CN101284247B - Dinuclear nickel cross-coupling reaction catalyst supported by nitrogen heterocycle carbine ligand and preparation method thereof - Google Patents

Dinuclear nickel cross-coupling reaction catalyst supported by nitrogen heterocycle carbine ligand and preparation method thereof Download PDF

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CN101284247B
CN101284247B CN2008100616751A CN200810061675A CN101284247B CN 101284247 B CN101284247 B CN 101284247B CN 2008100616751 A CN2008100616751 A CN 2008100616751A CN 200810061675 A CN200810061675 A CN 200810061675A CN 101284247 B CN101284247 B CN 101284247B
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nitrogen heterocycle
coupling reaction
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CN101284247A (en
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陈万芝
袭振兴
周永波
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Zhejiang University ZJU
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Abstract

The invention discloses a dual-core nickel cross-coupling reaction catalyst supported by N-heterocyclic carbine and a preparation method. Acetonitrile is taken as a solvent, N-heterocyclic carbine ligand and silver oxide in the molar ratio of 1: 3 to 1: 6 are added and stirred, the reaction is carried out for 10 to 15 hours away from light; Ni(DME)Cl2 or Ni(PPh3)2Cl2, Ni(DME)Cl2 or Ni(PPH3)2Cl2 and the N-heterocyclic carbine ligand in the molar ratio of 2: 1 to 3: 1 are added and filtered, the filtrate is condensed, ether is added for precipitation of yellow solids, the yellow solids are sequentially washed by ethanol and ether for 2 to 3 times, the acetonitrile is then used for dissolution, the ether is slowly added, and the dual-core nickel cross-coupling reaction catalyst supported by the N-heterocyclic carbine is obtained by crystallization. The dual-core nickel catalyst synthesized by the invention can play the synergy due to the shorter distance between two nickel atoms, the catalytic effect thereof is higher than the common palladium catalyst, thus having very ideal catalytic effect on chlorinated aryl compounds with cheap price and wide application prospect in fine chemical and pharmaceutical industries and being environment-friendly.

Description

Dinuclear nickel cross-coupling reaction catalyst and preparation method that nitrogen heterocycle carbine ligand supports
Technical field
The present invention relates to dinuclear nickel cross-coupling reaction catalyst and preparation method that a kind of nitrogen heterocycle carbine ligand supports.
Background technology
Form the cross-coupling reaction such as the Suzuki of C-C key, Kumada etc. are reflected at industrial being with a wide range of applications, the catalyst of these cross-coupling reactions of catalysis the most widely of research is the Metal Palladium and the harmful phosphine part of environment of price comparison costliness at present, and this makes them be restricted aspect commercial Application.In recent years, as the replenishing and substituting of phosphine part, nitrogen heterocycle carbine ligand was widely used in (Jafarpour, L. in the various organic chemical reactionses; Nolan, S.P.J.Organomet.Chem, 2001,617-618,17-27), however, disclosed cross-coupling reaction catalyst with real value still uses Metal Palladium mostly, and all undesirable for the chloro aryl compound effect that is difficult to react.
Summary of the invention
The objective of the invention is to overcome the prior art deficiency, the dinuclear nickel cross-coupling reaction catalyst and the preparation method that provide a kind of nitrogen heterocycle carbine ligand to support.
The dinuclear nickel cross-coupling reaction catalyst that nitrogen heterocycle carbine ligand supports is that the N-heterocyclic carbine compound with the pyrazoles functionalization is a part, and with the hydroxyl bridging, its cationic molecule formula is between two nickle atoms:
Figure S2008100616751D00011
Its anion is PF 6 -, Cl -Perhaps BF 4 -
The molecular formula of described N-heterocyclic carbine compound is:
R represent methylidene pyridine wherein, pyridine, pyrimidine, methyldiphenyl base phosphorus, ethyl diphenylphosphine and derivative thereof.N-heterocyclic carbine (dotted line) is represented imidazoles, benzimidazole and derivative thereof.
Structural formula with the hydroxyl bridging between described two nickle atoms is:
Figure DEST_PATH_G200810061675101D00011
The preparation method of the dinuclear nickel cross-coupling reaction catalyst that nitrogen heterocycle carbine ligand supports is: be solvent with the acetonitrile, adding mol ratio is 1: 3-1: 6 nitrogen heterocycle carbine ligand and silver oxide, stir lucifuge reaction 10-15 hour; Add Ni (DME) Cl 2Perhaps Ni (PPh 3) 2Cl 2, Ni (DME) Cl 2Perhaps Ni (PPh 3) 2Cl 2With the nitrogen heterocycle carbine ligand mol ratio be 2: 1-3: 1, filter, filtrate concentrates, add ether and separate out yellow solid, yellow solid is washed 2-3 time with ethanol, ether successively, with the acetonitrile dissolving, slowly add ether again, crystallization obtains the dinuclear nickel cross-coupling reaction catalyst that nitrogen heterocycle carbine ligand supports.
The double-core Raney nickel that the present invention synthesizes is owing to distance between two nickle atoms can play synergy than weak point, its catalytic effect is higher than common palladium catalyst, has very desirable catalytic effect for low-cost chloro aryl compound, and environmental friendliness, in fine chemistry industry and pharmaceuticals industry, be with a wide range of applications.
The specific embodiment
To help to understand the present invention by following examples of implementation, but not limit content of the present invention.
Embodiment 1,
Figure DEST_PATH_G200810061675101D00012
At room temperature, add ligand L 1 702mg (1mmol), acetonitrile 20mL, silver oxide 696mg (3mmol) reacted 10 hours, added Ni (DME) Cl 2574mg (2mmol) filters, and filtrate concentrates, add ether and separate out yellow solid, yellow solid successively with ethanol, ether washing 2 times, is dissolved with acetonitrile again, slowly add ether, crystallization obtains the dinuclear nickel cross-coupling reaction catalyst 1 that the 424mg nitrogen heterocycle carbine ligand supports, productive rate 51%. 1H?NMR(400MHz,d 6-DMSO):δ9.03(d,J=5.6Hz,2H),8.11(t,J=7.6Hz,2H),7.71(d,J=5.6Hz,2H),7.62(d,J=2.0Hz,2H),7.59(t,J=6.4,7.6Hz,2H),7.55(d,J=2.0Hz,2H),6.36(s,1H),5.62(s,4H),5.37(s,4H),1.90(s,1H)ppm. 13C?NMR(400MHz,d 6-DMSO):δ153.5(Ni-C),152.0,149.7,145.4,140.7,125.4,125.3,123.1,123.1,102.4,52.4,46.6ppm.
Embodiment 2,
Figure S2008100616751D00031
At room temperature, add ligand L 1702mg (1mmol), acetonitrile 20mL, silver oxide 1.392g (6mmol) reacted 10 hours, added Ni (DME) Cl 2574mg (2mmol) filters, and filtrate concentrates, add ether and separate out yellow solid, yellow solid successively with ethanol, ether washing 2 times, is dissolved with acetonitrile again, slowly add ether, crystallization obtains the dinuclear nickel cross-coupling reaction catalyst 1 that the 424mg nitrogen heterocycle carbine ligand supports, productive rate 51%. 1H?NMR(400MHz,d 6-DMSO):δ9.03(d,J=5.6Hz,2H),8.11(t,J=7.6Hz,2H),7.71(d,J=5.6Hz,2H),7.62(d,J=2.0Hz,2H),7.59(t,J=6.4,7.6Hz,2H),7.55(d,J=2.0Hz,2H),6.36(s,1H),5.62(s,4H),5.37(s,4H),1.90(s,1H)ppm. 13C?NMR(400MHz,d 6-DMSO):δ153.5(Ni-C),152.0,149.7,145.4,140.7,125.4,125.3,123.1,123.1,102.4,52.4,46.6ppm.
Embodiment 3,
Figure S2008100616751D00032
At room temperature, add ligand L 1702mg (1mmol), acetonitrile 20mL, silver oxide 696g (3mmol) reacted 10 hours, added Ni (DME) Cl 2574mg (2mmol) filters, and filtrate concentrates, add ether and separate out yellow solid, yellow solid successively with ethanol, ether washing 3 times, is dissolved with acetonitrile again, slowly add ether, crystallization obtains the dinuclear nickel cross-coupling reaction catalyst 1 that the 424mg nitrogen heterocycle carbine ligand supports, productive rate 51%. 1H?NMR(400MHz,d 6-DMSO):δ9.03(d,J=5.6Hz,2H),8.11(t,J=7.6Hz,2H),7.71(d,J=5.6Hz,2H),7.62(d,J=2.0Hz,2H),7.59(t,J=6.4,7.6Hz,2H),7.55(d,J=2.0Hz,2H),6.36(s,1H),5.62(s,4H),5.37(s,4H),1.90(s,1H)ppm. 13C?NMR(400MHz,d 6-DMSO):δ153.5(Ni-C),152.0,149.7,145.4,140.7,125.4,125.3,123.1,123.1,102.4,52.4,46.6ppm.
Embodiment 4,
Figure S2008100616751D00041
At room temperature, add ligand L 1702mg (1mmol), acetonitrile 20mL, silver oxide 1.392g (6mmol) reacted 10 hours, added Ni (PPh 3) 2Cl 21.308g (2mmol), filter, filtrate concentrates, add ether and separate out yellow solid, yellow solid successively with ethanol, ether washing 2 times, is dissolved with acetonitrile again, slowly add ether, crystallization obtains the dinuclear nickel cross-coupling reaction catalyst 1 that the 441mg nitrogen heterocycle carbine ligand supports, productive rate 53%. 1H?NMR(400MHz,d 6-DMSO):δ9.03(d,J=5.6Hz,2H),8.11(t,J=7.6Hz,2H),7.71(d,J=5.6Hz,2H),7.62(d,J=2.0Hz,2H),7.59(t,J=6.4,7.6Hz,2H),7.55(d,J=2.0Hz,2H),6.36(s,1H),5.62(s,4H),5.37(s,4H),1.90(s,1H)ppm. 13CNMR(400MHz,d 6-DMSO):δ153.5(Ni-C),152.0,149.7,145.4,140.7,125.4,125.3,123.1,123.1,102.4,52.4,46.6ppm.
Embodiment 5,
Figure S2008100616751D00042
At room temperature, add ligand L 1702mg (1mmol), acetonitrile 20mL, silver oxide 696mg (3mmol) reacted 15 hours, added Ni (DME) Cl 2574mg (2mmol) filters, and filtrate concentrates, add ether and separate out yellow solid, yellow solid successively with ethanol, ether washing 2 times, is dissolved with acetonitrile again, slowly add ether, crystallization obtains the dinuclear nickel cross-coupling reaction catalyst 1 that the 424mg nitrogen heterocycle carbine ligand supports, productive rate 51%. 1H?NMR(400MHz,d 6-DMSO):δ9.03(d,J=5.6Hz,2H),8.11(t,J=7.6Hz,2H),7.71(d,J=5.6Hz,2H),7.62(d,J=2.0Hz,2H),7.59(t,J=6.4,7.6Hz,2H),7.55(d,J=2.0Hz,2H),6.36(s,1H),5.62(s,4H),5.37(s,4H),1.90(s,1H)ppm. 13C?NMR(400MHz,d 6-DMSO):δ153.5(Ni-C),152.0,149.7,145.4,140.7,125.4,125.3,123.1,123.1,102.4,52.4,46.6ppm.
Embodiment 6,
Figure S2008100616751D00051
At room temperature, add ligand L 1702mg (1mmol), acetonitrile 20mL, silver oxide 696mg (3mmol) reacted 15 hours, added Ni (DME) Cl 2861mg (3mmol) filters, and filtrate concentrates, add ether and separate out yellow solid, yellow solid successively with ethanol, ether washing 2 times, is dissolved with acetonitrile again, slowly add ether, crystallization obtains the dinuclear nickel cross-coupling reaction catalyst 1 that the 433mg nitrogen heterocycle carbine ligand supports, productive rate 52%. 1H?NMR(400MHz,d 6-DMSO):δ9.03(d,J=5.6Hz,2H),8.11(t,J=7.6Hz,2H),7.71(d,J=5.6Hz,2H),7.62(d,J=2.0Hz,2H),7.59(t,J=6.4,7.6Hz,2H),7.55(d,J=2.0Hz,2H),6.36(s,1H),5.62(s,4H),5.37(s,4H),1.90(s,1H)ppm. 13C?NMR(400MHz,d 6-DMSO):δ153.5(Ni-C),152.0,149.7,145.4,140.7,125.4,125.3,123.1,123.1,102.4,52.4,46.6ppm.
Embodiment 7,
Figure S2008100616751D00052
At room temperature, add ligand L 2674mg (1mmol), acetonitrile 20mL, silver oxide 696mg (3mmol) reacted 15 hours, added Ni (DME) Cl 2574mg (2mmol) filters, and filtrate concentrates, add ether and separate out yellow solid, yellow solid successively with ethanol, ether washing 2 times, is dissolved with acetonitrile again, slowly add ether, crystallization obtains the dinuclear nickel cross-coupling reaction catalyst 2 that the 371mg nitrogen heterocycle carbine ligand supports, productive rate 46%. 1H?NMR(400MHz,d 6-DMSO):δ8.35(s,2H),8.34(m,4H),7.98(d,J=8.0Hz,2H),7.69(s,2H),7.56(t,J=6.4Hz,2H),6.38(s,1H),5.45(s,4H),1.67(s,1H)ppm. 13C?NMR(400MHz,d 6-DMSO):δ157.9(Ni-C),150.2,150.1,144.9,144.0,124.2,123.3,118.5,111.8,103.3,47.8ppm.
Embodiment 8,
Figure S2008100616751D00053
At room temperature, add ligand L 2674mg (1mmol), acetonitrile 20mL, silver oxide 696mg (3mmol) reacted 15 hours, added Ni (PPh 3) 2Cl 21.306mg (2mmol), filter, filtrate concentrates, add ether and separate out yellow solid, yellow solid successively with ethanol, ether washing 2 times, with the acetonitrile dissolving, is slowly added ether again, crystallization obtains the dinuclear nickel cross-coupling reaction catalyst 2 that the 387mg nitrogen heterocycle carbine ligand supports, productive rate 46%. 1H?NMR(400MHz,d 6-DMSO):δ8.35(s,2H),8.34(m,4H),7.98(d,J=8.0Hz,2H),7.69(s,2H),7.56(t,J=6.4Hz,2H),6.38(s,1H),5.45(s,4H),1.67(s,1H)ppm. 13CNMR(400MHz,d 6-DMSO):δ157.9(Ni-C),150.2,150.1,144.9,144.0,124.2,123.3,118.5,111.8,103.3,47.8ppm.
Embodiment 9,
Figure S2008100616751D00061
2-imidazoles picoline 795mg (5mmol), 3,5-dichloromethyl pyrazoles 330mg (2mmol), in acetone solvent, refluxed 10 hours, and obtained yellow sticky solid, with twice of this solid of toluene wash, be dissolved in again in the 10mL water, the aqueous solution of above-mentioned imidazole salts is added drop-wise to 1g NH 4PF 6The aqueous solution in, filter, use ethanol, ether washed twice respectively, obtain yellow solid 805mg, productive rate 57%. 1H?NMR(400MHz,DMSO-d 6):13.45(s,1H,NH),9.34(s,2H,NCHN),8.54(d,J=4.8,2H,6-py),7.90(t,J=7.6,2H,4-py),7.80,7.75(s,each?2H,CHi mdazole),7.49(d,J=7.2,2H,3-py),7.41(t,J=4.8,7.2,2H,5-py),6.48(s,1H,CH pyrazole),5.58-5.40(m,8H,CH 2).? 13C{ 1H}NMR(100.6MHz,DMSO-d 6):153.8,153.7,149.9,147.2,137.9,137.8,137.6,137.3,128.2,124.1,124.0,123.9,123.8,123.7,122.9,122.7,105.5,53.4,48.8.
Embodiment 10,
Figure S2008100616751D00062
2-Imidazopyridine 725mg (5mmol), 3,5-dichloromethyl pyrazoles 330mg (2mmol), in acetone solvent, refluxed 10 hours, and obtained white sticky solid, with twice of this solid of toluene wash, be dissolved in again in the 10mL water, the aqueous solution of above-mentioned imidazole salts is added drop-wise to 1g NH 4PF 6The aqueous solution in, filter, use ethanol, ether washed twice respectively, obtain white solid 608mg, productive rate 47%.
Embodiment 11,
Figure S2008100616751D00071
Under nitrogen protection, in reaction tube, add 0.8mg (0.1%mmol) double-core Raney nickel 1, chlorobenzene 101 μ L (1mmol), the grignard reagent 1.2mmol of methyl bromobenzene, room temperature reaction 10 hours adds dilute hydrochloric acid solution 10mL, uses ethyl acetate extraction, uses MgSO 4Drying concentrates again, crosses silicagel column and separates (leacheate benzinum), obtains product 4-methyl biphenyl, productive rate: 129mg (77%). 1H?NMR(400MHz,CDCl 3,TMS):δ7.57(d,J=8.0Hz,2H),7.49(d,J=8.0Hz,2H),7.43(t,J=7.6Hz,2H),7.32(t,J=7.6Hz,1H),7.24(t,J=7.6Hz,2H),2.38(s,3H)ppm.MS(EI,m/z):168[M +].
Embodiment 12,
Figure S2008100616751D00072
Under nitrogen protection, in reaction tube, add 4mg (0.5%mmol) double-core Raney nickel 1, chlorobenzene 101 μ L (1mmol), the grignard reagent 1.2mmol of methyl bromobenzene, room temperature reaction 10 hours adds dilute hydrochloric acid solution 10mL, uses ethyl acetate extraction, uses MgSO 4Drying concentrates again, crosses silicagel column and separates (leacheate benzinum), obtains product 4-methyl biphenyl, productive rate: 168mg (100%). 1H?NMR(400MHz,CDCl 3,TMS):δ7.57(d,J=8.0Hz,2H),7.49(d,J=8.0Hz,2H),7.43(t,J=7.6Hz,2H),7.32(t,J=7.6Hz,1H),7.24(t,J=7.6Hz,2H),2.38(s,3H)ppm.MS(EI,m/z):168[M +].
Embodiment 13,
Figure S2008100616751D00073
Under nitrogen protection, in reaction tube, add 4mg (0.5%mmol) double-core Raney nickel 1,2-chloropyridine 120 μ L (1mmol); the grignard reagent 1.2mmol of methyl bromobenzene, room temperature reaction 10 hours adds dilute hydrochloric acid solution 10mL; use ethyl acetate extraction, use MgSO 4Drying concentrates again, crosses silicagel column and separates (leacheate benzinum), obtains product 2-tolyl pyridine, productive rate: 169mg (100%). 1H?NMR(400MHz,CDCl 3,TMS):δ8.66(d,J=4.4Hz,1H),7.89(d,J=8.0Hz,2H),7.70(m,2H),7.28(d,J=8.0Hz,2H),7.17(m,1H),2.39(s,3H)ppm.MS(EI,m/z):169[M +].
Embodiment 14,
Figure S2008100616751D00081
Under nitrogen protection, in reaction tube, add 4mg (0.5%mmol) double-core Raney nickel 1,2-chlorine pyrimidine 114mg (1mmol), the grignard reagent 1.2mmol of methyl bromobenzene, room temperature reaction 10 hours adds dilute hydrochloric acid solution 10mL, uses ethyl acetate extraction, uses MgSO 4Drying concentrates again, crosses silicagel column and separates (leacheate benzinum), obtains product 2-tolyl pyrimidine, productive rate: 170mg (100%). 1H?NMR(400MHz,CDCl 3,TMS):δ8.78(d,J=4.8Hz,2H),8.34(d,J=8.0Hz,2H),7.31(d,J=8.0Hz,2H),7.15(d,J=4.8Hz,1H),2.42(s,3H)ppm.MS(EI,m/z):170[M +]
Embodiment 15,
Figure S2008100616751D00082
Under nitrogen protection, in reaction tube, add 4mg (0.5%mmol) double-core Raney nickel 1,4-chloroanisole 142mg (1mmol); the grignard reagent 1.2mmol of methyl bromobenzene, room temperature reaction 10 hours adds dilute hydrochloric acid solution 10mL; use ethyl acetate extraction, use MgSO 4Drying concentrates again, crosses silicagel column and separates (leacheate benzinum), obtains product 2-tolyl pyrimidine, productive rate: 194mg (98%). 1H?NMR(400MHz,CDCl 3,TMS):δ7.51(d,J=8.4Hz,2H),7.45(d,J=8.4HZ,2H),7.24(m,2H),6.97(d,J=8.8Hz,2H),3.84(s,3H),2.37(s,3H)ppm.MS(EI,m/z):199[M +]
Embodiment 16,
Figure S2008100616751D00083
Under nitrogen protection, in reaction tube, add 0.8mg (0.1%mmol) double-core Raney nickel 2, chlorobenzene 101 μ L (1mmol), the grignard reagent 1.2mmol of methyl bromobenzene, room temperature reaction 10 hours adds dilute hydrochloric acid solution 10mL, uses ethyl acetate extraction, uses MgSO 4Drying concentrates again, crosses silicagel column and separates (leacheate benzinum), obtains product 4-methyl biphenyl, productive rate: 129mg (77%). 1H?NMR(400MHz,CDCl 3,TMS):δ7.57(d,J=8.0Hz,2H),7.49(d,J=8.0Hz,2H),7.43(t,J=7.6HZ,2H),7.32(t,J=7.6HZ,1H),7.24(t,J=7.6Hz,2H),2.38(s,3H)ppm.MS(EI,m/z):168[M +].
Embodiment 17,
Figure S2008100616751D00084
Under nitrogen protection, in reaction tube, add 1.6mg (0.2%mmol) double-core Raney nickel 1,2.6mg (1%mmol) triphenylphosphine, 4-methyl chlorobenzene 120 μ L (1mmol), phenyl boric acid 145mg (1.2mmol), K 3PO 4422mg (2mmol), 3mL toluene, 80 ℃ were reacted 3 hours, added entry 10mL to reactant liquor, used ethyl acetate extraction, used MgSO 4Drying concentrates again, crosses silicagel column and separates (leacheate benzinum), obtains product 4-methyl biphenyl, productive rate: 164mg (98%). 1H?NMR(400MHz,CDCl 3,TMS):δ7.57(d,J=8.0Hz,2H),7.49(d,J=8.0Hz,2H),7.43(t,J=7.6Hz,2H),7.32(t,J=7.6Hz,1H),7.24(t,J=7.6Hz,2H),2.38(s,3H)ppm.MS(EI,m/z):168[M +].
Embodiment 18,
Figure S2008100616751D00091
Under nitrogen protection, in reaction tube, add 1.6mg (0.2%mmol) double-core Raney nickel 2,2.6mg (1%mmol) triphenylphosphine, 4-methyl chlorobenzene 120 μ L (1mmol), phenyl boric acid 145mg (1.2mmol), K 3PO 4422mg (2mmol), 3mL toluene, 80 ℃ were reacted 3 hours, added entry 10mL to reactant liquor, used ethyl acetate extraction, used MgSO 4Drying concentrates again, crosses silicagel column and separates (leacheate benzinum), obtains product 4-methyl biphenyl, productive rate: 164mg (98%). 1H?NMR(400MHz,CDCl 3,TMS):δ7.57(d,J=8.0Hz,2H),7.49(d,J=8.0Hz,2H),7.43(t,J=7.6Hz,2H),7.32(t,J=7.6Hz,1H),7.24(t,J=7.6Hz,2H),2.38(s,3H)ppm.MS(EI,m/z):168[M +].
Embodiment 19,
Figure S2008100616751D00092
Under nitrogen protection, in reaction tube, add 1.6mg (0.2%mmol) double-core Raney nickel 1,2.6mg (1%mmol) triphenylphosphine, 4-trifluoromethyl chlorobenzene 180mg (1mmol), phenyl boric acid 145mg (1.2mmol), K 3PO 4422mg (2mmol), 3mL toluene, 80 ℃ were reacted 3 hours, added entry 10mL to reactant liquor, used ethyl acetate extraction, used MgSO 4Drying concentrates again, crosses silicagel column and separates (leacheate benzinum), obtains product 4-trifluoromethyl-biphenyl, productive rate: 200mg (100%). 1H?NMR(400MHz,CDCl 3,TMS):δ7.68(s,4H),7.59(d,J=7.2Hz,2H),7.48(t,J=7.2Hz,2H),7.41(t,J=7.2Hz,1H)ppm.MS(EI,m/z):222[M +]
Embodiment 20,
Figure S2008100616751D00093
Under nitrogen protection, in reaction tube, add 1.6mg (0.2%mmol) double-core Raney nickel 1,2.6mg (1%mmol) triphenylphosphine, 4-methoxyl group chlorobenzene 142mg (1mmol), phenyl boric acid 145mg (1.2mmol), K 3PO 4422mg (2mmol), 3mL toluene, 80 ℃ were reacted 3 hours, added entry 10mL to reactant liquor, used ethyl acetate extraction, used MgSO 4Drying concentrates again, crosses silicagel column and separates (leacheate benzinum), obtains product 4-methoxyl biphenyl, productive rate: 180mg (98%). 1H?NMR(400MHz,CDCl 3,TMS):δ?7.55(m,4H),7.43(m,2H),7.31(m,1H),6.98(d,J=8.4Hz,2H),3.85(s,3H)ppm.MS(EI,m/z):184[M +].

Claims (3)

1. the dinuclear nickel cross-coupling reaction catalyst that nitrogen heterocycle carbine ligand supports is characterized in that the N-heterocyclic carbine compound with the pyrazoles functionalization is a part, and with the hydroxyl bridging, its cationic molecule formula is between two nickle atoms:
Wherein, R represent methylidene pyridine, pyridine, pyrimidine, methyldiphenyl base phosphorus, ethyl diphenylphosphine and derivative thereof, the dotted line in the N-heterocyclic carbine molecular formula is represented imidazoles, and benzimidazole and derivative thereof, anion are PF 6 -, Cl -Perhaps BF 4 -
2. according to the dinuclear nickel cross-coupling reaction catalyst of the described a kind of nitrogen heterocycle carbine ligand support of claim 1, it is characterized in that the molecular formula of described nitrogen heterocycle carbine ligand is:
R represent methylidene pyridine wherein, pyridine, pyrimidine, methyldiphenyl base phosphorus, ethyl diphenylphosphine and derivative thereof, the dotted line in the N-heterocyclic carbine molecular formula is represented imidazoles, benzimidazole and derivative thereof.
3. preparation method of the dinuclear nickel cross-coupling reaction catalyst that supports of nitrogen heterocycle carbine ligand according to claim 1, it is characterized in that: be solvent with the acetonitrile, adding mol ratio is 1: 3-1: 6 nitrogen heterocycle carbine ligand and silver oxide, stir lucifuge reaction 10-15 hour; Add Ni (DME) Cl 2Perhaps Ni (PPh 3) 2Cl 2, Ni (DME) Cl 2Perhaps Ni (PPh 3) 2Cl 2With the nitrogen heterocycle carbine ligand mol ratio be 2: 1-3: 1, filter, filtrate concentrates, add ether and separate out yellow solid, yellow solid is washed 2-3 time with ethanol, ether successively, with the acetonitrile dissolving, slowly add ether again, crystallization obtains the dinuclear nickel cross-coupling reaction catalyst that nitrogen heterocycle carbine ligand supports.
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