A kind of method of hydrazine hydrate microwave reduction carbon-carbon double bond
Technical field
The present invention relates to a kind of carbon-carbon double bond that reduces and prepare the synthetic method of carbon-carbon single bond compound, belong to the organic synthesis field.
Background technology
Since Vanderhoff in 1969 applied microwave radiotechnology in organic synthesis first, had very big development through the technology of the development microwave radiation catalytic synthesis of organic substance of decades.Compare with traditional synthetic method, microwave-assisted synthesis can make the reaction times obviously shorten, and reduces environmental pollution, improves reaction yield, simplifies post-processing step.Can reduce cost in many cases, obtain energy-conservation, consumption reduction and the benefit that reduces discharging.Present under the situation that the mechanism of microwave radiation promotion chemical reaction it be unclear that, microwave irradiation just progressively forms a subject---microwave chemical.Be described as the organic chemistry of 21 century, huge development prospect arranged in the organic synthesis field.
The reduction of carbon-carbon double bond is the important reaction of a class in the organic synthesis.In organic synthesis, usually adopt some reaction to form carbon-carbon double bond, obtain the product of corresponding carbon-carbon single bond again by the certain method reduction, reach the purpose that prolongs carbochain.Some even employing asymmetry catalysis reductive method obtain the hand-type product and reach synthetic purpose.The method of the formation carbon-carbon double bond that has existed comprises: Witting reaction and relevant reaction thereof, Julia-Kocienski reaction, Ramberg-
Reaction, aldol reaction, Knoevenagel reaction, and nearest olefin metathesis reaction and allyl substitution reaction.These reactions have brought unlimited possibility for the reduction reaction of carbon-carbon double bond.
The reduction carbon-carbon double bond uses hydrogen and out-phase transition metal-catalyzed usually, such as: Rh/C, Pd/C, Raney Ni, Adams catalyzer (PtO
2).Another kind is to adopt the homogeneous transition metal complex compound, such as the Wilkinson catalyzer.Most of asymmetric hydrogenations are by the homogeneous catalyst catalyzed reaction.
Though these hydrogenations by the transition metal mediation are very efficient, have very big shortcoming.When using heterogeneous catalyst catalytic reduction benzylic, allylic, when the alcohols of propargyl and aminated compounds, usually invalid.(Wilkinson,H.S.;Hett,R.;Tanoury,G.J.;Senanayake,C.H.;Wald,S.A.Org.Proc.Res.DeV.2000,4,567-570)。When compound has corresponding C bz and Alloc protecting group, can not be with hydrogenation hydrogenation (Galletti, the A.M.R. of transition metal mediation; Bonaccorsi, F.; Calvani, F.; Di Bugno, C.Catal.Commun.2006,7,896-900).And some are similar to nitro, benzyl ketone, and the functional group of fragrant halogen also can very fast being reduced in such reduction system.
Hydrogenation for homogeneous phase and the mediation of heterogeneous transition metal has a very common shortcoming not obtain enough concerns---double-bond isomerization side reaction ((a) Nakai, T.; Yajima, A.; Akasaka, K.; Kaihoku, T.; Ohtaki, M.; Nukada, T.; Ohrui, H.; Yabuta, G.Biosci.Biotechnol.Biochem.2005,69,2401-2408. (b) Schwartz, B.D.; Hayes, P.Y.; Kitching, W.; De Voss, J.J.J.Org.Chem.2005,70,3054-3065. (c) Rakoff, H.; Rohwedder, W.K.Lipids 1992,27,567-569).These double bond isomerization reactions can cause stereoisomers, the racemization of open loopization and more difficult detection.
Except that transition metal-catalyzed reduction, some other method of reducing are also arranged, wherein a kind of for using hydrazine reduction carbon-carbon double bond.Hydrazine at first becomes imide in reaction, imide has avoided reduction to be similar to the two keys of the such polarization of carbonyl or the like by cycloaddition mechanism hydro-reduction carbon-carbon double bond, also can not cause double-bond isomerization.Be a kind of gentleness, the reduction reaction that selectivity is very high.(Pasto,D.J.;Taylor,R.T.Reductions?with?Diimide?in?Organic?Reactions;V?Paquette?L.A.,Ed.;J.Wiley&Sons:New?York,1991;40,91-150)。Because hydrazine can form more stable hydrazine hydrate in water, that sells on the market mostly is the hydrazine hydrate reagent of (40%~80% mass concentration) as reductive reagent hydrazine.Hereinafter be expressed as the hydrazine hydrate that can be regarded as of hydrazine.
Need become imide during hydrazine reduction carbon-carbon double bond, usually need the existence of oxygenant in this process.Hydrazine-the oxidizer systems that has now had is respectively: (1) hydrazine-oxygen system; (2) hydrazine-oxidizer systems, oxygenant commonly used are hydrogen peroxide, Potassium Iodate and potassium bichromate etc.; (3) hydrazine-oxygen-cupric ion system and hydrazine-oxygenant-cupric ion system.Having does not need the hydrazine of oxygenant restoring system report yet, such as: hydrazine-hydrogenation catalyst system, hydrazine-hydrazine sodium system etc.(Zhong Tongsheng etc., the hydrazine utilization in organic synthesis, chemistry circular, 1964,11,39-41) its reaction mechanism is not an imide ring addition hydrogenation mechanism, has the shortcoming of our above-mentioned common reduction reaction.
For hydrazine-oxygen system, the Falciola hydrazine hydrate, uncovered reactor hydrogenation becomes stearic acid to obtain better yield along oleic acid and elaidic acid.(P.Falciola,et?al,Ann.Chim.Appl.1914,2,351;Chem.Zntn,I,1917,926.P.Falciola,et?al,Gazz,Chem.Ital,1920,50,162;Chem.Zntn,III,1920,276)。1956, Aylward used the same method reduction is contained one, and the oleic acid of two two keys is extended for the eleostearic acid (F, Aylward, et al, ibid, 1957,7,137) that reduction contains conjugated triene.It is required long reaction time that these class methods have a bigger shortcoming, reduction efficiency low (about 70%), and practicality is not high.
Hydrazine-oxidizer systems, hydrazine-oxygen-cupric ion system and hydrazine-oxygenant-cupric ion system, the time that responds is short, the reduction efficiency advantages of higher, but have problems such as heavy metal environmental pollution, aftertreatment complexity, production cost height.
Utilization microwave heating hydrazine reductive report has as follows in the existing documents and materials: calendar year 2001 Andr á s Vass etc. has reported that the hydrazine of utilization aluminum oxide support uses method (the Andr á s Vass et al of solvent-free reaction nitro compound reducing under microwave condition, Tetrahedron Letters, 2001,42,5347-5349).E Parquet in 1997 etc. have reported that utilization microwave heating promotes Wolff-Kishner reductive research (E Parquet et al, Journal ofChemical Education, 1997,74,1225).The complex compound of microwave heating hydrazine hydrate and zinc prepare nano zine oxide (D.K.Bhat, Nanoscale Res Lett, 2008,3,31-35).Have in the materials chemistry in recent years the report that uses carry out microwave radiation heating hydrazine hydrate, reduction-oxidation graphite to make Graphene (SuniinPark, Nature Nanotechnology, 2009,4,217-224).
Use microwave radiation, hydrazine reduction carbon-carbon double bond organic compound makes the report of carbon-carbon single bond organic compound and does not see.With respect to using transition metal, single hydrazine reducing environment of using is polluted still less, and more cheap, aftertreatment is simpler, the intact hydrazine of unreacted can be removed by the method that bubbling air makes it to become the nitrogen G﹠W, is the reductive agent (corresponding Green Chemistry oxygenant is a hydrogen peroxide) of Green Chemistry first-selection.And add thermal reduction with respect to hydrazine, and microwave hydrazine reduction required time is shorter, reduction efficiency is higher, and energy consumption still less meets low-carbon economy, the practicality height.More and more receive the concern of the public and government at modern environment, and chemical industry is received very big social pressures as a big source of polluting, this wherein has many-sided reason but makes water can reduce pollution greatly as reaction solvent, and since water be easy to get cheaply can be bigger increase economic efficiency, be the solvent that compound probability is dreamed of.Helpless most reaction can't be used water as solvent, has influenced the development of chemical industry.The reaction of water as solvent has in recent years caused that scientific circles and industry member pay close attention to widely.International magazine Chem.Review goes up even has occurred the summary of water as solvent reaction! This patent adopts water as solvent as far as possible, regulates its solubleness until dissolving for insoluble compound in water with ethanol.Adopt microwave heating to promote reduction, have environmental friendliness, reaction temperature and, characteristics such as economic worth height.
Summary of the invention
Technical problem to be solved by this invention is at the deficiencies in the prior art, and a kind of selectivity height is provided, and the while is the method for reducing of carbon-carbon double bond efficiently.
Concrete technical scheme of the present invention is: add the carbon-carbon double bond compound R in uncovered reaction vessel
1R
2CCHR
3, solvent, hydrazine hydrate, under the microwave condition, 65~95 ℃ of reaction 10~60min.
Reaction formula is as follows:
R
1, R
2Be aryl independently, phenol aryl, alkyl, pure alkyl, ether, thioether group, carboxylic acid group, carboxylic acid ester groups or hydrogen; R
3Be hydrogen, carboxylic acid group or carboxylic acid ester groups.
Further,
Solvent is the mixed solvent of water or second alcohol and water, and in the mixed solvent of second alcohol and water, the volume ratio of second alcohol and water is 2: 1~1: 20.
Solvent adding amount is with every mole of carbon-carbon double bond compound 1000~2500ml.
The consumption of hydrazine hydrate is 4~8 times of molar weights of carbon-carbon double bond compound.
The hydrazine hydrate specification is the hydrazine hydrate of 40~100wt% concentration.
Microwave power is 400W~1200W.
Whether the aftertreatment purification process is dissolved in solvent and difference by product.(1) be dissolved in solvent: water-alcohol mixeding liquid is made solvent, and ethanol is removed in first underpressure distillation, and adding hydrochloric acid again, to transfer pH be 1~4; The hydrochloric acid that directly adds that uses water as solvent is transferred pH to 1~4, uses ethyl acetate extraction again, last fractionation or recrystallization, and vacuum-drying gets product.(2) be insoluble to solvent, can adding hydrochloric acid, to transfer pH be 1~4, filters, and vacuum-drying gets product.
The method utilization solvent and the airborne dioxygen oxidation hydrazine of the utilization microwave hydrazine reduction carbon-carbon double bond of this patent report, microwave radiation itself also can promote the decomposition of hydrazine, become reducing compounds such as imide, improved reduction and renderd a service, reduced the reduction required time, avoided side reaction, reduced environmental pollution and advantages such as post-treating method is simple are arranged.Water or alcohol-water mixing solutions are made solvent, and aftertreatment is simple, and is pollution-free, economy.In sum, the present invention has following beneficial effect: shortening reaction times, raising reaction yield and product purity, save energy, minimizing environmental pollution, reduce reaction cost.
In order to set forth using value of the present invention and superiority better, existing synthetic explanation as an example with esmolol intermediate para hydroxybenzene propionic acid.
The synthetic common method of para hydroxybenzene propionic acid is: palladium carbon hydrogenating reduction (PCT Int.Appl.2008147553.04Dec2008).Raney Ni adds the hydrogen reduction.Produce hydrogen and directly do not feed hydrogen with highly basic and hydrazine, add Raney Ni reduction (Zou Pei etc., contemporary Chinese is used pharmaceutical journal, 1999,16,6).Have recently the report that uses 1 palladium carbon microwave reduction (JohnF Quinn et al.Tetrahedron Letters, 2008,49,6137-6140).These method of reducing use metal as catalyzer without exception, and shortcomings such as isomerization that we say previously and environmental pollution are arranged.Simultaneously because solvent how with organic solvent reaction cost height such as alcohol, pollutes big.And adopt hydrogen to do to go back that original reagent need pressurize and special reaction unit has risk of explosion.
The present invention adopts hydrazine hydrate to make reductive agent, water as solvent, the reduction paired hydroxy phenylpropionic acid of p-hydroxybenzene vinylformic acid (seeing embodiment 1), with respect to 1,4-cyclohexadiene palladium carbon microwave reduction (reaction times 5min) is though many 10min of reaction times, but avoided using 1 of costliness, the 4-cyclohexadiene, palladium metal, organic solvent.Superiority in the environmental protection is arranged economically.There is the tangible reaction times short with respect to other three kinds of method of reducing equally, the productive rate height, good in economic efficiency, environment protection, advantages such as convenient post-treatment.Be a kind of advanced person, practical reduction mode.
Embodiment:
Further introduce the present invention by following embodiment, but do not limit protection scope of the present invention.
Embodiment 1
Synthesizing of esmolol intermediate para hydroxybenzene propionic acid: adding p-hydroxybenzene vinylformic acid in microwave reactor (1g, 6.05mmol), distilled water (6mL), (reconcile temperature of reaction is 80 ℃ to the 80wt% hydrazine hydrate for 3.05g, 48.4mmol) vigorous stirring, microwave power is 600W, reaction 15min.Reaction finish to wait for that system temperature reduces to room temperature, and the cryosel acid for adjusting pH that adds 2mol/L is 1, leaves standstill, filter white solid, get distilled water and clean solid (2mL * 2), vacuum-drying, product para hydroxybenzene propionic acid (0.915g, 5.51mmol).Productive rate 91%, purity 98%.Fusing point 126-130 ℃,
1H NMR (400MHz, DMSO) δ 9.33 (s, 1H), 7.04 (d, J=8.5Hz, 2H), 6.70 (d, J=8.5Hz, 2H), 2.74 (t, J=7.6Hz, 2H), 2.49 (t, J=7.6Hz, 2H).
Embodiment 2
Succinic Acid synthetic: in microwave reactor, add maleic acid (1g, 8.62mmol), water (20mL), (reconcile temperature of reaction is 65 ℃ to the 40wt% hydrazine hydrate for 4.32g, 34.5mmol) vigorous stirring, and microwave power is 400W, reaction 10min.Reaction finishes the wait system temperature and reduces to room temperature, and the hydrochloric acid adjusting pH that adds 2mol/L is 1, ethyl acetate extraction 3 times (25ml * 3), anhydrous sodium sulfate drying 2h, ethyl acetate is removed in underpressure distillation, vacuum-drying, the product Succinic Acid (0.916g, 7.76mmol).Productive rate 90%, purity 95%
1H NMR (400MHz, CDCl
3) δ 1.35 (t, J=6.9Hz, 4H).
Embodiment 3
Synthesizing of 3-phenylpropionic acid formicester: adding styracin formicester in microwave reactor (1g, 6.17mmol), distilled water and alcohol mixeding liquid (1: 1,6mL), 80wt% hydrazine hydrate (3.09g, 49.4mmol) vigorous stirring, reconciling temperature of reaction is 70 ℃, and microwave power is 600W, reaction 20min.Reaction finishes the wait system temperature and reduces to room temperature, and ethanol is removed in underpressure distillation, and the hydrochloric acid adjusting pH that adds 2mol/L is 4, ethyl acetate extraction 3 times (15mL * 3), anhydrous sodium sulfate drying 2h, ethyl acetate is removed in underpressure distillation, product 3-phenylpropionic acid formicester (0.973g, 5.92mmol).Productive rate 96%, purity 97%.
1HNMR(400MHz,CDCl
3)δ7.21(dd,J=13.3,6.0Hz,3H),7.13(t,J=6.2Hz,3H),3.59(s,3H),2.90-2.85(m,2H),2.56(t,J=7.9Hz,2H)。
Embodiment 4
Synthesizing of 2-phenylpropionic acid methyl esters: adding 2-phenylacrylic acid methyl esters in microwave reactor (1g, 6.2mmol), alcohol-water (1: 1,6mL), 80wt% hydrazine hydrate (3.08g, 49.3mmol) vigorous stirring, reconciling temperature of reaction is 70 ℃, and microwave power is 600W, reaction 20min.Reaction finishes the wait system temperature and reduces to room temperature, and ethanol is removed in underpressure distillation, and the hydrochloric acid adjusting pH that adds 2mol/L is 4, ethyl acetate extraction 3 times (15ml * 3), anhydrous sodium sulfate drying 2h, ethyl acetate is removed in underpressure distillation, product 2-phenylpropionic acid methyl esters (0.947g, 5.77mmol).Productive rate 93%, purity 98%.
1HNMR?(400MHz,CDCl
3)δ7.23±7.35(m,5H),3.72(q,J=7.2Hz,1H),3.65(s,3H),1.50(d,J=7.2Hz,3H)。
Embodiment 5
Synthesizing of 2-ethylphenol: adding 2-phenol ethylene in microwave reactor (1g, 7.45mmol), alcohol-water (1: 20,6ml), 100wt% hydrazine hydrate (2.98g, 59.6mmol) vigorous stirring, the conditioned reaction temperature is 95 ℃, and microwave power is 1200W, reaction 60min.Reaction finishes the wait system temperature and reduces to room temperature, and ethanol is removed in underpressure distillation, and the hydrochloric acid accent pH that adds 2mol/L is 3, ethyl acetate extraction 3 times (15ml * 3), anhydrous sodium sulfate drying 2h, ethyl acetate is removed in underpressure distillation, product 2-ethylphenol (0.994g, 7.30mmol).Productive rate 98%, purity 98%.
1H?NMR(400MHz,CDCl
3)δ7.01(dd,J=7.4,1.4Hz,1H),6.93(td,J=7.7,1.7Hz,1H),6.71(ddd,J=12.6,9.5,4.4Hz,2H),6.29(s,1H),2.53-2.46(m,2H),1.61-1.49(m,2H),0.87(t,J=7.4Hz,3H)。
Embodiment 6
Synthesizing of propyl group phenyl thioether: adding allyl phenyl thioether in microwave reactor (1g, 6.66mmol), alcohol-water (1: 1,6ml), 80wt% hydrazine hydrate (3.33g, 53.2mmol) vigorous stirring, the conditioned reaction temperature is 85 ℃, and microwave power is 800W, reaction 30min.Reaction finishes the wait system temperature and reduces to room temperature, ethanol is removed in underpressure distillation, the hydrochloric acid accent pH that adds 2mol/L is 3, ethyl acetate extraction 3 times (15ml * 3), anhydrous sodium sulfate drying 2h, ethyl acetate is removed in underpressure distillation, vacuum-drying, product propyl group phenyl thioether (0.943g, 6.19mmol).Productive rate 93%, purity 96%.
1H?NMR?(400MHz,CDCl
3)δ7.22~7.34(m,4H),7.10~7.19(m,1H),2.89(t,J=7.3Hz,2H),1.66(tq,J=7.4,7.3Hz,2H),1.01(t,J=7.4Hz,3H)
Embodiment 7
Propyl group phenyl ether synthetic: in microwave reactor, add allyl phenyl ether (1g, 7.45mmol), alcohol-water (2: 1,6ml), 80wt% hydrazine hydrate (3.73g, 59.6mmol) vigorous stirring, the conditioned reaction temperature is 85 ℃, and microwave power is 800W, reaction 30min.Reaction finishes the wait system temperature and reduces to room temperature, ethanol is removed in underpressure distillation, the hydrochloric acid accent pH that adds 2mol/L is 3, ethyl acetate extraction 3 times (15ml * 3), anhydrous sodium sulfate drying 2h, ethyl acetate is removed in underpressure distillation, vacuum-drying, product propyl group phenyl thioether (0.954g, 7.00mmol).Productive rate 94%, purity 96%.
1H?NMR?(400MHz,CDCl
3)δ7.20~7.35(m,5H),4.49(s,2H),3.42(t,J=6.8Hz,2H),1.63(tq,J=6.8,7.4Hz,2H),0.94(t,J=7.4Hz,3H)
Embodiment 8
Synthesizing of 1-phenyl-1-propyl alcohol: adding 1-phenyl-2-alkene-1-propyl alcohol in microwave reactor (1g, 7.45mmol), alcohol-water (1: 10,6ml), 80wt% hydrazine hydrate (3.73g, 59.6mmol) vigorous stirring, the conditioned reaction temperature is 95 ℃, and microwave power is 1000W, reaction 30min.Reaction finishes the wait system temperature and reduces to room temperature, and the hydrochloric acid accent pH that adds 2mol/L is 4, ethyl acetate extraction 3 times (15ml * 3), anhydrous sodium sulfate drying 2h, ethyl acetate is removed in underpressure distillation, vacuum-drying, product propyl group phenyl thioether (0.923g, 6.78mmol).Productive rate 91%, purity 96%.
1H?NMR(400MHz,CDCl
3)δ7.23~7.35(m,5H),4.58(t,J=6.6Hz,1H),2.71(s,1H),1.64~1.92(m,2H),0.90(t,J=7.4Hz,3H)