CN112442060A - 一种铜催化合成γ-氨基硼酸酯的方法 - Google Patents
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- 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
- C07F5/04—Esters of boric acids
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Abstract
本发明提供一种铜催化合成γ‑氨基硼酸酯的方法,使用烯烃或炔烃为反应原料,双(频哪醇合)二硼(B2pin2)为硼源,N,O‑缩醛胺为胺甲基化试剂,铜盐和膦配体为催化剂,利用N,O‑缩醛胺分解成的亚甲基亚胺正离子和甲氧基负离子,成功激活双(频哪醇合)二硼,并捕获中间体有机铜试剂,制备了γ‑氨基硼酸酯类化合物。该方法不使用强碱,反应条件温和,简便易行,收率高,原料稳定且易于获得。本发明中的γ‑氨基硼酸酯是合成药物和天然产物等复杂分子的重要中间体。
Description
技术领域
本发明涉及一种铜催化合成γ-氨基硼酸酯的方法,属于有机合成领域。
背景技术
铜催化碳碳不饱和键的硼碳化反应是制备有机硼化合物的重要方法,反应通常以来源广泛、结构多变、性质稳定的烯烃或炔烃为起始原料,使用双(频哪醇合)二硼(B2pin2)作为硼源,铜盐作为催化剂,亲电试剂捕获中间体有机铜试剂,制得官能团化的有机硼酸酯类化合物(S.L.Buchwald,Angew.Chem.Int.Ed.,2014,53,8677;M.K.Brown,Angew.Chem.Int.Ed.,2017,56,13314;H.Ito,Angew.Chem.Int.Ed.,2018,57,7196;M.Lautens,Angew.Chem.Int.Ed.,2018,130,14123;D.J.Procter,Angew.Chem.Int.Ed.,2020,59,4879)。
N,O-缩醛胺是一类重要的胺甲基化试剂,近年来,合成化学家们利用N,O-缩醛胺成功构建了β2-氨基酸(氨基酸的α位有取代基)。β2-氨基酸在天然产物和药物化学中有极高的价值,常规方法难以制得。早期,Gellman使用脯氨酸催化醛的曼尼希反应,N,O-缩醛胺做胺甲基化试剂,成功制备了β2-氨基酸(S.H.Gellman,J.Am.Chem.Soc.,2006,128,6804)。Chi使用组合催化剂(氮杂卡宾和酸),以α,β-不饱和醛为原料合成了β2-氨基酸(Y.Chi,Angew.Chem.Int.Ed.,2015,54,5161)。近期,Xu、Huang和Sun等研究组使用过渡金属催化剂,以重氮衍生物为原料,制备了α-烷氧基-β2-氨基酸酯(X.Xu,J.Am.Chem.Soc.,2019,141,1473;H.Huang,Chem.Commun.,2019,55,3947;J.Sun,Org.Lett.,2019,21,1664)。
N,O-缩醛胺能够原位生成高活性亚甲基亚胺正离子和烷氧负离子,亚胺正离子是一个很好的正电性捕获试剂,同时,烷氧负离子可活化B2pin2(双(频哪醇合)二硼),经铜催化碳碳不饱和键的硼碳化反应,能够构建γ-氨基硼酸酯结构。γ-氨基硼酸酯中的氨基和硼酸酯能够衍生化形成多种化学键,如γ-氨基醇(C.Tao,Chem.Commun.,2020,56,7483),β-氨基醛和β-氨基酸等(A.Córdova,Chem.Eur.J.,2007,13,683),从而使其在药物和天然产物等复杂分子的合成中有重要意义。
本发明使用烯烃或炔烃为反应原料,双(频哪醇合)二硼(B2pin2)为硼源,N,O-缩醛胺为胺甲基化试剂,铜盐和膦配体为催化剂,利用N,O-缩醛胺分解成的亚甲基亚胺正离子和甲氧基负离子,成功激活双(频哪醇合)二硼,并捕获中间体有机铜试剂,制备了γ-氨基硼酸酯类化合物。该方法不使用强碱,反应条件温和,简便易行,收率高,原料稳定且易于获得。
发明内容
本发明的目的是提供一种铜催化合成γ-氨基硼酸酯的方法:使用烯烃或炔烃为反应原料,双(频哪醇合)二硼(B2pin2)为硼源,N,O-缩醛胺为胺甲基化试剂,铜盐和膦配体为催化剂,利用N,O-缩醛胺分解成的亚甲基亚胺正离子和甲氧基负离子,成功激活双(频哪醇合)二硼,并捕获中间体有机铜试剂,合成了γ-氨基硼酸酯类化合物。
为达到上述发明目的,本发明提出一种铜催化合成γ-氨基硼酸酯的方法,其合成路径如下所示:
本发明提供的一种铜催化合成γ-氨基硼酸酯的方法,其步骤如下:
向干燥的Schlenk反应管中加入铜盐、膦配体和通式2所示双(频哪醇合)二硼,使用Schlenk双排管抽真空,通入氩气,反复三次,在通入氩气状态下,加入溶剂、通式1所示烯烃或炔烃、通式3所示N,O-缩醛胺,密封反应体系,控制反应体系温度20~30℃,搅拌反应36~48小时后,加入氨水和乙酸乙酯,搅拌30分钟,萃取分液,分离出的有机相用无水硫酸镁干燥,除去硫酸镁,所得有机相浓缩,浓缩液用硅胶柱色谱分离,制得通式4所示γ-氨基硼酸酯;
其中通式1和通式4中的R1、R2选自H、芳基、烷基的一种。
所述方法的步骤中,铜盐是Cu(CH3CN)4PF6,Cu(CH3CN)4BF4,Cu(OAc)2,Cu(OTf)2。
所述方法的步骤中,膦配体是2-(二环己基膦基)联苯(CyJohnPhos),三苯基膦(PPh3),2-双环己基膦-2′,6′-二甲氧基联苯(SPhos),2-二环己基膦-2,4,6-三异丙基联苯(XPhos),2,2′-双(二苯基膦)-1,1′-联萘(BINAP)。
所述方法的步骤中,溶剂是甲苯,二氯甲烷,四氢呋喃,1,4-二氧六环。
所述方法的步骤中,烯烃或炔烃1∶双(频哪醇合)二硼2∶N,O-缩醛胺3∶铜盐∶膦配体的用量摩尔比例为1.0∶1.5~3.0∶1.5~3.0∶0.1~0.2∶0.2~0.4。
具体实施方式
通过下述实施例子将有助于理解本发明,但并非限制本发明的内容。
实施例1:制备2-苯基-3-(N,N-二苄基氨基)-1-丙基硼酸频哪醇酯
向干燥的Schlenk反应管中加入76.5mg(0.3mmol)双(频哪醇合)二硼、9.5mg(0.03mmol)Cu(CH3CN)4BF4铜盐和21.0mg(0.06mmol)2-(二环己基膦基)联苯(CyJohnPhos)配体,使用Schlenk双排管抽真空,通入氩气,反复三次,在通入氩气状态下,加入1.0mL二氯甲烷、72.5mg(0.3mmol)N,O-缩醛胺和24uL(0.2mmol)苯乙烯,密封反应体系,控制反应体系温度20~25℃,搅拌反应36小时后,加入0.5mL氨水和15mL乙酸乙酯,搅拌30分钟,萃取分液,分离出的有机相用无水硫酸镁干燥,除去硫酸镁,所得有机相浓缩,浓缩液用硅胶柱色谱分离,制得2-苯基-3-(N,N-二苄基氨基)-1-丙基硼酸频哪醇酯,收率65%;1H NMR(500MHz,CDCl3)δ=7.23-7.20(m,7H),7.18-7.16(m,6H),7.08(d,J=7.1Hz,2H),3.59(d,J=13.8Hz,2H),3.47(d,J=13.8Hz,2H),3.20-3.15(m,1H),2.57(dd,J=12.6,8.2Hz,1H),2.49(dd,J=12.6,7.0Hz,1H),1.31(dd,J=15.6,6.4Hz,1H),1.05(s,6H),1.04(s,6H),0.96(dd,J=15.7,9.5Hz,1H);13C NMR(126MHz,CDCl3)δ=145.87,139.74,128.83,128.06,128.00,127.92,126.63,125.92,82.94,62.09,58.44,39.72,24.72,24.65,17.05;11B NMR(128MHz,CDCl3)δ=33.49;HRMS(ESI)m/z:calculated for[C29H36BNO2+H]+442.2917,found442.2916。
实施例2:制备2-(4-氯苯基)-3-(N,N-二苄基氨基)-1-丙基硼酸频哪醇酯
向干燥的Schlenk反应管中加入102.0mg(0.4mmol)双(频哪醇合)二硼、15.0mg(0.04mmol)Cu(CH3CN)4PF6铜盐和21.0mg(0.08mmol)三苯基膦(PPh3)配体,使用Schlenk双排管抽真空,通入氩气,反复三次,在通入氩气状态下,加入1.0mL 1,4-二氧六环、145.0mg(0.6mmol)N,O-缩醛胺和24uL(0.2mmol)对氯苯乙烯,密封反应体系,控制反应体系温度25~30℃,搅拌反应36小时后,加入0.5mL氨水和15mL乙酸乙酯,搅拌30分钟,萃取分液,分离出的有机相用无水硫酸镁干燥,除去硫酸镁,所得有机相浓缩,浓缩液用硅胶柱色谱分离,制得2-(4-氯苯基)-3-(N,N-二苄基氨基)-1-丙基硼酸频哪醇酯,收率45%;1H NMR(500MHz,CDCl3)δ=7.22-7.12(m,12H),6.96(d,J=8.4Hz,2H),3.64(d,J=13.7Hz,2H),3.37(d,J=13.7Hz,2H),3.21-3.07(m,1H),2.55(dd,J=12.6,9.0Hz,1H),2.45(dd,J=12.7,6.2Hz,1H),1.25-1.18(m,1H),1.07(s,6H),1.05(s,6H),0.91(dd,J=15.6,9.5Hz,1H);13C NMR(126MHz,CDCl3)δ=144.56,139.58,131.41,129.38,128.82,128.12,127.95,126.76,83.08,61.94,58.57,39.23,24.78,24.72,17.14;11B NMR(128MHz,CDCl3)δ=32.07;HRMS(ESI)m/z:calculated for[C29H35BClNO2+H]+476.2522,found 476.2508。
实施例3:制备2-(3-氯苯基)-3-(N,N-二苄基氨基)-1-丙基硼酸频哪醇酯
向干燥的Schlenk反应管中加入153mg(0.6mmol)双(频哪醇合)二硼、8.0mg(0.04mmol)Cu(OAc)2铜盐和25.0mg(0.04mmol)2,2′-双(二苯基膦)-1,1′-联萘(BINAP)配体,使用Schlenk双排管抽真空,通入氩气,反复三次,在通入氩气状态下,加入1.0mL四氢呋喃、97.0mg(0.4mmol)N,O-缩醛胺和26uL(0.2mmol)间氯苯乙烯,密封反应体系,控制反应体系温度20~25℃,搅拌反应36小时后,加入0.5mL氨水和15mL乙酸乙酯,搅拌30分钟,萃取分液,分离出的有机相用无水硫酸镁干燥,除去硫酸镁,所得有机相浓缩,浓缩液用硅胶柱色谱分离,制得2-(3-氯苯基)-3-(N,N-二苄基氨基)-1-丙基硼酸频哪醇酯,收率55%;1H NMR(500MHz,CDCl3)δ=δ7.24-7.12(m,12H),7.04(s,1H),6.93(d,J=6.7Hz,1H),3.66(d,J=13.7Hz,2H),3.38(d,J=13.7Hz,2H),3.29-3.013(m,1H),2.58(dd,J=12.5,9.1Hz,1H),2.47(dd,J=12.7,6.2Hz,1H),1.25-1.20(m,1H),1.08(s,1H),1.07(s,1H),0.92(dd,J=15.6,9.5Hz,1H);13C NMR(126MHz,CDCl3)δ=δ148.05,139.50,133.60,129.09,128.75,128.23,128.09,126.72,126.20,125.98,83.06,61.56,58.49,39.53,24.71,24.64,17.10;11B NMR(128MHz,CDCl3)δ=32.92;HRMS(ESI)m/z:calculated for[C29H35BClNO2+H]+476.2522,found 476.2507。
实施例4:制备2-(2-氯苯基)-3-(N,N-二苄基氨基)-1-丙基硼酸频哪醇酯
向干燥的Schlenk反应管中加入76.5mg(0.3mmol)双(频哪醇合)二硼、11.0mg(0.03mmol)Cu(OTf)2铜盐和28.5mg(0.06mmol)2-二环己基膦-2,4,6-三异丙基联苯(XPhos)配体,使用Schlenk双排管抽真空,通入氩气,反复三次,在通入氩气状态下,加入1.0mL甲苯、72.5mg(0.3mmol)N,O-缩醛胺和26uL(0.2mmol)邻氯苯乙烯,密封反应体系,控制反应体系温度25~30℃,搅拌反应36小时后,加入0.5mL氨水和15mL乙酸乙酯,搅拌30分钟,萃取分液,分离出的有机相用无水硫酸镁干燥,除去硫酸镁,所得有机相浓缩,浓缩液用硅胶柱色谱分离,制得2-(2-氯苯基)-3-(N,N-二苄基氨基)-1-丙基硼酸频哪醇酯,收率55%;1H NMR(500MHz,CDCl3)δ=7.32-7.31(m,1H),7.25-7.15(m,10H),7.10-7.04(m,2H),6.96-6.90(m,1H),3.91-3.77(m,1H),3.59(d,J=13.7Hz,2H),3.51(d,J=13.7Hz,2H),,2.61(dd,J=12.4,7.9Hz,1H),2.45(dd,J=12.6,7.2Hz,1H),1.36(dd,J=15.5,6.0Hz,1H),1.06(s,6H),1.02(s,6H),0.96(dd,J=15.4,10.0Hz,1H);13C NMR(126MHz,CDCl3)δ=δ143.13,139.69,134.20,129.05,128.92,128.52,128.01,126.84,126.62,82.97,61.18,58.50,35.07,24.65,24.52,16.31;11B NMR(128MHz,CDCl3)δ=33.52;HRMS(ESI)m/z:calculated for[C29H35BClNO2+H]+476.2522,found 476.2506。
实施例5:制备3-(N,N-二苄基氨基)甲基二环[2.2.1]庚基-2-硼酸频哪醇酯
向干燥的Schlenk反应管中加入19mg(0.2mmol)降冰片烯、102.0mg(0.4mmol)双(频哪醇合)二硼、11.5mg(0.03mmol)Cu(CH3CN)4PF6铜盐和25.0mg(0.06mmol)2-双环己基膦-2′,6′-二甲氧基联苯(SPhos)配体,使用Schlenk双排管抽真空,通入氩气,反复三次,在通入氩气状态下,加入1.0mL甲苯和97.0mg(0.4mmol)N,O-缩醛胺,密封反应体系,控制反应体系温度25~30℃,搅拌反应36小时后,加入0.5mL氨水和15mL乙酸乙酯,搅拌30分钟,萃取分液,分离出的有机相用无水硫酸镁干燥,除去硫酸镁,所得有机相浓缩,浓缩液用硅胶柱色谱分离,制得3-(N,N-二苄基氨基)甲基二环[2.2.1]庚基-2-硼酸频哪醇酯,收率45%;1HNMR(500MHz,CDCl3)δ=7.35(d,J=7.3Hz,4H),7.29(t,J=7.5Hz,4H),7.21(t,J=7.2Hz,2H),3.81(d,J=13.7Hz,2H),3.21(d,J=13.7Hz,2H),2.41(d,J=3.5Hz,1H),2.35-2.30(m,1H),2.16(dd,J=12.2,5.2Hz,1H),2.11(d,J=2.4Hz,1H),1.99-1.94(m,1H),1.54-1.44(m,2H),1.23-1.22(m,1H),1.17(s,6H),1.13(s,6H),1.11-1.07(m,2H),1.01(d,J=8.6Hz,1H),0.94(d,J=9.8Hz,1H);13C NMR(126MHz,CDCl3)δ=139.83,129.01,128.03,126.67,82.70,58.15,57.39,43.28,38.96,38.57,34.80,31.73,29.93,25.05,24.80;11BNMR(128MHz,CDCl3)δ=34.29;HRMS(ESI)m/z:calculated for[C28H38BNO2+H]+432.3068,found 432.3052。
实施例6:制备(E)-1,2-二苯基-3-(N,N-二苄基氨基)-1-丙烯基硼酸频哪醇酯
向干燥的Schlenk反应管中加入36mg(0.2mmol)二苯乙炔、102.0mg(0.4mmol)双(频哪醇合)二硼、8.0mg(0.04mmol)Cu(OAc)2铜盐和25.0mg(0.04mmol)2,2′-双(二苯基膦)-1,1′-联萘(BINAP)配体,使用Schlenk双排管抽真空,通入氩气,反复三次,在通入氩气状态下,加入1.0mL四氢呋喃和97.0mg(0.4mmol)N,O-缩醛胺,密封反应体系,控制反应体系温度25~30℃,搅拌反应48小时后,加入0.5mL氨水和15mL乙酸乙酯,搅拌30分钟,萃取分液,分离出的有机相用无水硫酸镁干燥,除去硫酸镁,所得有机相浓缩,浓缩液用硅胶柱色谱分离,制得(E)-1,2-二苯基-3-(N,N-二苄基氨基)-1-丙烯基硼酸频哪醇酯,收率51%;1HNMR(500MHz,CDCl3)δ=7.21-7.18(m,6H),7.12-7.11(m,4H),7.09-7.03(m,5H),7.01-6.96(m,3H),6.72-6.71(m,2H),3.71(s,4H),3.61(s,2H),1.28(s,12H);13C NMR(126MHz,CDCl3)δ=146.34,141.06,139.82,138.23,129.80,129.35,129.24,127.96,127.48,127.22,127.02,126.19,125.38,82.97,59.88,58.02,25.46;11B NMR(128MHz,CDCl3)δ=27.69;HRMS(ESI)m/z:calculated for[C35H38BNO2+H]+516.3068,found 516.3055。
实施例7:制备3-苯基-4-(N,N-二苄基氨基)-1-丁烯基-2-硼酸频哪醇酯
向干燥的Schlenk反应管中加入153mg(0.6mmol)双(频哪醇合)二硼、7.5mg(0.02mmol)Cu(CH3CN)4PF6和14.0mg(0.04mmol)2-(二环己基膦基)联苯(CyJohnPhos)配体,使用Schlenk双排管抽真空,通入氩气,反复三次,在通入氩气状态下,加入1.0mL二氯甲烷、72.5mg(0.3mmol)N,O-缩醛胺和34mg(0.2mmol)1-苯基丙二烯,密封反应体系,控制反应体系温度20~25℃,搅拌反应36小时后,加入0.5mL氨水和15mL乙酸乙酯,搅拌30分钟,萃取分液,分离出的有机相用无水硫酸镁干燥,除去硫酸镁,所得有机相浓缩,浓缩液用硅胶柱色谱分离,制得3-苯基-4-(N,N-二苄基氨基)-1-丁烯基-2-硼酸频哪醇酯,收率68%;1H NMR(500MHz,CDCl3)δ=7.24-7.14(m,13H),7.10-7.06(m,2H),5.81(d,J=2.5Hz,1H),5.48(d,J=1.6Hz,1H),3.87(t,J=7.7Hz,1H),3.70(d,J=13.8Hz,2H),3.40(d,J=13.8Hz,2H),2.93-2.85(m,2H),1.17(s,6H),1.13(s,6H);13C NMR(126MHz,CDCl3)δ=143.11,139.55,129.07,128.93,128.78,127.96,127.78,126.61,125.80,83.34,58.07,57.54,48.53,24.72,24.63;11B NMR(128MHz,CDCl3)δ=30.63;HRMS(ESI)m/z:calculated for[C30H36BNO2+H]+454.2912,found 454.2901。
Claims (5)
2.根据权利要求1所述的一种铜催化合成γ-氨基硼酸酯的方法,其特征在于铜盐是Cu(CH3CN)4PF6,Cu(CH3CN)4BF4,Cu(OAc)2,Cu(OTf)2。
3.根据权利要求1所述的一种铜催化合成γ-氨基硼酸酯的方法,其特征在于膦配体是2-(二环己基膦基)联苯(CyJohnPhos),三苯基膦(PPh3),2-双环己基膦-2′,6′-二甲氧基联苯(SPhos),2-二环己基膦-2,4,6-三异丙基联苯(XPhos),2,2′-双(二苯基膦)-1,1′-联萘(BINAP)。
4.根据权利要求1所述的一种铜催化合成γ-氨基硼酸酯的方法,其特征在于溶剂是甲苯,二氯甲烷,四氢呋喃,1,4-二氧六环。
5.根据权利要求1所述的一种铜催化合成γ-氨基硼酸酯的方法,其特征在于烯烃或炔烃1∶双(频哪醇合)二硼2∶N,O-缩醛胺3∶铜盐∶膦配体的用量摩尔比例为1.0∶1.5~3.0∶1.5~3.0∶0.1~0.2∶0.2~0.4。
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CN114315699A (zh) * | 2022-01-14 | 2022-04-12 | 江苏海洋大学 | 一种铜催化合成2-烯基吡啶类化合物的方法 |
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CN114315699A (zh) * | 2022-01-14 | 2022-04-12 | 江苏海洋大学 | 一种铜催化合成2-烯基吡啶类化合物的方法 |
CN114315699B (zh) * | 2022-01-14 | 2023-09-19 | 江苏海洋大学 | 一种铜催化合成2-烯基吡啶类化合物的方法 |
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