CN110551036A - 一种铱/手性亚磷酸酯-吡啶催化亚胺不对称氢化方法 - Google Patents
一种铱/手性亚磷酸酯-吡啶催化亚胺不对称氢化方法 Download PDFInfo
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- 150000002466 imines Chemical class 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 24
- 229910052741 iridium Inorganic materials 0.000 title claims abstract description 22
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000009876 asymmetric hydrogenation reaction Methods 0.000 title claims abstract description 20
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 title claims abstract description 17
- JUJWROOIHBZHMG-UHFFFAOYSA-N pyridine Substances C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 239000003446 ligand Substances 0.000 claims abstract description 32
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 23
- 239000003054 catalyst Substances 0.000 claims abstract description 21
- 150000001412 amines Chemical class 0.000 claims abstract description 11
- 238000002360 preparation method Methods 0.000 claims abstract description 9
- 238000011065 in-situ storage Methods 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 29
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 24
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
- RIYIAJROALWMMR-UHFFFAOYSA-N phosphorous acid;pyridine Chemical compound OP(O)O.C1=CC=NC=C1 RIYIAJROALWMMR-UHFFFAOYSA-N 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 125000000524 functional group Chemical group 0.000 claims description 12
- 150000001408 amides Chemical class 0.000 claims description 11
- 229910052739 hydrogen Inorganic materials 0.000 claims description 11
- 239000001257 hydrogen Substances 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- SIOXPEMLGUPBBT-UHFFFAOYSA-N picolinic acid Chemical compound OC(=O)C1=CC=CC=N1 SIOXPEMLGUPBBT-UHFFFAOYSA-N 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 10
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 9
- 125000003118 aryl group Chemical group 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 7
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical group ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 6
- BXMJNGVLZAWGJH-UHFFFAOYSA-N [Ir].C1CCC=CC=CC1 Chemical compound [Ir].C1CCC=CC=CC1 BXMJNGVLZAWGJH-UHFFFAOYSA-N 0.000 claims description 6
- 239000000047 product Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- QCHAVHXSBZARBO-UHFFFAOYSA-N (r)-monophos Chemical compound C1=CC2=CC=CC=C2C2=C1OP(N(C)C)OC1=C2C2=CC=CC=C2C=C1 QCHAVHXSBZARBO-UHFFFAOYSA-N 0.000 claims description 5
- BMTZEAOGFDXDAD-UHFFFAOYSA-M 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholin-4-ium;chloride Chemical compound [Cl-].COC1=NC(OC)=NC([N+]2(C)CCOCC2)=N1 BMTZEAOGFDXDAD-UHFFFAOYSA-M 0.000 claims description 5
- 239000012024 dehydrating agents Substances 0.000 claims description 5
- 229940081066 picolinic acid Drugs 0.000 claims description 5
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- 125000000217 alkyl group Chemical group 0.000 claims description 4
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- 230000002829 reductive effect Effects 0.000 claims description 4
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- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical class [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 3
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- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 150000001491 aromatic compounds Chemical group 0.000 claims description 2
- 229910052736 halogen Inorganic materials 0.000 claims description 2
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- JJVKJJNCIILLRP-UHFFFAOYSA-N 2-ethyl-6-methylaniline Chemical compound CCC1=CC=CC(C)=C1N JJVKJJNCIILLRP-UHFFFAOYSA-N 0.000 abstract description 4
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- WVQBLGZPHOPPFO-UHFFFAOYSA-N 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(1-methoxypropan-2-yl)acetamide Chemical compound CCC1=CC=CC(C)=C1N(C(C)COC)C(=O)CCl WVQBLGZPHOPPFO-UHFFFAOYSA-N 0.000 abstract description 3
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- IAZDPXIOMUYVGZ-WFGJKAKNSA-N Dimethyl sulfoxide Chemical compound [2H]C([2H])([2H])S(=O)C([2H])([2H])[2H] IAZDPXIOMUYVGZ-WFGJKAKNSA-N 0.000 description 18
- 238000004128 high performance liquid chromatography Methods 0.000 description 13
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- 238000005160 1H NMR spectroscopy Methods 0.000 description 5
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- HEDRZPFGACZZDS-MICDWDOJSA-N Trichloro(2H)methane Chemical compound [2H]C(Cl)(Cl)Cl HEDRZPFGACZZDS-MICDWDOJSA-N 0.000 description 4
- 238000005984 hydrogenation reaction Methods 0.000 description 4
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 4
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- 238000001308 synthesis method Methods 0.000 description 3
- 125000004172 4-methoxyphenyl group Chemical group [H]C1=C([H])C(OC([H])([H])[H])=C([H])C([H])=C1* 0.000 description 2
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- 239000007809 chemical reaction catalyst Substances 0.000 description 2
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 2
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 125000005745 ethoxymethyl group Chemical group [H]C([H])([H])C([H])([H])OC([H])([H])* 0.000 description 2
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- 125000004184 methoxymethyl group Chemical group [H]C([H])([H])OC([H])([H])* 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 229940017219 methyl propionate Drugs 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
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- WVQBLGZPHOPPFO-LBPRGKRZSA-N (S)-metolachlor Chemical compound CCC1=CC=CC(C)=C1N([C@@H](C)COC)C(=O)CCl WVQBLGZPHOPPFO-LBPRGKRZSA-N 0.000 description 1
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- CUZLJOLBIRPEFB-UHFFFAOYSA-N 1-methoxypropan-2-one Chemical compound COCC(C)=O CUZLJOLBIRPEFB-UHFFFAOYSA-N 0.000 description 1
- YXWIRQHVEQIJOV-NSHDSACASA-N 2-ethyl-n-[(2s)-1-methoxypropan-2-yl]-6-methylaniline Chemical compound CCC1=CC=CC(C)=C1N[C@@H](C)COC YXWIRQHVEQIJOV-NSHDSACASA-N 0.000 description 1
- 239000005617 S-Metolachlor Substances 0.000 description 1
- NEOYGRJJOGVQPO-UHFFFAOYSA-N alpha-(2,6-dimethylanilino)-propionic acid methyl ester Natural products COC(=O)C(C)NC1=C(C)C=CC=C1C NEOYGRJJOGVQPO-UHFFFAOYSA-N 0.000 description 1
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- KTWOOEGAPBSYNW-UHFFFAOYSA-N ferrocene Chemical compound [Fe+2].C=1C=C[CH-]C=1.C=1C=C[CH-]C=1 KTWOOEGAPBSYNW-UHFFFAOYSA-N 0.000 description 1
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- UUMWWWHCQIKRJM-UHFFFAOYSA-N n-(2-ethyl-6-methylphenyl)methanimine Chemical compound CCC1=CC=CC(C)=C1N=C UUMWWWHCQIKRJM-UHFFFAOYSA-N 0.000 description 1
- 125000003261 o-tolyl group Chemical group [H]C1=C([H])C(*)=C(C([H])=C1[H])C([H])([H])[H] 0.000 description 1
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- 238000006268 reductive amination reaction Methods 0.000 description 1
- DPKBAXPHAYBPRL-UHFFFAOYSA-M tetrabutylazanium;iodide Chemical compound [I-].CCCC[N+](CCCC)(CCCC)CCCC DPKBAXPHAYBPRL-UHFFFAOYSA-M 0.000 description 1
- 229930192474 thiophene Chemical group 0.000 description 1
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- 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
- B01J31/2282—Unsaturated compounds used as ligands
- B01J31/2295—Cyclic compounds, e.g. cyclopentadienyls
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Abstract
本发明公开了一种铱/手性亚磷酸酯‑吡啶催化亚胺不对称氢化方法,该方法以手性亚磷酸酯‑吡啶(P,N)配体与金属铱前驱体反应原位制备配合物为催化剂,亚胺不对称加氢制备手性胺。本发明配体制备简单,催化剂用量低,操作简便,且可实现连续操作,适于大规模制备手性胺,产物的对映体过量值达85%以上,并且本发明对于精异丙甲草胺中间体的合成时2‑乙基‑6‑甲基苯胺/催化剂(S/C)为500000具有较好的结果,达到95%收率,91%对映选择性,具有很好的工业实用性。
Description
技术领域
本发明属于有机合成领域,具体涉及一种铱/手性亚磷酸酯-吡啶催化亚胺不对称氢化方法。
背景技术
手性胺化合物是重要的有机合成中间体,可用于制备具有生物活性的各种天然及非天然化合物。近年来,通过亚胺的不对称催化氢化反应制备手性胺化合物取得了很大成功[(a)H.-U.Blaser,F.Spinder in Handbook of Homogeneous Hydrogenation(Eds.:J.G.de Vries,C.J.Elsevier),Wiley-VCH,Weinheim,2007,pp.1193;(b)C.Claver,E.Fernandez in Morden Reduction Methods(Eds.:P.Anderson,I.Munslow),Wiley-VCH,Weinheim,2008,pp.237;(c)H.-U.Blaser,F.Spinder in Comprehensive AsymmetricCatalysis(Eds.:E.Jacobsen,A.Pfaltz,H.Yamamoto),Springer,Berlin,1999,pp.247.]但是这些催化体系存在着诸如反应活性低、底物范围窄、反应条件苛刻等问题,特别对于如何通过不对称催化得到精异丙甲草胺的合成路线,国内外一些有机化学家做了许多不同的尝试,设计并合成了一些不对称催化的催化剂。发现通过不对称氢化(2-甲基-6-乙基苯胺)-亚胺制备精异丙甲草胺中间体是一条可行有效的方法路线。
1975年,Levi等报道一种亚胺的氢化方法,但其对映体过量值(ee值)仅为22%(Levi A.,Modena G.,Scorrano G.J.Chem.Soc.Commun.1975,1,6-7)。1999年,Hans-PeterJalett等利用二茂铁双膦配体催化不对称氢化,将其ee值提高到了76%(Jalett H.P.,Spindler F.,Hanreich R.G.US5886225[P],1999),并实现了产业化。该方法是采用{(R)-1-[(S)-2-二苯基膦基茂铁基]}乙基-二-(3,5-二甲基苯基)膦为配体与铱配合物原位组成催化剂前体,在酸和四丁基碘化铵存在下,于50℃和80大气压氢气压力下,催化2-甲基-6-乙基-N-亚甲基苯胺不对称氢化,得到最高为76%ee的手性胺。但是,该反应所使用的配体合成困难,氢化体系要用大量的酸对设备要求高。因此,发展高活性、高立体选择性、低成本制备手性胺的催化剂,具有十分重要的意义。
发明内容
本发明的目的是提供一种铱/手性亚磷酸酯-吡啶催化亚胺不对称氢化方法。
为实现上述目的,本发明的技术方案如下:
一种铱/手性亚磷酸酯-吡啶催化亚胺不对称氢化方法,该方法采用手性催化剂Ir-L,亚胺不对称氢化制备手性胺;
所述手性催化剂Ir-L由铱-环辛二烯络合物和手性亚磷酸酯-吡啶配体在溶剂中原位配位生成。
一种铱/手性亚磷酸酯-吡啶催化亚胺不对称氢化方法,该方法具体为:
(1)加入铱-环辛二烯络合物及手性亚磷酸酯-吡啶配体,在溶剂中室温搅拌2~5h,原位配位生成手性催化剂Ir-L;
(2)在氮气保护下,加入溶于溶剂的底物亚胺,再加入手性催化剂Ir-L;将其置于高压反应釜中,氢气置换3次,然后通入氢气至20-100bar,20-100℃下反应1-24小时,慢慢释放氢气,除去溶剂后用硅胶柱分离得到产物手性胺。
所述溶剂为二氯甲烷、1,2-二氯乙烷或甲苯;
所述的底物亚胺为:
R1为C1~C10烷基如CH3、CH3CH2等,C3~C12环烷基如环戊基、环己基等,或含有N、S、O、P中一种或二种以上官能团的C1~C10烷基如甲氧甲基、乙氧甲基等,或含有N、S、O、P中一种或二种以上官能团的C3~C10环烷基如2-四氢呋喃基、4-四氢呋喃基等;或芳基等C6-C30内的含或不含N、S、O、P等官能团的芳香基团如苯基、4-甲氧基苯基等;或酯基如COOCH3、COOCH2CH3等
R2为H,C1-C40内的烷基或芳基;
为实现上述目的,本发明的技术方案如下:
本发明所涉及的亚胺和制得的手性胺具有以下结构:
式中:
R1为C1~C10烷基如CH3、CH3CH2等,C3~C12环烷基如环戊基、环己基等,或含有N、S、O、P中一种或二种以上官能团的C1~C10烷基如甲氧甲基、乙氧甲基等,或含有N、S、O、P中一种或二种以上官能团的C3~C10环烷基如2-四氢呋喃基、4-四氢呋喃基等;或芳基等C6-C30内的含或不含N、S、O、P等官能团的芳香基团如苯基、4-甲氧基苯基等;或酯基如COOCH3、COOCH2CH3等
R2为H,C1-C40内的烷基或芳基;
Ar为苯基、2-取代、3-取代、4-取代、2,6-二取代、2,4,6-三取代的芳基等C6-C30内的含或不含N、S、O、P等官能团的芳香基团如2-甲基苯基、3-甲基苯基、4-甲基苯基、2-甲基-6-乙基苯基、噻吩等。
本发明所涉及的手性亚磷酸酯-吡啶(P,N)配体的结构通式如下:
其中:R为芳香化合物如苯基或取代苯基、为氢、烷基或环烷基或卤素中的一种。
所述铱-环辛二烯络合物为:[Ir(COD)Cl]2、Ir(COD)2BF4或Ir(COD)2BARF。
所述反应体系中所述铱浓度为0.0001-0.01mol/l,所述配体与铱的摩尔比为1-5:1。
所述亚胺底物和催化剂的摩尔比为100-500000:1
本发明所涉及的手性亚磷酸酯-吡啶配体合成方法如下述反应方程式所示:
所述的手性亚磷酸酯-吡啶配体的合成方法如下:
(1)向单口瓶中,加入吡啶甲酸,(S)-NOBIN和THF,室温搅拌10~20min充分溶解后,再加入脱水剂DMTMM;室温继续搅拌并用TLC跟踪至原料NOBIN基本消失;吡啶甲酸、(S)-NOBIN与脱水剂DMTMM的摩尔比为:1.2~10:1:1.2~10;加入20ml水,搅拌10min分离水层并用乙醚萃取三次,每次20ml,合并有机层,依次用5ml饱和碳酸氢钠溶液,饱和食盐水和5%的稀盐酸溶液洗后,无水硫酸钠干燥,过滤,减压浓缩后的粗产品用25g硅胶柱层析得酰胺白色固体,
(2)在氮气下,将上述酰胺白色固体和(S)-MonoPhos加入到干燥过的Schlenk瓶中,加入甲苯,加热慢慢溶清,回流几个小时后有白色沉淀出现,所述酰胺白色固体与(S)-MonoPhos摩尔比为:1:1~5;24h后TLC显示酰胺基本消失,冷却至室温;抽滤并用2ml甲苯洗滤饼两次,真空干燥,得白色固体,即手性亚磷酸酯-吡啶配体。
本发明的有益效果是:与其它合成手性胺方法相比,本方法用于亚胺还原氢化的手性手性亚磷酸酯-吡啶(P,N)配体配体合成简单、价格低廉、适宜公斤级生产,而且铱/手性亚磷酸酯-吡啶体系催化活性高、对映选择性高,产物的对映体过量值(ee值)达85%以上,还原胺化反应操作简单、条件温和、原子经济性高,适合工业化生产,并且本发明对于精异丙甲草胺中间体的合成时2-乙基-6-甲基苯胺/催化剂(S/C)为500000具有较好的结果,达到95%收率,91%对映选择性,具有很好的工业实用性。
具体实施方式
下面的实施例将对本发明予以进一步的说明,但并不因此而限制本发明。核磁共振是通过Bruker核磁共振仪测定,高效液相色谱(HPLC)是通过Agilent1100系列高效液相色谱测定。GC分析条件如下色谱柱:SE-54,进样口温度:250度,检测器温度:250度,柱温:初始温度50度保持2分钟、然后10度/分钟升至250度,再保持5分钟。
实施例1
本发明所涉及的配体合成方法如下述反应方程式所示:
其中,(S,S)-Ia:R=H;(R,S)-Ib:R=H;(S,S)-Ic:R2=Me;(S,S)-Id:R=Cl etc。
1制备配体(S,S)-Ia
向100ml单口瓶中,加入0.74g吡啶甲酸,1.43g(S)-NOBIN和25ml THF,室温搅拌10min充分溶解后,再加入1.52g脱水剂DMTMM。室温继续搅拌并用TLC跟踪至原料NOBIN基本消失。加入20ml水,搅拌10min分离水层并用乙醚萃取三次,每次20ml,合并有机层,依次用5ml饱和碳酸氢钠溶液,饱和食盐水和5%的稀盐酸溶液洗后,无水硫酸钠干燥。过滤,减压浓缩后的粗产品用25g硅胶柱层析得1.75g酰胺白色固体,收率90%。
在氮气下,390.4mg上述酰胺白色固体和467.2mg(S)-MonoPhos加入到干燥过的50ml Schlenk瓶中,加入15ml甲苯,加热慢慢溶清,回流几个小时后有白色沉淀出现,24h后TLC显示酰胺基本消失,冷却至室温。抽滤并用2ml甲苯洗滤饼两次,真空干燥,得白色固体667.2mg,产率95%。
配体的核磁共振谱数据如下:
1H NMR(400MHz,DMSO-d6):δ9.86(s,1H),8.88-8.92(m,1H),8.30-8.36(m,2H),7.86-8.18(m,9H),7.79(d,J=9.2Hz,1H),7.30-7.47(m,10H),7.00-7.10(m,4H),6.72(d,J=8.8Hz,1H)ppm;31P NMR(162MHz,DMSO-d6):δ144.86ppm;13C NMR(100MHz,DMSO-d6):δ147.9,138.0,131.3,130.7,129.8,129.4,128.5,128.2,127.7,126.9,126.8,126.6,126.4,125.9,125.9,125.4,125.0,124.7,121.2ppm。
经检测,配体(S,S)-Ia的结构式如下:
2制备配体(R,S)-Ib
(R,S)-Ib按照(S,S)-Ia的合成方法。
配体的核磁共振谱数据如下:
1H NMR(400MHz,DMSO-d6):δ9.97(s,1H),8.94(d,J=8.8Hz,1H),7.90-8.37(m,10H),7.75(d,J=8.8Hz,1H),7.25-7.59(m,11H),7.04-7.15(m,4H),6.21(d,J=8.8Hz,1H)ppm;31P NMR(162MHz,DMSO-d6):δ144.83ppm;13C NMR(100MHz,DMSO-d6):δ161.1,148.4,148.0,147.8,146.6,146.0,138.3,134.8,132.8,131.8,131.6,131.4,131.2,131.1,130.9,130.6,129.7,129.5,128.6,128.4,128.3,127.9,127.1,126.8,126.6,125.9,125.8,125.7,125.5,125.2,124.7,121.8,121.7,121.3,121.1,119.9,119.6ppm。
经检测,配体Ib的结构式如下:
3制备配体(S,S)-Ic
(S,S)-Ic按照(S,S)-Ia的合成方法。
配体的核磁共振谱数据如下:
1H NMR(400MHz,DMSO-d6):δ10.20(s,1H),9.13(d,J=8.8Hz,1H),7.75-8.16(m,8H),7.63(d,J=8.4Hz,2H),7.11-7.50(m,14H),6.92(d,J=7.6Hz1H),6.38(d,J=8.4Hz,1H),1.90(s,3H)ppm;31P NMR(162MHz,DMSO-d6):δ146.61ppm;13C NMR(100MHz,DMSO-d6):δ161.9,156.5,148.7,148.5,148.4,147.4,146.9,137.3,135.5,133.8,133.4,132.8,132.2,131.5,131.4,131.2,130.8,130.7,130.2,129.7,128.4,128.3,128.2,127.6,127.0,126.8,126.7,126.3,125.9,125.6,125.1,124.9,124.8,124.3,122.4,121.7,121.6,121.5,121.4,119.9,119.4,118.7,23.7ppm。
经检测,配体的结构式如下:
4催化剂Ir-I的制备
加入0.6717g金属前躯体[Ir(COD)Cl]2及1.690g配体I在2L二氯乙烷中室温搅拌2h原位配位生成催化剂(10-3mol/l)。
实施例2
氢化反应在200ml高压釜中进行。先将反应釜用氮气置换三次,然后往反应釜中注入52g亚胺(由2-甲基-6-乙基苯胺与甲氧基丙酮生成),再注入0.5ml原位配位好的催化剂Ir-Ia(S/C=5×105)。再用氢气置换三次,通氢气加压至50bar,升温至80℃反应3h,降温,泄压,开釜,GC分析反应转化率大于99%,减压蒸馏得50g(S)-NAA,收率95%,HPLC分析ee值为91%。
液相和核磁共振谱数据如下:
HPLC(OJ-H,n-hexane/i-PrOH=98/2,1.0ml/min,254nm,40℃):tR(minor)=3.9min,tR(major)=4.3min.1H NMR(400MHz,CDCl3):7.02(dd,J=7.6,15.2Hz,2H),6.89(t,J=7.6Hz,1H),3.36-3.40(m,6H),2.67(q,J=7.6Hz,2H),2.31(s,3H),1.25(t,J=7.6Hz,3H),δ=1.20(d,J=5.6Hz,3H)ppm。
经推测,产物为(S)-2-乙基-N-(1-甲氧基-2-丙基)-6-甲基苯胺,结构式如下:
实施例3
其它条件与实例2相同,反应催化剂Ir-Ia改成Ir-Ib,GC分析反应转化率大于99%,HPLC分析ee值为85%。
实施例4
其它条件与实例2相同,反应催化剂Ir-Ia改成Ir-Ic,GC分析反应转化率大于99%,HPLC分析ee值为75%。
实施例5
其它条件与实例2相同,反应压力为80bar,GC分析反应转化率大于99%,HPLC分析ee值为90%。
实施例6
其它条件与实例2相同,反应压力为60bar,GC分析反应转化率大于99%,HPLC分析ee值为91%。
实施例7
其它条件与实例2相同,反应温度为100℃,GC分析反应转化率大于99%,HPLC分析ee值88%。
实施例8
其它条件与实例2相同,底物与催化剂的摩尔比例(S/C=106),GC分析反应转化率90%,HPLC分析ee值为89%。
实施例9
其它条件与实例2相同,改成配体Ib,GC分析反应转化率15%,HPLC分析ee值为10%。
实施例10
其它条件与实例2相同,改成配体Ic,GC分析反应转化率99%,HPLC分析ee值为94%。
实施例11
将实施例2中的底物改为2-(2,6-二甲基苯基亚氨基)丙酸甲酯,其余同实施例2,反应得产物2-(2,6-二甲基苯基氨基)丙酸甲酯。96%yield.86%ee。
液相和核磁共振谱数据如下:
HPLC(chiralcel OD-H,n-hexane/i-PrOH=99/1,1.0ml/min,254nm,40℃):tR(minor)=6.9min,tR(major)=7.7min.1H NMR(400MHz,CDCl3):δ=6.97(d,J=7.6Hz,2H),6.81(t,J=7.6Hz,1H),4.00(q,J=7.2Hz,1H),3.68(s,3H),2.31(s,6H),1.38(d,J=7.2Hz,3H)。
经推测,产物为2-(2,6-二甲基苯基氨基)丙酸甲酯,结构式如下:
Claims (8)
1.一种铱/手性亚磷酸酯-吡啶催化亚胺不对称氢化方法,其特征在于:该方法采用手性催化剂Ir-L,亚胺不对称氢化制备手性胺;所述手性催化剂Ir-L由铱-环辛二烯络合物和手性亚磷酸酯-吡啶配体在溶剂中原位配位生成。
2.根据权利要求1所述的一种铱/手性亚磷酸酯-吡啶催化亚胺不对称氢化方法,其特征在于:该方法具体为:
(1)加入铱-环辛二烯络合物及手性亚磷酸酯-吡啶配体,在溶剂中室温搅拌2~5h,原位配位生成手性催化剂Ir-L;
(2)在氮气保护下,加入溶于溶剂的底物亚胺,再加入手性催化剂Ir-L;将其置于高压反应釜中,氢气置换3次,然后通入氢气至20-100bar,20-100℃下反应1-24小时,慢慢释放氢气,除去溶剂后用硅胶柱分离得到产物手性胺。
所述溶剂为二氯甲烷、1,2-二氯乙烷或甲苯;
所述的底物亚胺为:
R1为C1~C10烷基,C3~C12环烷基,或含有N、S、O、P中一种或二种以上官能团的C1~C10烷基,或含有N、S、O、P中一种或二种以上官能团的C3~C10环烷基;或C6-C30内的含或不含N、S、O、P等官能团的芳香基团;或酯基;
R2为H,C1-C40内的烷基或芳基。
3.根据权利要求1或2所述的一种铱/手性亚磷酸酯-吡啶催化亚胺不对称氢化方法,其特征在于;亚胺和制得的手性胺具有以下结构:
式中:
R1为C1~C10烷基;,C3~C12环烷基;,或含有N、S、O、P中一种或二种以上官能团的C1~C10烷基;,或含有N、S、O、P中一种或二种以上官能团的C3~C10环烷基;;或;C6-C30内的含或不含N、S、O、P官能团的芳香基团;或酯基;
R2为H,C1-C40内的烷基或芳基;
Ar为苯基、2-取代、3-取代、4-取代、2,6-二取代、2,4,6-三取代的芳基及其他C6-C30内的含或不含N、S、O、P等官能团的芳香基团。
4.根据权利要求1或2所述的一种铱/手性亚磷酸酯-吡啶催化亚胺不对称氢化方法,其特征在于:所述的手性亚磷酸酯-吡啶配体的结构通式如下:
其中:R为芳香化合物如苯基或C1-C5烷基取代的苯基、烷基、氢或卤素中的一种。
5.根据权利要求1或2所述的一种铱/手性亚磷酸酯-吡啶催化亚胺不对称氢化方法,其特征在于:所述铱-环辛二烯络合物为:[Ir(COD)Cl]2、Ir(COD)2BF4或Ir(COD)2BARF。
6.根据权利要求2所述的一种铱/手性亚磷酸酯-吡啶催化亚胺不对称氢化方法,其特征在于:所述反应体系中所述铱浓度为0.0001-0.01mol/l,所述手性亚磷酸酯-吡啶配体与铱的摩尔比为1-5:1。
7.根据权利要求2所述的一种铱/手性亚磷酸酯-吡啶催化亚胺不对称氢化方法,其特征在于:所述亚胺底物和手性催化剂催化剂Ir-L的摩尔比为100-500000:1。
8.根据权利要求4所述的一种铱/手性亚磷酸酯-吡啶催化亚胺不对称氢化方法,其特征在于:所述的手性亚磷酸酯-吡啶配体的制备方法如下:
(1)向单口瓶中,加入吡啶甲酸,(S)-NOBIN和THF,室温搅拌10~20min充分溶解后,再加入脱水剂DMTMM;室温继续搅拌并用TLC跟踪至原料NOBIN基本消失;吡啶甲酸、(S)-NOBIN与脱水剂DMTMM的摩尔比为:1.2~10:1:1.2~10;加入20ml水,搅拌10min分离水层并用乙醚萃取三次,每次20ml,合并有机层,依次用5ml饱和碳酸氢钠溶液,饱和食盐水和5%的稀盐酸溶液洗后,无水硫酸钠干燥,过滤,减压浓缩后的粗产品用25g硅胶柱层析得酰胺白色固体,
(2)在氮气下,将上述酰胺白色固体和(S)-MonoPhos加入到干燥过的Schlenk瓶中,加入甲苯,加热慢慢溶清,回流几个小时后有白色沉淀出现,所述酰胺白色固体与(S)-MonoPhos摩尔比为:1:1~5;24h后TLC显示酰胺基本消失,冷却至室温;抽滤并用2ml甲苯洗滤饼两次,真空干燥,得白色固体,即手性亚磷酸酯-吡啶配体。
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