Chemical compound [2H]C(Cl)(Cl)Cl HEDRZPFGACZZDS-MICDWDOJSA-N 0.000 description 16
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 11
- 238000000921 elemental analysis Methods 0.000 description 10
- 238000003786 synthesis reaction Methods 0.000 description 10
- 238000005160 1H NMR spectroscopy Methods 0.000 description 9
- 238000005481 NMR spectroscopy Methods 0.000 description 9
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 8
- 239000003153 chemical reaction reagent Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 230000003197 catalytic effect Effects 0.000 description 7
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical class [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 5
- 229910052796 boron Chemical class 0.000 description 5
- 238000012512 characterization method Methods 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 229910021585 Nickel(II) bromide Inorganic materials 0.000 description 4
- IPLJNQFXJUCRNH-UHFFFAOYSA-L nickel(2+);dibromide Chemical compound [Ni+2].[Br-].[Br-] IPLJNQFXJUCRNH-UHFFFAOYSA-L 0.000 description 4
- 239000003208 petroleum Substances 0.000 description 4
- BDZBKCUKTQZUTL-UHFFFAOYSA-N triethyl phosphite Chemical compound CCOP(OCC)OCC BDZBKCUKTQZUTL-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000012046 mixed solvent Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910052763 palladium Inorganic materials 0.000 description 3
- 150000008301 phosphite esters Chemical class 0.000 description 3
- LVEYOSJUKRVCCF-UHFFFAOYSA-N 1,3-bis(diphenylphosphino)propane Chemical compound C=1C=CC=CC=1P(C=1C=CC=CC=1)CCCP(C=1C=CC=CC=1)C1=CC=CC=C1 LVEYOSJUKRVCCF-UHFFFAOYSA-N 0.000 description 2
- JGFZNNIVVJXRND-UHFFFAOYSA-N N,N-Diisopropylethylamine (DIPEA) Chemical compound CCN(C(C)C)C(C)C JGFZNNIVVJXRND-UHFFFAOYSA-N 0.000 description 2
- 0 [1*]O[PH](O[1*])(O[1*])[Ni](C)(C)C1N([2*])CCN1[2*] Chemical compound [1*]O[PH](O[1*])(O[1*])[Ni](C)(C)C1N([2*])CCN1[2*] 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- XJHCXCQVJFPJIK-UHFFFAOYSA-M caesium fluoride Chemical compound [F-].[Cs+] XJHCXCQVJFPJIK-UHFFFAOYSA-M 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- YWWDBCBWQNCYNR-UHFFFAOYSA-N trimethylphosphine Chemical compound CP(C)C YWWDBCBWQNCYNR-UHFFFAOYSA-N 0.000 description 2
- KZPYGQFFRCFCPP-UHFFFAOYSA-N 1,1'-bis(diphenylphosphino)ferrocene Chemical compound [Fe+2].C1=CC=C[C-]1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=C[C-]1P(C=1C=CC=CC=1)C1=CC=CC=C1 KZPYGQFFRCFCPP-UHFFFAOYSA-N 0.000 description 1
- LZPWAYBEOJRFAX-UHFFFAOYSA-N 4,4,5,5-tetramethyl-1,3,2$l^{2}-dioxaborolane Chemical class CC1(C)O[B]OC1(C)C LZPWAYBEOJRFAX-UHFFFAOYSA-N 0.000 description 1
- WGGKSLBDJSENNL-UHFFFAOYSA-N B.CC(C)(CO)CO Chemical compound B.CC(C)(CO)CO WGGKSLBDJSENNL-UHFFFAOYSA-N 0.000 description 1
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- PJJPVGLDYPSUKO-UHFFFAOYSA-L C=1C=CC=CC=1P(C=1C=CC=CC=1)C([Ni](Cl)Cl)CCP(C=1C=CC=CC=1)C1=CC=CC=C1 Chemical compound C=1C=CC=CC=1P(C=1C=CC=CC=1)C([Ni](Cl)Cl)CCP(C=1C=CC=CC=1)C1=CC=CC=C1 PJJPVGLDYPSUKO-UHFFFAOYSA-L 0.000 description 1
- 239000007818 Grignard reagent Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- UORVGPXVDQYIDP-UHFFFAOYSA-N borane Chemical class B UORVGPXVDQYIDP-UHFFFAOYSA-N 0.000 description 1
- 229910000085 borane Inorganic materials 0.000 description 1
- WYLJBAMDIBXENO-UHFFFAOYSA-N boron;2,2-dimethylpropane-1,3-diol Chemical class [B].OCC(C)(C)CO WYLJBAMDIBXENO-UHFFFAOYSA-N 0.000 description 1
- 125000005620 boronic acid group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000004795 grignard reagents Chemical class 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- SKOWZLGOFVSKLB-UHFFFAOYSA-N hypodiboric acid Chemical compound OB(O)B(O)O SKOWZLGOFVSKLB-UHFFFAOYSA-N 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 description 1
- KYHNNWWCXIOTKC-UHFFFAOYSA-L nickel(2+);trimethylphosphane;dichloride Chemical compound Cl[Ni]Cl.CP(C)C.CP(C)C KYHNNWWCXIOTKC-UHFFFAOYSA-L 0.000 description 1
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical class [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- KGFLFWRAHYKYEA-UHFFFAOYSA-N trimethyl(2,2,2-trifluoroethoxy)silane Chemical compound C[Si](C)(C)OCC(F)(F)F KGFLFWRAHYKYEA-UHFFFAOYSA-N 0.000 description 1
- SJHCUXCOGGKFAI-UHFFFAOYSA-N tripropan-2-yl phosphite Chemical compound CC(C)OP(OC(C)C)OC(C)C SJHCUXCOGGKFAI-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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 Table
- C07F5/02—Boron compounds
- C07F5/025—Boronic and borinic acid compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
- B01J23/755—Nickel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- B01J31/18—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms
- B01J31/1845—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms the ligands containing phosphorus
- B01J31/185—Phosphites ((RO)3P), their isomeric phosphonates (R(RO)2P=O) and RO-substitution derivatives thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- B01J31/22—Organic complexes
- B01J31/2265—Carbenes or carbynes, i.e.(image)
- B01J31/2269—Heterocyclic carbenes
- B01J31/2273—Heterocyclic carbenes with only nitrogen as heteroatomic ring members, e.g. 1,3-diarylimidazoline-2-ylidenes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/04—Mixing
-
- 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
- C07F15/00—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table
- C07F15/04—Nickel compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2231/00—Catalytic reactions performed with catalysts classified in B01J31/00
- B01J2231/40—Substitution reactions at carbon centres, e.g. C-C or C-X, i.e. carbon-hetero atom, cross-coupling, C-H activation or ring-opening reactions
- B01J2231/48—Ring-opening reactions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
- B01J2531/80—Complexes comprising metals of Group VIII as the central metal
- B01J2531/84—Metals of the iron group
- B01J2531/847—Nickel
Definitions
- the invention belongs to the technical field of organic synthesis, and in particular relates to a method for preparing phenylboronic acid neopentyl glycol ester.
- Aryl borate compounds are a class of synthetic intermediates that are very important in the field of organic synthesis, so how to easily and efficiently synthesize various types of aryl boronate compounds has received continuous attention (see: Boronic Acids; Hall, DG; Wiley-VCH: Weinheim, Germany, 2005).
- the traditional method for synthesizing aryl borate is to react a halogenated aromatic hydrocarbon with a trialkyl borate under the action of a metal organic reagent such as an organozinc reagent, Grignard reagent, but there are many limitations for this method requires sensitive metal organic reagents (see: Suzuki, A.; Brown, HC Organic Syntheses via Boranes; Aldrich Chemical Co.: Milwaukee, 2003; Vol. 3).
- Nickel based catalysts are very inexpensive compared to expensive palladium based catalysts and have significant cost advantages in industrial applications. Therefore, the development of nickel-based catalysts to achieve cross-coupling reaction of halogenated aromatic hydrocarbons with boron reagents to synthesize aryl boronic esters has received increasing attention.
- a catalytic system consisting of 1,3-bis(diphenylphosphino)propyldichlorochloride and 1,3-bis(diphenyl-phosphino) propane can be used to achieve cross-coupling of brominated aromatic hydrocarbons and neopentyl glycol boron;
- catalytic system consisting of 1,3-bis(diphenylphosphino)propyldichloronickel and 1,1′-bis(diphenylphosphino) ferrocene, with zinc powder as an additive can efficiently catalyze the cross-coupling reaction of iodo-or-bromine aromatic with neopentyl glycol borane, which has better substrate suitability and higher catalytic efficiency.
- Cross-coupling reaction of chlorinated aromatic hydrocarbons and boronic acid pinacol ester can be obtained by using cesium fluoride as a alkali, trimethyl (2,2,2-trifluoroethoxy)silane as an additive and bis(trimethylphosphine)nickel dichloride as a catalyst, but the reaction temperature of the method still requires a high temperature of 100° C., and requires the use of more toxic trimethyl phosphine and more expensive additives.
- aromatic boron acid Using diisopropylethylamine as a base, the cross-coupling reaction of brominated aromatic hydrocarbons and chlorinated aromatic hydrocarbons with tetrahydroxydiboron to prepare aromatic boron acid can be carried out by using a catalytic system composed of 1,3-bis(diphenylphosphino)propyldichlorochloride and triphenylphosphine.
- this method also has some drawbacks, mainly: (1) the use of more toxic triphenylphosphine; (2) the substrate involved is mostly brominated aromatics, lower active, but cheaper, readily available chlorinated aromatics involve relatively less; (3) still require higher reaction temperatures for most chlorinated aromatic substrates, and the like. Therefore, it is necessary to develop more catalytic systems to efficiently catalyze the cross-coupling reaction of halogenated aromatic hydrocarbons, especially chlorinated aromatic hydrocarbons with boron reagents.
- the technical scheme adopted by the present invention is: a method for preparing phenylboronic acid neopentyl glycol ester, comprising the steps of: sequentially adding catalyst, potassium methoxide, bis(neopentyl glycolato)-diboron, phenyl chloride and organic solvent in an inert gas atmosphere; reacting at 40° C.
- the phenyl chloride is p-chlorophenol, p-chloroaniline, p-chlorobenzophenone or p-cyanochlorobenzene;
- the catalyst is used in an amount of 5% by mole of the phenyl chloride; the chemical structure of the catalyst is as follows:
- R 1 is ethyl or isopropyl
- R 2 is 2,4,6-trimethylphenyl, 2,6-diisopropylphenyl or tert-butyl
- X is bromine or chlorine
- reaction was terminated with water, and the reaction product was extracted with ethyl acetate and carried out column chromatography purification to carry out quantitative analysis to obtain the product yield.
- the inert gas is argon.
- the chemical formula of the catalyst in the present invention is Ni[P(OR 1 ) 3 ][(R 2 NCH 2 CH 2 NR 2 )C]X 2 ; the preparation method thereof is specifically as follows.
- the method for preparing the above mixed nickel(II) complex comprises the steps of dissolving bis(phosphite) nickel dibromide and nitrogen heterocyclic carbene in a solvent in an inert gas, the reaction is carried out at room temperature for 2 to 4 hours; then the solvent is removed in vacuo, the residue is extracted with toluene after washed with n-hexane, and the clear solution was transferred and removed the solvent toluene to obtain nickel (II) complex, which is the above-mentioned mixed nickel (II) complex containing phosphite ester and nitrogen heterocyclic carbene.
- the method for preparing the above mixed nickel(II) complex comprises the steps of dissolving bis(triphenylphosphine)nickel dichloride and nitrogen heterocyclic carbene in a solvent in an inert gas, the reaction is carried out at room temperature for 2 to 4 hours; then the solvent is removed in vacuo, the residue is extracted with toluene after washed with n-hexane, and the clear solution was transferred and removed the solvent toluene to obtain nickel(II) complex containing triphenylphosphine and nitrogen heterocyclic carbene.
- nickel(II) complex which is the above-mentioned mixed nickel (II) complex containing phosphite ester and nitrogen heterocyclic carbene.
- the inert gas is argon; the molar ratio of bis(phosphite) nickel dibromide to nitrogen heterocyclic carbene is 1:1; the molar ratio of bis(triphenylphosphine)nickel dichloride and nitrogen heterocyclic carbene is 1:1; the molar ratio of the mixed nickel(II) complex containing triphenylphosphine and nitrogen heterocyclic carbene to the phosphite is 1:1; the solvent is tetrahydrofuran.
- the selection basis of the solvent is that nitrogen heterocyclic carbene can be dissolved, and the mixed nickel(II) complex containing the phosphite ester and the nitrogen heterocyclic carbene ligand can also be dissolved, and the mixed nickel(II) complex containing triphenylphosphine and nitrogen heterocyclic carbene can also be dissolved; and no active hydrogen.
- nitrogen heterocyclic carbene can be dissolved, and the mixed nickel(II) complex containing the phosphite ester and the nitrogen heterocyclic carbene ligand can also be dissolved, and the mixed nickel(II) complex containing triphenylphosphine and nitrogen heterocyclic carbene can also be dissolved; and no active hydrogen.
- tetrahydrofuran for example, tetrahydrofuran.
- the molar ratio of the catalyst, potassium methoxide, bis(neopentyl glycolato)-diboron and phenyl chloride is 0.05:1.5:1.5:1.
- the invention can be obtained phenylboronic acid neopentyl glycol ester in a higher yield under the shorter reaction time and mild reaction temperature, less catalyst dosage, which greatly optimizes the reaction conditions and improves the product yield.
- the catalyst disclosed in the present invention introduces a phosphite ligand for the first time, and the substituents in the phosphite or nitrogen heterocyclic carbene can be variously selected, thereby a novel high-efficiency catalyst can be sent out; and can efficiently catalyze the cross-coupling reaction of phenyl chloride with bis(neopentyl glycolato)-diboron to synthesize phenylboronic acid neopentyl glycol ester in the presence of potassium methoxide, its catalytic activity and substrate suitability are better than the prior art; the reaction is simple and easy to operate, the product is easy to extract, and the yield is high.
- These complexes have a well-defined structure and are relatively stable solid in air, which is advantageous for large-scale synthesis and application.
- the product was subjected to nuclear magnetic characterization. The results were as follows: The product was dissolved in C 6 D 6 (about 0.4 mL), sealed, and characterized on a Unity Inova-400 NMR apparatus at room temperature: 1 H NMR (400 MHz, C 6 D 6 ): ⁇ 7.28 (s, 6H), 4.94 (s, 3H), 3.83 (s, 4H), 3.57 (s, 4H), 1.73 (s, 12H), 1.16 (s, 30H) ppm.
- the pink solid (0.2870 g, 0.5 mmol) was mixed with triethyl phosphite (86 ⁇ L, 0.5 mmol), and tetrahydrofuran was added as a solvent, and the mixture was reacted at room temperature for 1 hour, and the solvent was evaporated in vacuo. The residue was washed with n-hexane, and the residue obtained was extracted with toluene, and t the clear liquid is transferred, and solvent toluene is removed to give a yellow solid, wherein the yield is 90%.
- catalyst (17.3 mg, 0.025 mmol, 5 mol %), potassium methoxide (52.6 mg, 0.75 mmol), bis(neopentyl glycolato)-diboron (169.5 mg, 0.75 mmol), p-chlorophenol (49 ⁇ l, 0.50 mmol), 1.5 ml of 1,4-dioxane were sequentially added to the reaction flask, reacted at 40° C.
- catalyst (17.3 mg, 0.025 mmol, 5 mol %), potassium methoxide (52.6 mg, 0.75 mmol), bis(neopentyl glycolato)-diboron (169.5 mg, 0.75 mmol), p-chloroaniline (63.8 mg, 0.50 mmol), 1.5 ml of 1,4-dioxane were sequentially added to the reaction flask, reacted at 40° C.
- catalyst (17.3 mg, 0.025 mmol, 5 mol %), potassium methoxide (52.6 mg, 0.75 mmol), bis(neopentyl glycolato)-diboron (169.5 mg, 0.75 mmol), p-chlorobenzophenone (108 mg, 0.50 mmol), 1.5 ml of 1,4-dioxane were sequentially added to the reaction flask, reacted at 40° C. for 6 hours, quenched with water, and the product was extracted with ethyl acetate.
- the product was extracted with ethyl acetate and purified by column chromatography (mixed solvent of ethyl acetate/petroleum ether in a volume ratio of 1:20 as a developing solvent) in a yield of 58%.
- catalyst (6.9 mg, 0.01 mmol, 2 mol %), potassium methoxide (52.6 mg, 0.75 mmol), bis(neopentyl glycolato)-diboron (169.5 mg, 0.75 mmol), p-cyanochlorobenzene (69 mg, 0.50 mmol), 1.5 ml of 1,4-dioxane were sequentially added to the reaction flask, reacted at 40° C.
- reaction product was extracted with ethyl acetate and purified by column chromatography(mixing solvent of ethyl acetate/petroleum ether in a volume ratio of 1:20 as a developing solvent) in a yield of 41%.
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Abstract
Description
- The invention belongs to the technical field of organic synthesis, and in particular relates to a method for preparing phenylboronic acid neopentyl glycol ester.
- Aryl borate compounds are a class of synthetic intermediates that are very important in the field of organic synthesis, so how to easily and efficiently synthesize various types of aryl boronate compounds has received continuous attention (see: Boronic Acids; Hall, DG; Wiley-VCH: Weinheim, Germany, 2005). The traditional method for synthesizing aryl borate is to react a halogenated aromatic hydrocarbon with a trialkyl borate under the action of a metal organic reagent such as an organozinc reagent, Grignard reagent, but there are many limitations for this method requires sensitive metal organic reagents (see: Suzuki, A.; Brown, HC Organic Syntheses via Boranes; Aldrich Chemical Co.: Milwaukee, 2003; Vol. 3). In order to avoid the use of the above-mentioned metal organic reagents, a cross-coupling reaction of a transition metal-catalyzed halogenated aromatic hydrocarbon and a boron reagent has been developed to synthesize an aryl boronic acid ester, and a palladium-based catalyst is used in a large amount (see: Ishiyama, T Murata, M.; Miyaura, N.; J. Org. Chem. 1995, 60, 7508); however, the use of palladium-based catalysts also has some disadvantages, most notably its expensive price.
- Nickel based catalysts are very inexpensive compared to expensive palladium based catalysts and have significant cost advantages in industrial applications. Therefore, the development of nickel-based catalysts to achieve cross-coupling reaction of halogenated aromatic hydrocarbons with boron reagents to synthesize aryl boronic esters has received increasing attention. For example, a catalytic system consisting of 1,3-bis(diphenylphosphino)propyldichlorochloride and 1,3-bis(diphenyl-phosphino) propane can be used to achieve cross-coupling of brominated aromatic hydrocarbons and neopentyl glycol boron; catalytic system consisting of 1,3-bis(diphenylphosphino)propyldichloronickel and 1,1′-bis(diphenylphosphino) ferrocene, with zinc powder as an additive can efficiently catalyze the cross-coupling reaction of iodo-or-bromine aromatic with neopentyl glycol borane, which has better substrate suitability and higher catalytic efficiency. These results indicate that the relatively inexpensive nickel-based catalysts have great application prospects in the cross-coupling reaction of halogenated hydrocarbons with boron reagents for the synthesis of aryl boronate compounds, but these methods also have certain drawbacks, such as high reaction temperature of 100° C., and a catalyst amount of 10 mol %, and in particular, there is a problem that it cannot be widely applied to chlorinated aromatic hydrocarbon having a low activity but a relatively inexpensive and wide variety.
- Cross-coupling reaction of chlorinated aromatic hydrocarbons and boronic acid pinacol ester can be obtained by using cesium fluoride as a alkali, trimethyl (2,2,2-trifluoroethoxy)silane as an additive and bis(trimethylphosphine)nickel dichloride as a catalyst, but the reaction temperature of the method still requires a high temperature of 100° C., and requires the use of more toxic trimethyl phosphine and more expensive additives. Using diisopropylethylamine as a base, the cross-coupling reaction of brominated aromatic hydrocarbons and chlorinated aromatic hydrocarbons with tetrahydroxydiboron to prepare aromatic boron acid can be carried out by using a catalytic system composed of 1,3-bis(diphenylphosphino)propyldichlorochloride and triphenylphosphine.
- Compared with the previous method, this method also has some drawbacks, mainly: (1) the use of more toxic triphenylphosphine; (2) the substrate involved is mostly brominated aromatics, lower active, but cheaper, readily available chlorinated aromatics involve relatively less; (3) still require higher reaction temperatures for most chlorinated aromatic substrates, and the like. Therefore, it is necessary to develop more catalytic systems to efficiently catalyze the cross-coupling reaction of halogenated aromatic hydrocarbons, especially chlorinated aromatic hydrocarbons with boron reagents. So far, there have been no reports of mixed nickel(II) complexes containing phosphites and nitrogen heterocyclic carbene, nor have they been used to catalyze the cross-coupling between chlorinated aromatic hydrocarbons and bis(neopentyl glycolato)-diboron.
- It is an object of the present invention to provide a highly efficient catalyzed cross coupling reaction between a phenyl chloride and a bis(neopentyl glycolato)-diboron to prepare a phenylboronic acid neopentyl glycol ester using a mixed nickel(II) complex containing a phosphite and a nitrogen heterocyclic carbene in the presence of potassium methoxide which has significantly better catalytic activity and substrate suitability than the prior art.
- In order to achieve the above object, the technical scheme adopted by the present invention is: a method for preparing phenylboronic acid neopentyl glycol ester, comprising the steps of: sequentially adding catalyst, potassium methoxide, bis(neopentyl glycolato)-diboron, phenyl chloride and organic solvent in an inert gas atmosphere; reacting at 40° C. for 6 hours to obtain phenylboronic acid neopentyl glycol ester; the phenyl chloride is p-chlorophenol, p-chloroaniline, p-chlorobenzophenone or p-cyanochlorobenzene; the catalyst is used in an amount of 5% by mole of the phenyl chloride; the chemical structure of the catalyst is as follows:
- Wherein R1 is ethyl or isopropyl; R2 is 2,4,6-trimethylphenyl, 2,6-diisopropylphenyl or tert-butyl; and X is bromine or chlorine.
- After completion of the reaction, the reaction was terminated with water, and the reaction product was extracted with ethyl acetate and carried out column chromatography purification to carry out quantitative analysis to obtain the product yield.
- In the above technical scheme, the inert gas is argon.
- The chemical formula of the catalyst in the present invention is Ni[P(OR1)3][(R2NCH2CH2NR2)C]X2; the preparation method thereof is specifically as follows.
- When X is bromine, the method for preparing the above mixed nickel(II) complex comprises the steps of dissolving bis(phosphite) nickel dibromide and nitrogen heterocyclic carbene in a solvent in an inert gas, the reaction is carried out at room temperature for 2 to 4 hours; then the solvent is removed in vacuo, the residue is extracted with toluene after washed with n-hexane, and the clear solution was transferred and removed the solvent toluene to obtain nickel (II) complex, which is the above-mentioned mixed nickel (II) complex containing phosphite ester and nitrogen heterocyclic carbene.
- When X is chlorine, the method for preparing the above mixed nickel(II) complex comprises the steps of dissolving bis(triphenylphosphine)nickel dichloride and nitrogen heterocyclic carbene in a solvent in an inert gas, the reaction is carried out at room temperature for 2 to 4 hours; then the solvent is removed in vacuo, the residue is extracted with toluene after washed with n-hexane, and the clear solution was transferred and removed the solvent toluene to obtain nickel(II) complex containing triphenylphosphine and nitrogen heterocyclic carbene. Then, the mixed nickel(II) complex and the phosphite are dissolved in a solvent and reacted at room temperature for 1 hour; then the solvent is removed in vacuo, and the residue is extracted with toluene after washed with n-hexane, and the clear solution was transferred and removed the solvent toluene gives nickel(II) complex, which is the above-mentioned mixed nickel (II) complex containing phosphite ester and nitrogen heterocyclic carbene.
- In the above technical scheme of catalyst preparation, the inert gas is argon; the molar ratio of bis(phosphite) nickel dibromide to nitrogen heterocyclic carbene is 1:1; the molar ratio of bis(triphenylphosphine)nickel dichloride and nitrogen heterocyclic carbene is 1:1; the molar ratio of the mixed nickel(II) complex containing triphenylphosphine and nitrogen heterocyclic carbene to the phosphite is 1:1; the solvent is tetrahydrofuran. The selection basis of the solvent is that nitrogen heterocyclic carbene can be dissolved, and the mixed nickel(II) complex containing the phosphite ester and the nitrogen heterocyclic carbene ligand can also be dissolved, and the mixed nickel(II) complex containing triphenylphosphine and nitrogen heterocyclic carbene can also be dissolved; and no active hydrogen. For example, tetrahydrofuran.
- In the above technical scheme, the molar ratio of the catalyst, potassium methoxide, bis(neopentyl glycolato)-diboron and phenyl chloride is 0.05:1.5:1.5:1. The invention can be obtained phenylboronic acid neopentyl glycol ester in a higher yield under the shorter reaction time and mild reaction temperature, less catalyst dosage, which greatly optimizes the reaction conditions and improves the product yield.
- The catalyst disclosed in the present invention introduces a phosphite ligand for the first time, and the substituents in the phosphite or nitrogen heterocyclic carbene can be variously selected, thereby a novel high-efficiency catalyst can be sent out; and can efficiently catalyze the cross-coupling reaction of phenyl chloride with bis(neopentyl glycolato)-diboron to synthesize phenylboronic acid neopentyl glycol ester in the presence of potassium methoxide, its catalytic activity and substrate suitability are better than the prior art; the reaction is simple and easy to operate, the product is easy to extract, and the yield is high. These complexes have a well-defined structure and are relatively stable solid in air, which is advantageous for large-scale synthesis and application.
- The present invention is further described below in conjunction with the embodiments:
- Add a nitrogen heterocyclic carbene (R2NCH2CH2NR2) C (0.2464 g, 0.8 mmol) to the solution of di(triethyl phosphite) nickel dibromide (0.4400 g, 0.8 mmol) in tetrahydrofuran, react at room temperature for 2 hours, the solvent was removed in vacuum, the residue was washed with n-hexane, and the obtained residue is extracted by toluene, and the clear liquid is transferred, and solvent toluene is removed, so as to obtain a red solid, wherein the yield is 68%.
- The results of elemental analysis of the product are shown in Table 1:
-
TABLE 1 Elemental analysis results C: (%) H: (%) N: (%) Theoretical value 46.86 6.12 4.05 Actual value 47.04 6.21 3.99 - The product was subjected to nuclear magnetic characterization and the results are as follows:
- The product was dissolved in C6D6 (ca. 0.4 mL), sealed, and characterized by Unity Inova-400 NMR apparatus at room temperature: 1H NMR (400 MHz, C6D6): δ 6.88 (s, 4H), 3.97 (s, 6H), 3.13 (s, 4H), 2.64 (s, 12H), 2.15 (s, 6H), 1.02 (s, 9H) ppm.
- Add a nitrogen heterocyclic carbene (R2NCH2CH2NR2) C (0.3627 g, 0.93 mmol) to a solution of bis(triethyl phosphite) nickel dibromide (0.5115 g, 0.93 mmol) in tetrahydrofuran, react at room temperature for 2 hours, the solvent was removed in vacuum, the residue was washed with n-hexane, and the obtained residue is extracted by toluene, and the clear liquid is transferred, and solvent toluene is removed, so as to obtain a red crystals, wherein the yield is 77%.
- The results of elemental analysis of the product are shown in Table 2:
-
TABLE 2 Elemental analysis C: (%) H: (%) N: (%) Theoretical value 51.06 7.01 3.61 Actual value 51.33 7.19 3.49 - The product was subjected to nuclear magnetic characterization and the results are as follows:
- The product was dissolved in C6D6 (ca. 0.4 mL), sealed, and characterized by Unity Inova-400 NMR apparatus at room temperature: 1H NMR (400 MHz, C6D6): δ 7.29 (s, 6H), 3.91 (d, 6H), 3.88-3.71 (m, 4H), 3.58 (s, 4H), 1.75 (d, 12H), 1.18 (d, 12H), 1.02 (s, 9H) ppm.
- Add a nitrogen heterocyclic carbene (R2NCH2CH2NR2) C (0.3627 g, 0.93 mmol) to a solution of di(triisopropyl phosphite) nickel dibromide (0.5905 g, 0.93 mmol) in tetrahydrofuran, and react at room temperature for 3 hours. The solvent was removed in vacuo, and the residue was washed with n-hexane, and the residue obtained was extracted with toluene, and the clear liquid was transferred and remove the solvent toluene to give red-black crystals in a yield of 70%.
- The results of elemental analysis of the product are shown in Table 3:
-
TABLE 3 Elemental analysis C: (%) H: (%) N: (%) Theoretical value 52.84 7.39 3.42 Actual value 53.11 7.51 3.28 - The product was subjected to nuclear magnetic characterization. The results were as follows: The product was dissolved in C6D6 (about 0.4 mL), sealed, and characterized on a Unity Inova-400 NMR apparatus at room temperature: 1H NMR (400 MHz, C6D6): δ 7.28 (s, 6H), 4.94 (s, 3H), 3.83 (s, 4H), 3.57 (s, 4H), 1.73 (s, 12H), 1.16 (s, 30H) ppm.
- Add a nitrogen heterocyclic carbene (R2NCH2CH2NR2) C (0.1438 g, 0.78 mmol) to a solution of di(triethyl phosphite) nickel dibromide (0.4290 g, 0.78 mmol) in tetrahydrofuran, react at room temperature for 1 hour, the solvent was removed in vacuum, the residue was washed with n-hexane, and the obtained residue is extracted by toluene, and the clear liquid is transferred, and solvent toluene is removed, so as to obtain a yellow solid, wherein the yield is 60%. The results of elemental analysis of the product are shown in Table 4:
-
TABLE 4 Elemental analysis C: (%) H: (%) N: (%) Theoretical value 35.95 6.74 4.93 Actual value 36.22 6.88 4.81 - The product was subjected to nuclear magnetic characterization and the results are as follows:
- The product was dissolved in C6D6 (ca. 0.4 mL), sealed, and characterized on a Unity Inova-400 NMR apparatus at room temperature: 1H NMR (400 MHz, C6D6): δ 4.29-4.07 (m, 5H), 2.73 (t, 4H), 2.26 (s, 6H), 2.00 (s, 9H), 1.10 (dt, 9H), 0.45 (s, 4H) ppm.
- Add a nitrogen heterocyclic carbene (R2NCH2CH2NR2)C (0.1438 g, 0.78 mmol) to a solution of bis(triphenylphosphine)nickelchloride (0.5101 g, 0.78 mmol) in tetrahydrofuran, react at room temperature for 1 hour, and remove solvent in vacuo. The residue was washed with n-hexane, and the residue obtained was extracted with toluene, and the clear liquid is transferred, and solvent toluene is removed to give a pink solid, wherein the yield is 65%. Further, the pink solid (0.2870 g, 0.5 mmol) was mixed with triethyl phosphite (86 μL, 0.5 mmol), and tetrahydrofuran was added as a solvent, and the mixture was reacted at room temperature for 1 hour, and the solvent was evaporated in vacuo. The residue was washed with n-hexane, and the residue obtained was extracted with toluene, and t the clear liquid is transferred, and solvent toluene is removed to give a yellow solid, wherein the yield is 90%.
- The results of elemental analysis of the product are shown in Table 5:
-
TABLE 5 Elemental analysis C: (%) H: (%) N: (%) Theoretical value 42.62 8.00 5.85 Actual value 42.95 8.11 5.73 - The product was subjected to nuclear magnetic characterization and the results are as follows:
- The product was dissolved in C6D6 (ca. 0.4 mL), sealed, and characterized on a Unity Inova-400 NMR apparatus at room temperature: 1H NMR (400 MHz, C6D6): δ 4.21 (dp, 6H), 2.91-2.59 (m, 4H), 2.31 (s, 6H), 2.04 (s, 12H), 1.20 (t, 3H), 1.00 (t, 6H) ppm.
- Under argon protection, catalyst (17.3 mg, 0.025 mmol, 5 mol %), potassium methoxide (52.6 mg, 0.75 mmol), bis(neopentyl glycolato)-diboron (169.5 mg, 0.75 mmol), p-chlorophenol (49 μl, 0.50 mmol), 1.5 ml of 1,4-dioxane were sequentially added to the reaction flask, reacted at 40° C. for 6 hours, and quenched with water, the product was extracted with ethyl acetate and purified by column chromatography (a mixed solvent of ethyl acetate/petroleum ether in a volume ratio of 1:5 was used as a developing solvent), and the yield was 54%.
- The product was dissolved in CDCl3 (ca. 0.4 mL), sealed, and characterized on a Unity Inova-400 NMR apparatus at room temperature: 1H NMR (400 MHz, CDCl3, TMS): δ 7.70 (d, 2H), 6.81 (d, 2H), 5.35 (s, 1H), 3.75 (s, 4H), 1.01 (s, 6H) ppm.
- Under argon protection, catalyst (17.3 mg, 0.025 mmol, 5 mol %), potassium methoxide (52.6 mg, 0.75 mmol), bis(neopentyl glycolato)-diboron (169.5 mg, 0.75 mmol), p-chloroaniline (63.8 mg, 0.50 mmol), 1.5 ml of 1,4-dioxane were sequentially added to the reaction flask, reacted at 40° C. for 6 hours, and quenched with water, and the product was extracted with ethyl acetate and purified by column chromatography (a mixed solvent of ethyl acetate/petroleum ether in a volume ratio of 1:5 was used as a developing solvent), and the yield was 66%.
- The product was dissolved in CDCl3 (ca. 0.4 mL), sealed, and characterized on a Unity Inova-400 NMR apparatus at room temperature: 1H NMR (400 MHz, CDCl3, TMS): δ 7.61 (d, 2H), 6.66 (d, 2H), 3.78 (s, 2H), 3.74 (s, 4H), 1.01 (s, 6H) ppm.
- Under argon protection, catalyst (17.3 mg, 0.025 mmol, 5 mol %), potassium methoxide (52.6 mg, 0.75 mmol), bis(neopentyl glycolato)-diboron (169.5 mg, 0.75 mmol), p-chlorobenzophenone (108 mg, 0.50 mmol), 1.5 ml of 1,4-dioxane were sequentially added to the reaction flask, reacted at 40° C. for 6 hours, quenched with water, and the product was extracted with ethyl acetate. The product was extracted with ethyl acetate and purified by column chromatography (mixed solvent of ethyl acetate/petroleum ether in a volume ratio of 1:20 as a developing solvent) in a yield of 58%.
- The product was dissolved in CDCl3 (ca. 0.4 mL), sealed, and characterized on a Unity Inova-400 NMR apparatus at room temperature: 1H NMR (400 MHz, CDCl3, TMS): δ 7.97 (d, 2H), 7.88-7.79 (m, 4H), 7.64 (t, 1H), 7.53 (t, 2H), 3.86 (s, 4H), 1.10 (s, 6H) ppm.
- Under argon protection, catalyst (6.9 mg, 0.01 mmol, 2 mol %), potassium methoxide (52.6 mg, 0.75 mmol), bis(neopentyl glycolato)-diboron (169.5 mg, 0.75 mmol), p-cyanochlorobenzene (69 mg, 0.50 mmol), 1.5 ml of 1,4-dioxane were sequentially added to the reaction flask, reacted at 40° C. for 6 hours, quenched with water, the reaction product was extracted with ethyl acetate and purified by column chromatography(mixing solvent of ethyl acetate/petroleum ether in a volume ratio of 1:20 as a developing solvent) in a yield of 41%.
- The product was dissolved in CDCl3 (ca. 0.4 mL), sealed, and characterized on a Unity Inova-400 NMR apparatus at room temperature: 1H NMR (400 MHz, CDCl3, TMS): δ 7.93 (d, 2H), 7.67 (d, 2H), 3.83 (s, 4H), 1.08 (s, 6H) ppm.
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