CN116135834A - 铱催化不对称氢化α-羰基酸酯制手性α-羟基酸酯的方法 - Google Patents
铱催化不对称氢化α-羰基酸酯制手性α-羟基酸酯的方法 Download PDFInfo
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- -1 alpha-hydroxy acid ester Chemical class 0.000 title claims abstract description 26
- 239000002253 acid Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 20
- 150000002148 esters Chemical class 0.000 title claims abstract description 16
- 229940061720 alpha hydroxy acid Drugs 0.000 title claims abstract description 13
- 238000009876 asymmetric hydrogenation reaction Methods 0.000 title abstract description 12
- 239000003446 ligand Substances 0.000 claims abstract description 40
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 29
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 239000001257 hydrogen Substances 0.000 claims abstract description 17
- 239000000654 additive Substances 0.000 claims abstract description 14
- 230000000996 additive effect Effects 0.000 claims abstract description 14
- 239000002904 solvent Substances 0.000 claims abstract description 12
- 239000000758 substrate Substances 0.000 claims abstract description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 239000003513 alkali Substances 0.000 claims abstract description 7
- 238000005984 hydrogenation reaction Methods 0.000 claims abstract description 7
- 229910052741 iridium Inorganic materials 0.000 claims abstract description 5
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000003054 catalyst Substances 0.000 claims abstract description 4
- 239000000741 silica gel Substances 0.000 claims abstract description 4
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 4
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 28
- 125000001424 substituent group Chemical group 0.000 claims description 28
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 17
- 125000000217 alkyl group Chemical group 0.000 claims description 17
- 239000000460 chlorine Substances 0.000 claims description 17
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 claims description 14
- 239000002585 base Substances 0.000 claims description 11
- LPNYRYFBWFDTMA-UHFFFAOYSA-N potassium tert-butoxide Chemical group [K+].CC(C)(C)[O-] LPNYRYFBWFDTMA-UHFFFAOYSA-N 0.000 claims description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 7
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 6
- 125000001624 naphthyl group Chemical group 0.000 claims description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 5
- 150000002431 hydrogen Chemical class 0.000 claims description 5
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 4
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 4
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 4
- 125000003545 alkoxy group Chemical group 0.000 claims description 4
- 125000006615 aromatic heterocyclic group Chemical group 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052794 bromium Inorganic materials 0.000 claims description 4
- 229910052801 chlorine Inorganic materials 0.000 claims description 4
- 125000004122 cyclic group Chemical group 0.000 claims description 4
- 239000011737 fluorine Substances 0.000 claims description 4
- 229910052731 fluorine Inorganic materials 0.000 claims description 4
- 229910052736 halogen Inorganic materials 0.000 claims description 4
- 150000002367 halogens Chemical class 0.000 claims description 4
- 239000011630 iodine Substances 0.000 claims description 4
- 229910052740 iodine Inorganic materials 0.000 claims description 4
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 claims description 4
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims description 4
- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- 239000003480 eluent Substances 0.000 claims description 3
- 239000003208 petroleum Substances 0.000 claims description 3
- SCYULBFZEHDVBN-UHFFFAOYSA-N 1,1-Dichloroethane Chemical compound CC(Cl)Cl SCYULBFZEHDVBN-UHFFFAOYSA-N 0.000 claims description 2
- BXVSAYBZSGIURM-UHFFFAOYSA-N 2-phenoxy-4h-1,3,2$l^{5}-benzodioxaphosphinine 2-oxide Chemical compound O1CC2=CC=CC=C2OP1(=O)OC1=CC=CC=C1 BXVSAYBZSGIURM-UHFFFAOYSA-N 0.000 claims description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 2
- 125000002252 acyl group Chemical group 0.000 claims description 2
- 239000012298 atmosphere Substances 0.000 claims description 2
- 238000006555 catalytic reaction Methods 0.000 claims description 2
- 238000004440 column chromatography Methods 0.000 claims description 2
- 125000004093 cyano group Chemical group *C#N 0.000 claims description 2
- 125000004185 ester group Chemical group 0.000 claims description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 2
- 239000012467 final product Substances 0.000 claims description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 2
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 2
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 239000000376 reactant Substances 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- MFRIHAYPQRLWNB-UHFFFAOYSA-N sodium tert-butoxide Chemical compound [Na+].CC(C)(C)[O-] MFRIHAYPQRLWNB-UHFFFAOYSA-N 0.000 claims description 2
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 claims description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 2
- 239000008096 xylene Substances 0.000 claims description 2
- UFJSITOHZAUZBO-UHFFFAOYSA-K cycloocta-1,3-diene;trichloroiridium Chemical class Cl[Ir](Cl)Cl.C1CCC=CC=CC1 UFJSITOHZAUZBO-UHFFFAOYSA-K 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 6
- BXMJNGVLZAWGJH-UHFFFAOYSA-N [Ir].C1CCC=CC=CC1 Chemical compound [Ir].C1CCC=CC=CC1 BXMJNGVLZAWGJH-UHFFFAOYSA-N 0.000 abstract description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 23
- SAXHIDRUJXPDOD-UHFFFAOYSA-N ethyl hydroxy(phenyl)acetate Chemical compound CCOC(=O)C(O)C1=CC=CC=C1 SAXHIDRUJXPDOD-UHFFFAOYSA-N 0.000 description 14
- 150000001875 compounds Chemical class 0.000 description 5
- 238000005481 NMR spectroscopy Methods 0.000 description 4
- 239000007810 chemical reaction solvent Substances 0.000 description 4
- 229940079593 drug Drugs 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 238000004128 high performance liquid chromatography Methods 0.000 description 3
- 150000002576 ketones Chemical class 0.000 description 3
- MTZQAGJQAFMTAQ-UHFFFAOYSA-N ethyl benzoate Chemical compound CCOC(=O)C1=CC=CC=C1 MTZQAGJQAFMTAQ-UHFFFAOYSA-N 0.000 description 2
- 239000000543 intermediate Substances 0.000 description 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 125000000008 (C1-C10) alkyl group Chemical group 0.000 description 1
- 125000006552 (C3-C8) cycloalkyl group Chemical group 0.000 description 1
- HTSGKJQDMSTCGS-UHFFFAOYSA-N 1,4-bis(4-chlorophenyl)-2-(4-methylphenyl)sulfonylbutane-1,4-dione Chemical compound C1=CC(C)=CC=C1S(=O)(=O)C(C(=O)C=1C=CC(Cl)=CC=1)CC(=O)C1=CC=C(Cl)C=C1 HTSGKJQDMSTCGS-UHFFFAOYSA-N 0.000 description 1
- ZTVIKZXZYLEVOL-MCOXGKPRSA-N Homatropine Chemical compound O([C@H]1C[C@H]2CC[C@@H](C1)N2C)C(=O)C(O)C1=CC=CC=C1 ZTVIKZXZYLEVOL-MCOXGKPRSA-N 0.000 description 1
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 1
- ITATYELQCJRCCK-UHFFFAOYSA-N Mandelic Acid, Methyl Ester Chemical compound COC(=O)C(O)C1=CC=CC=C1 ITATYELQCJRCCK-UHFFFAOYSA-N 0.000 description 1
- YZCKVEUIGOORGS-NJFSPNSNSA-N Tritium Chemical group [3H] YZCKVEUIGOORGS-NJFSPNSNSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 238000011914 asymmetric synthesis Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000009903 catalytic hydrogenation reaction Methods 0.000 description 1
- 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
- 229960000857 homatropine Drugs 0.000 description 1
- 150000002466 imines Chemical class 0.000 description 1
- IWYDHOAUDWTVEP-UHFFFAOYSA-M mandelate Chemical compound [O-]C(=O)C(O)C1=CC=CC=C1 IWYDHOAUDWTVEP-UHFFFAOYSA-M 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
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Abstract
本发明提供一种铱催化不对称氢化α‑羰基酸酯制备手性α‑羟基酸酯的方法,该手性α‑羟基酸酯化合物的制备方法为:在充满氮气的手套箱内,将环辛二烯氯化铱二聚体([Ir(COD)Cl]2)与手性P,N,N配体溶于无水醇类溶剂中,室温下搅拌1小时,生成铱催化剂。加入底物α‑羰基酸酯和碱添加剂,将其置于高压反应釜中,于一定的反应压力下氢化反应。慢慢释放氢气,除去溶剂后用硅胶柱分离得到产物手性α‑羟基酸酯。本发明所述的铱催化α‑羰基酸酯的不对称氢化制备手性α‑羟基酸酯的反应具有条件温和、易于操作,且产物的对映选择性高等优点。
Description
技术领域
本发明属于有机合成领域,具体涉及一种铱催化不对称氢化制备手性α-羟基酸酯的方法。
背景技术
在过去的几十年里,过渡金属催化的不对称合成得到了极大发展。其中,不饱和烯烃、酮和亚胺的不对称催化氢化,是最为直接、最为有效的制备手性化合物的方法。通过酮的不对称氢化,可以获得手性药物和天然产物的重要骨架—手性醇[a)R.Noyori andT.Ohkuma,Angew.Chem.Int.Ed.,2001,40,40-73;(b)R.Noyori,Adv.Synth.Catal.,2003,345,15-32.)。和简单酮的氢化相比,由于手性扁桃酸酯类化物是许多药物分子的中间体,不对称氢化合成其相关化合物近些年也出现了许多报道。2006年,Albert S.C.Chan等和Xumu Zhang分别合成一类新的C3-TunePhos在α-羰基酸酯的不对称氢化中取得了突破性的进展。[a)L.Qiu,F.Y.Kwong,J.Wu,W.H.Lam,S.Chan,W.-Y.Yu,Y.-M..Li,R.Guo,Z.Zhou,Albert S.C.Chan.J.Am.Chem.Soc.,2006,128,5955;b)C.-J.Wang,X.Sun,X.Zhang,Synlett,2006,8,1169]。2019年,周其林等发展了铱-P,N,N配体(SpiroOAP)催化剂,该催化剂在α-羰基酰胺的不对称氢化中获得了优秀的对映选择性和高达10000的转化数(F.-H.Zhang,C.Wang,J.-H.Xie,Q.-L.Zhou,Adv.Synth.Catal.2019,361,2832)。近来,我们发展的二茂铁P,N,N配体在铱催化β-酮酸酯不对称氢化中有着优异的表现[a)C.-J.Hou andX.-P.Hu,Org.Lett.,2016,18,5592-5595;b)X.-S.Chen,C.-J.Hou,C.Qin,H.Liu,Y.-J.Liu,D.-Z.Huang and X.-P.Hu,RSC.Adv.,2017,7,12871-12875]。
发明内容
本发明的目的是提供一种铱催化不对称氢化α-羰基酸酯制备手性α-羟基酸酯的方法。
一种铱催化不对称氢化α-羰基酸酯制备手性α-羟基酸酯的方法;该方法以α-羰基酸酯化合物为原料,环辛二烯氯化铱二聚体([Ir(COD)Cl]2)/手性P,N,N配体为催化剂,制备手性α-羟基酸酯化合物,
所述的反应方程式如下:
所述的酮化合物I,醇化合物II,结构如下式:
其中,R1为C1-C40的链状烷基,环上碳数为C3-C12的环烷基或带有取代基的环状碳数为C3-C12环烷基,苯基及取代苯基,苄基及取代苄基,含一个或二个以上氧、硫、氮原子中的一种或二种以上的五元或六元杂环芳香基团;
所述环上碳数为C3-C12环烷基上的取代基、苯基上的取代基、苄基上的取代基分别为C1-C40链烷基烷基、C1-C40的烷氧基、卤素(氟、氯、溴、碘)、硝基、酯基或氰基中的一种或二种以上;取代基个数为1-2个。
R2为甲基、乙基、异丙基、叔丁基或苯基。
所述的手性P,N,N配体,其结构如下式:
式中:
R3,R4分别为C1~C10的链状烷基、环上碳数为C3~C8的环烷基、苯基、取代苯基、苄基或取代苄基,取代苯基上的取代基选自C1~C10内的链状烷基,取代苄基上的取代基选自C1~C10内的烷基;取代基个数为1-2个。
R5,R6分别为氢、卤素(氟、氯、溴、碘)、C1~C10内的链状烷基、环状碳数为C3~C8内的环烷基、苯基、取代苯基、C1~C10内的链状烷氧基、苯氧基、酰基或硝基,取代苯基上的取代基选自C1~C10内的链状烷基;取代基个数为1-2个。
R7为C1~C10内的链状烷基、环上碳数为C3~C8内的环烷基、苯基、取代苯基、萘基、取代萘基或含一个或两个以上氧、硫、氮原子中的一种或二种以上的五元或六元杂环芳香基团,取代苯基或取代萘基上的取代基分别选自C1~C10内的链状烷基,取代基个数为1-2个。
该方法的具体步骤为:在氮气环境中,将[Ir(COD)Cl]2和手性P,N,N配体溶于无水醇溶剂,室温下搅拌0.5-2小时;加入底物α-羰基酸酯类化合物和碱添加剂,将其置于高压反应釜中,氢气置换反应釜内气氛,然后通入氢气,室温反应;释放氢气,除去溶剂后用硅胶柱分离得到产物,以上反应物按摩尔比[Ir(COD)Cl]2:手性P,N,N配体:α-羰基酸酯:碱添加剂=1:2~4:100~10000:5~1000,优选[Ir(COD)Cl]2:手性P,N,N配体:α-羰基酸酯:碱添加剂=1:2~3:100~5000:5~500,更优选[Ir(COD)Cl]2:手性P,N,N配体:α-羰基酸酯:碱添加剂=1:2~2.5:100~3000:5~200。
所述碱添加剂为t-BuOK、t-BuONa、KOH、NaOH、K2CO3、NaCO3、Et3N、i-Pr2NEt或DBU中的一种或二种以上;优选为t-BuOK。
所述的溶剂为甲醇、乙醇、甲苯、苯、二甲苯、二氯甲烷、二氯乙烷、四氢呋喃或乙酸乙酯中的一种或两种以上;所述的溶剂优选为乙醇。
所述氢化反应压力为10-80大气压,氢化反应时间为12-36小时。
所述柱层析洗脱剂参数为体积比石油醚:乙酸乙酯=10:1~50:1。
本发明的有益效果和优势:
本发明所述的铱催化α-羰基酸酯的不对称氢化反应制备手性α-羟基酸酯化合物具有条件温和、易于操作,且产物的对映选择性高等优点。
附图说明
图1是化合物2-羟基-2-苯基乙酸乙酯II-a的核磁氢谱图。
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Agilent 1100系列高效液相色谱测定。
实施例1
在充满氮气的手套箱中,将[Ir(COD)Cl]2(0.34mg,0.0005mmol)和手性P,N,N配体L1(0.64mg,0.0011mmol)溶于无水乙醇(2.0mL),室温下搅拌1小时。加入底物苯甲酰甲酸乙酯I-a(120mg,1.0mmol)和t-BuOK(5.6mg,0.05mmol),将其置于高压反应釜中,氢气置换3次,然后通入氢气至20个大气压,室温下反应24小时。慢慢释放氢气,除去溶剂后用硅胶柱分离得到产物2-羟基-2-苯基乙酸乙酯II-a。洗脱剂为体积比石油醚:乙酸乙酯=10:1。98%收率,80%ee。1H NMR(400MHz,CDCl3)δ7.42(d,J=6.9Hz,2H),7.33(dt,J=17.3,6.9Hz,3H),5.15(s,1H),4.36–3.99(m,2H),1.34–1.08(m,3H)..HPLC(chiralcel OD-H,n-hexane/i-PrOH=90/10,1mL/min,210nm,40℃):tR(major)=5.9min,tR(minor)=8.6min.化合物II-a的核磁氢谱如图1所示。
该类化合物是许多药物分子重要的中间体如Cylandelate、Homatropine,参考文献(R.G.Glushkov,N.I.Koretskaya,K.I.Dombrovskaya,G.Y.Shvarts andM.D.Mashkovskii,Pharm.Chem.J.1977,11,905-909)。
化合物L1、I-a和II-a的结构分别如下:
实施例2
与实施例1不同之处在于,将配体L1替换为L2,其余同实施例1,得产物2-羟基-2-苯基乙酸乙酯II-a,98%收率,94%ee。
配体L2的结构如下:
实施例3
与实施例1不同之处在于,将配体L1替换为L3,其余同实施例1,得产物2-羟基-2-苯基乙酸乙酯II-a,96%收率,86%ee。
配体L3的结构如下:
实施例4
与实施例1不同之处在于,将配体L1替换为L4,其余同实施例1,得产物2-羟基-2-苯基乙酸乙酯II-a,96%收率,84%ee。
配体L4的结构如下:
实施例5
与实施例1不同之处在于,将配体L1替换为L5,其余同实施例1,得产物2-羟基-2-苯基乙酸乙酯II-a,96%收率,75%ee。
配体L5的结构如下:
实施例6
与实施例1不同之处在于,将配体L1替换为L6,其余同实施例1,得产物2-羟基-2-苯基乙酸乙酯II-a,96%收率,82%ee。
配体L6的结构如下:
实施例7
与实施例1不同之处在于,将配体L1替换为L7,其余同实施例1,得产物2-羟基-2-苯基乙酸乙酯II-a,98%收率,83%ee。
配体L7的结构如下:
实施例8
与实施例1不同之处在于,将配体L1替换为L8,其余同实施例1,得产物2-羟基-2-苯基乙酸乙酯II-a,98%收率,70%ee。
配体L8的结构如下:
实施例9
与实施例1不同之处在于,将配体L1替换为L9,其余同实施例1,得产物2-羟基-2-苯基乙酸乙酯II-a,96%收率,82%ee。
配体L9的结构如下:
实施例10
与实施例1不同之处在于,将配体L1替换为L10,其余同实施例1,得产物2-羟基-2-苯基乙酸乙酯II-a,98%收率,90%ee。
配体L10的结构如下:
实施例11
与实施例1不同之处在于,将配体L1替换为L11,其余同实施例1,得产物2-羟基-2-苯基乙酸乙酯II-a,95%收率,83%ee。
配体L11的结构如下:
实施例12
与实施例1不同之处在于,将配体L1替换为L12,其余同实施例1,得产物2-羟基-2-苯基乙酸乙酯II-a,95%收率,81%ee。
配体L12的结构如下:
实施例13
与实施例2不同之处在于,将氢气压力改为50大气压,其余同实施例2,得产物2-羟基-2-苯基乙酸乙酯II-a,98%收率,94%ee。
实施例14
与实施例2不同之处在于,将氢气压力改为80大气压,其余同实施例2,得产物2-羟基-2-苯基乙酸乙酯II-a,98%收率,94%ee。
实施例15
与实施例2不同之处在于,将碱t-BuOK替换为t-BuONa,其余同实施例2,得产物2-羟基-2-苯基乙酸乙酯II-a,96%收率,92%ee。
实施例16
与实施例2不同之处在于,将碱t-BuOK替换为KOH,其余同实施例2,得产物2-羟基-2-苯基乙酸乙酯II-a,96%收率,84%ee。
实施例17
与实施例2不同之处在于,将碱t-BuOK替换为NaOH,其余同实施例2,得产物2-羟基-2-苯基乙酸乙酯II-a,96%收率,85%ee。
实施例18
与实施例2不同之处在于,将碱t-BuOK替换为K2CO3,其余同实施例2,得产物2-羟基-2-苯基乙酸乙酯II-a,96%收率,84%ee。
实施例19
与实施例2不同之处在于,将反应溶剂EtOH替换为MeOH,其余同实施例2,得产物2-羟基-2-苯基乙酸甲酯II-a,95%收率,82%ee。
实施例20
与实施例2不同之处在于,将反应溶剂EtOH替换为i-PrOH,其余同实施例2,得产物2-羟基-2-苯基乙酸乙酯II-a,95%收率,75%ee。
实施例21
与实施例2不同之处在于,将反应溶剂EtOH替换为Toluene,其余同实施例2,得产物2-羟基-2-苯基乙酸乙酯II-a,35%收率,38%ee。
实施例22
与实施例2不同之处在于,将反应溶剂EtOH替换为CH2Cl2,其余同实施例2,得产物2-羟基-2-苯基乙酸乙酯II-a,20%收率,35%ee。
实施例23-43
反应底物适用性
在充满氮气的手套箱中,将[Ir(COD)Cl]2(0.34mg,0.0005mmol)和手性P,N,N配体L2(0.64mg,0.0011mmol)溶于无水乙醇(2.0mL),室温下搅拌1小时。依次加入底物I-b~I-v、(120mg,1.0mmol)和叔丁醇钾(5.6mg,0.05mmol),将其置于高压反应釜中,氢气置换3次,然后通入氢气至20个大气压,室温下反应24小时,得氢化产物II-b~II-v。
本发明具有广泛的底物适用性,按照上述反应条件,许多底物都能参与该反应,高收率和高对映选择性的获得手性中心的醇产物II,其反应式为:
Claims (9)
1.铱催化不对称氢化α-羰基酸酯制手性α-羟基酸酯的方法,其特征在于:该方法以α-羰基酸酯化合物为原料,环辛二烯氯化铱二聚体([Ir(COD)Cl]2)/手性P,N,N配体为催化剂,制备手性α-羟基酸酯化合物。
4.根据权利要求1所述的方法,其特征在于:所述的手性P,N,N配体,其结构如下式:
式中:
R3,R4分别为C1~C10的链状烷基、环上碳数为C3~C8的环烷基、苯基、取代苯基、苄基或取代苄基;取代苯基上的取代基选自C1~C10内的链状烷基,取代苄基上的取代基选自C1~C10内的烷基,取代基个数为1-2个;
R5,R6分别为氢、卤素(氟、氯、溴、碘)、C1~C10内的链状烷基、环状碳数为C3~C8内的环烷基、苯基、取代苯基、C1~C10内的链状烷氧基、苯氧基、酰基或硝基;取代苯基上的取代基选自C1~C10内的链状烷基,取代基个数为1-2个;
R7为C1~C10内的链状烷基、环上碳数为C3~C8内的环烷基、苯基、取代苯基、萘基、取代萘基或含一个或两个以上氧、硫、氮原子中的一种或二种以上的五元或六元杂环芳香基团;取代苯基或取代萘基上的取代基分别选自C1~C10内的链状烷基,取代基个数为1-2个。
5.根据权利要求1所述的方法,其特征在于:该方法的具体步骤为:
在氮气环境中,将[Ir(COD)Cl]2和手性P,N,N配体溶于无水醇溶剂,室温下搅拌0.5-2小时;加入底物α-羰基酸酯类化合物和碱添加剂,将其置于高压反应釜中,氢气置换反应釜内气氛,然后通入氢气,室温反应;释放氢气,除去溶剂后用硅胶柱分离得到产物,以上反应物按摩尔比[Ir(COD)Cl]2:手性P,N,N配体:α-羰基酸酯:碱添加剂=1:2~4:100~10000:5~1000,优选[Ir(COD)Cl]2:手性P,N,N配体:α-羰基酸酯:碱添加剂=1:2~3:100~5000:5~500,更优选[Ir(COD)Cl]2:手性P,N,N配体:α-羰基酸酯:碱添加剂=1:2~2.5:100~3000:5~200。
6.根据权利要求5所述的方法,其特征在于:所述碱添加剂为t-BuOK、t-BuONa、KOH、NaOH、K2CO3、NaCO3、Et3N、i-Pr2NEt或DBU中的一种或二种以上;
所述的溶剂为甲醇、乙醇、甲苯、苯、二甲苯、二氯甲烷、二氯乙烷、四氢呋喃或乙酸乙酯中的一种或两种以上;
所述氢化反应压力为10-80大气压,氢化反应时间为12-36小时。
7.根据权利要求5或6所述的方法,其特征在于:所述碱添加剂优选为t-BuOK;所述的溶剂优选为乙醇。
8.根据权利要求5所述的方法,其特征在于:所述柱层析洗脱剂参数为体积比石油醚:乙酸乙酯=10:1~50:1。
9.根据权利要求5所述的方法,其特征在于:底物α-羰基酸酯类化合物于溶剂中的浓度范围为0.5mol/l-1mol/l。
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