CN115286485B - 一种合成仲醇的方法 - Google Patents

一种合成仲醇的方法 Download PDF

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CN115286485B
CN115286485B CN202210989398.0A CN202210989398A CN115286485B CN 115286485 B CN115286485 B CN 115286485B CN 202210989398 A CN202210989398 A CN 202210989398A CN 115286485 B CN115286485 B CN 115286485B
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吴江
张伟
韩腾飞
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Shanghai Coachchem Technology Co ltd
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Abstract

本发明提供了一种铁催化酮氢化合成仲醇的方法,其特征在于:基于亚铁化合物与α,α,α‑三联吡啶的联合作用下,催化酮的氢化反应,使其还原为仲醇。该方法产率高选择性高。

Description

一种合成仲醇的方法
技术领域
本发明涉及一种化学、立体选择性地合成仲醇的方法。
背景技术
结构多样的仲醇是有机合成领域中一类用途广泛的基础原料。酮的还原是合成仲醇最直接的方法。
传统的还原剂使用的是化学计量的铝氢和硅氢等金属氢试剂(Reductions bythe Alumino-and Borohydride in Organic Synthesis,2nd ed.,Wiley-VCH,New York,1997)。金属氢试剂的生产、储存和使用要求都比较严格,操作比较危险;另外,金属氢试剂在反应后会产生大量无机盐等副产物,加大了后处理的难度,不符合绿色化学的原则。
相比之下,以氢气作为还原剂的催化氢化方法具有反应操作及后处理简单、原子经济性高、污染小等优点,因而备受学术界和工业界的关注。目前酮的催化氢化使用的催化剂主要基于钌、铑、铱等贵金属(The Handbook of Homogeneous Hydrogenation deVries,J.G.;Elsevier,C.J.Eds.Wiley-VCH,Weinheim,2007),成本高,因此,发展基于铁等储量丰富价格低廉的丰产金属催化氢化体系具有重要的意义和很好的应用前景。
目前,文献报道的铁催化酮氢化体系主要是用茂基修饰的铁催化剂(Casey,C.P.;Guan,H.J.Am.Chem.Soc.2007,129,5816;Fleischer,S.;Zhou,S.-L.;Junge,K.;Beller,M.Angew.Chem.,Int.Ed.2013,52,5120)或者含磷配体修饰的铁催化剂(Langer,R.;Leitus,G.;Ben-David,Y.;Milstein,D.Angew.Chem.,Int.Ed.2011,50,2120;Lagaditis,P.O.;Sues,P.E.;Sonnenberg,J.F.;Wang,K.Y.;Lough,A.J.;Morris,R.H.J.Am.Chem.Soc.2014,136,1367)。尽管这些催化体系可以表现出一定的催化活性,但这些配体通常需要多步骤合成且稳定性差,还需要经过复杂的步骤预先制备出铁络合物才能进行催化反应,大大降低了它们的实用性。
发明内容
本发明要解决的问题是提供一种有效地铁催化酮氢化合成仲醇的方法,是由FeX2-α,α,α-三联吡啶络合物催化酮的氢化反应,高化学选择性(即、仅还原羰基而分子中其它官能团不还原如酯基、苯环等)和立体选择性(主要针对4-叔丁基环己酮或类似结构化合物的还原,其产物仅为反式产物)合成仲醇的方法。
本发明是通过以下技术方案来实现的:
本发明提供了一种铁催化酮氢化合成仲醇的方法,其特征在于:
基于亚铁化合物与α,α,α-三联吡啶的联合作用下,催化酮的氢化反应,使其还原为仲醇。
进一步地,本发明提供的一种铁催化酮氢化合成仲醇的方法,其特征还在于:
上述亚铁化合物选自FeF2、FeCl2、FeBr2、FeI2、Fe(OAc)2中的一种或几种。
进一步地,本发明提供的一种铁催化酮氢化合成仲醇的方法,其特征还在于:
上述酮选自烷基取代的酮、芳基取代的酮、环烷基酮。
进一步地,本发明提供的一种铁催化酮氢化合成仲醇的方法,其特征还在于:
上述酮的结构式如式A-1或A-2所示:
其中,R1,R2独立地选自C1-C20烷基、C6-C10芳基;
R3为一个或一个以上的取代基,其独立地选自C1-C20烷基、C6-C10芳基;
n选自0-5的自然数。
进一步地,本发明提供的一种铁催化酮氢化合成仲醇的方法,其特征还在于:
上述氢化反应所涉及的还原剂为氢气。
进一步地,本发明提供的一种铁催化酮氢化合成仲醇的方法,其特征还在于:
具体合成方法为:
向高压釜中加入亚铁化合物,α,α,α-三联吡啶,酮后,以1-50大气压的氢气为还原剂0-100℃的温度下,反应1-48小时制得仲醇。
反应温度优选:25-80℃;最优选为60℃以上的温度下进行。
反应时间优选为:24-48小时。
仲醇产物一般经过柱层析、重结晶或减压蒸馏得到。
进一步地,本发明提供的一种铁催化酮氢化合成仲醇的方法,其特征还在于:
上述酮、亚铁化合物、α,α,α-三联吡啶配体的摩尔比为1:0.0005-0.02:0.0005-0.02。
进一步地,本发明提供的一种铁催化酮氢化合成仲醇的方法,其特征还在于:
反应还可在溶剂条件下进行。
进一步地,本发明提供的一种铁催化酮氢化合成仲醇的方法,其特征还在于:
上述溶剂选自烷基苯、苯、环烷基、卤代烷、醚、酯、腈、醇、酰胺中的一种或几种。
具体如:甲苯、苯、正己烷、环己烷、二氯甲烷、四氢呋喃、乙醚、甲基叔丁基醚、二氧六环、乙二醇二甲醚、乙酸乙酯、乙腈、甲醇、乙醇、异丙醇、N,N-二甲基甲酰胺中的任意一种。
本发明还涉及一种催化剂,其特征在于:
上述催化剂包括亚铁化合物与α,α,α-三联吡啶;
上述催化剂用于催化氢化还原反应;
上述亚铁化合物与α,α,α-三联吡啶的摩尔比为0.0005-0.02:0.0005-0.02。
本发明提供的方法与现有方法相比:反应条件温和,操作简便,原子经济性100%,且反应无需使用价格昂贵的贵金属和配体,催化剂可现场生成无需预制备,有较大的实际应用价值。反应的官能团兼容性好,化学选择性和立体选择性高。
具体实施方式
下面通过实施例的方式进一步说明本发明,但并不因此将本发明限制在上述的实施例范围之中。
下述实施例采用的通用方法为:向高压釜中加入亚铁化合物FeX2,α,α,α-三联吡啶,各类酮后,以1-50大气压的氢气为还原剂0-100℃的温度下,反应24-48小时制得仲醇。
上述酮、亚铁化合物、α,α,α-三联吡啶配体的摩尔比为1:0.0005-0.02:0.0005-0.02。
优选实施例如下:
实施例1-5:FeX2催化的苯乙酮的氢化
向一125毫升高压釜中加入FeX2(0.01mmol),α,α,α-三联吡啶(2.3mg,0.01mmol),四氢呋喃1mL,苯乙酮(120mg,1mmol),将高压釜封好后,置换氢气3次后,充入氢气20大气压。将高压釜至于60度油浴中反应24小时。冷却至室温后,小心放掉氢气,柱层析(石油醚:乙酸乙酯=5:1)分离得到1-苯乙醇。1HN MR(400MHz,CDCl3)δ7.39-7.33(m,4H),7.29-7.26(m,1H),4.90(q,J=6.4Hz,1H),1.50(d,J=6.4Hz,3H).。
实施例 X Yield(%)/纯度(%)
1 OAc 96/99.4
2 Cl 92/99.5
3 Br 92/99.4
4 F 87/99.7
5 I 81/99.4
实施例6-10:Fe(OAc)2催化的苯乙酮的氢化-氢气压力影响
向一125毫升高压釜中加入Fe(OAc)2(1.7mg,0.01mmol),α,α,α-三联吡啶(2.3mg,0.01mmol),四氢呋喃1mL,苯乙酮(120mg,1mmol),将高压釜封好后,置换氢气3次后,充入氢气5-50大气压。将高压釜至于60度油浴中反应24小时。冷却至室温后,小心放掉氢气,柱层析(石油醚:乙酸乙酯=5:1)分离得到1-苯乙醇。1HNMR(400MHz,CDCl3)δ7.39-7.33(m,4H),7.29-7.26(m,1H),4.90(q,J=6.4Hz,1H),1.50(d,J=6.4Hz,3H).。
实施例 氢气压力(大气压) Yield(%)/纯度(%)
6 5 93/99.5
7 10 96/99.6
8 20 96/99.5
9 30 97/99.4
10 50 97/99.5
实施例11-15:Fe(OAc)2催化的苯乙酮的氢化-溶剂的影响
向一125毫升高压釜中加入Fe(OAc)2(1.7mg,0.01mmol),α,α,α-三联吡啶(2.3mg,0.01mmol),溶剂1mL,苯乙酮(120mg,1mmol),将高压釜封好后,置换氢气3次后,充入氢气20大气压。将高压釜至于60度油浴中反应24小时。冷却至室温后,小心放掉氢气,柱层析(石油醚:乙酸乙酯=5:1)分离得到1-苯乙醇。1H NMR(400MHz,CDCl3)δ7.39-7.33(m,4H),7.29-7.26(m,1H),4.90(q,J=6.4Hz,1H),1.50(d,J=6.4Hz,3H).
实施例 溶剂 Yield(%)/纯度(%)
11 甲苯 80/99.6
12 四氢呋喃 96/99.5
13 二氯甲烷 76/99.5
14 甲醇 90/99.3
15 乙酸乙酯 88/99.5
实施例16-18:Fe(OAc)2催化的苯乙酮的氢化-溶剂的影响
向一125毫升高压釜中加入Fe(OAc)2(1.7mg,0.01mmol),α,α,α-三联吡啶(2.3mg,0.01mmol),四氢呋喃1mL,苯乙酮(120mg,1mmol),将高压釜封好后,置换氢气3次后,充入氢气20大气压。将高压釜置于25-80度油浴中反应24小时。冷却至室温后,小心放掉氢气,柱层析(石油醚:乙酸乙酯=5:1)分离得到1-苯乙醇。1H NMR(400MHz,CDCl3)δ7.39-7.33(m,4H),7.29-7.26(m,1H),4.90(q,J=6.4Hz,1H),1.50(d,J=6.4Hz,3H).
实施例 温度(℃) Yield(%)/纯度(%)
16 25 63/99.1
17 60 95/99.6
18 80 96/99.1
实施例19:Fe(OAc)2催化的苯乙酮的氢化
向一125毫升高压釜中加入Fe(OAc)2(1.7mg,0.01mmol),α,α,α-三联吡啶(2.3mg,0.01mmol),四氢呋喃10mL,苯乙酮(2.40g,20mmol),将高压釜封好后,置换氢气3次后,充入氢气40大气压。将高压釜置于80度油浴中反应48小时。冷却至室温后,小心放掉氢气,除去溶剂,残余物进行减压蒸馏得到1-苯乙醇2.26g,产率93%(纯度99.6%)。1HNMR(400MHz,CDCl3)δ7.39-7.33(m,4H),7.29-7.26(m,1H),4.90(q,J=6.4Hz,1H),1.50(d,J=6.4Hz,3H).
实施例20:Fe(OAc)2催化的2-己酮的氢化
向一125毫升高压釜中加入Fe(OAc)2(1.7mg,0.01mmol),α,α,α-三联吡啶(2.3mg,0.01mmol),四氢呋喃1mL,2-己酮(100mg,1mmol),将高压釜封好后,置换氢气3次后,充入氢气20大气压。将高压釜置于60度油浴中反应24小时。冷却至室温后,小心放掉氢气,柱层析(石油醚:乙酸乙酯=6:1)分离得到2-己醇99mg,产率97%(纯度99.5%)。1HNMR(400MHz,CDCl3)δ3.74(dq,J=11.8,6.2Hz,1H),2.23(brs,1H),1.45-1.40(m,6H),1.14(d,J=6.2Hz,3H),0.86(d,J=7.2Hz,3H)。
实施例21:Fe(OAc)2催化的二苯甲酮的氢化
向一125毫升高压釜中加入Fe(OAc)2(1.7mg,0.01mmol),α,α,α-三联吡啶(2.3mg,0.01mmol),四氢呋喃1mL,二苯甲酮(182mg,1mmol),将高压釜封好后,置换氢气3次后,充入氢气20大气压。将高压釜置于60度油浴中反应24小时。冷却至室温后,小心放掉氢气,柱层析(石油醚:乙酸乙酯=6:1)分离得到二苯甲醇162mg,产率88%(纯度99.6%)。1H NMR(400MHz,CDCl3)δ7.48-7.20(m,10H),5.82(s,1H),2.52(br,1H)。
实施例22:Fe(OAc)2催化的4-叔丁基环己酮的氢化
向一125毫升高压釜中加入Fe(OAc)2(1.7mg,0.01mmol),α,α,α-三联吡啶(2.3mg,0.01mmol),四氢呋喃10mL,4-叔丁基环己酮(1.54g,10mmol),将高压釜封好后,置换氢气3次后,充入氢气20大气压。将高压釜置于60度油浴中反应24小时。冷却至室温后,小心放掉氢气,除去溶剂,残余物经重结晶(二氯甲烷/正己烷=1/5)后得到反式4-叔丁基环己醇1.36g,产率87%(纯度99.4%)。1H NMR(400MHz,CDCl3)δ3.51(tt,J=10.9,4.4Hz,1H),2.07-1.94(m,2H),1.82-1.71(m,2H),1.29-1.13(m,2H),1.10-0.91(m,3H),0.84(s,9H)。
实施例23:Fe(OAc)2催化的4-乙酰基苯甲酸甲酯的氢化
向一125毫升高压釜中加入Fe(OAc)2(1.7mg,0.01mmol),α,α,α-三联吡啶(2.3mg,0.01mmol),四氢呋喃10mL,4-乙酰基苯甲酸甲酯(890mg,5mmol),将高压釜封好后,置换氢气3次后,充入氢气20大气压。将高压釜置于60度油浴中反应24小时。冷却至室温后,小心放掉氢气,除去溶剂,残余物经柱层析(石油醚:乙酸乙酯=4:1)分离得到4-(1-羟乙基)苯甲酸甲酯846mg,产率94%(纯度99.5%)。1H NMR(400MHz,CDCl3)δ7.95(d,J=8.3Hz,2H),7.39(d,J=8.2Hz,2H),4.90(q,J=5.9Hz,1H),3.88(s,3H),2.91(brs,1H),1.46(d,J=6.5Hz,3H)。

Claims (5)

1.一种铁催化酮氢化合成仲醇的方法,其特征在于:
基于亚铁化合物与α,α,α-三联吡啶的联合作用下,催化酮的氢化反应,使其还原为仲醇;
所述亚铁化合物选自FeF2、FeCl2、FeBr2、FeI2、Fe(OAc)2中的一种或几种;
所述氢化反应所涉及的还原剂为氢气;
所述酮的结构式如式A-1或A-2所示:
其中,R1,R2独立地选自C1-C20烷基、C6-C10芳基;
R3为一个或一个以上的取代基,其独立地选自C1-C20烷基、C6-C10芳基;
n选自0-5的自然数。
2.如权利要求书1所述的一种铁催化酮氢化合成仲醇的方法,其特征在于:
具体合成方法为:
向高压釜中加入亚铁化合物,α,α,α-三联吡啶,酮后,以1-50大气压的氢气为还原剂0-100℃的温度下,反应1-48小时制得仲醇。
3.如权利要求书2所述的一种铁催化酮氢化合成仲醇的方法,其特征在于:
所述酮、亚铁化合物、α,α,α-三联吡啶配体的摩尔比为1:0.0005-0.02:0.0005-0.02。
4.如权利要求书2所述的一种铁催化酮氢化合成仲醇的方法,其特征在于:
反应在溶剂条件下进行。
5.如权利要求书4所述的一种铁催化酮氢化合成仲醇的方法,其特征在于:
所述溶剂选自烷基苯、苯、卤代烷、醚、酯、腈、醇、酰胺中的一种或几种。
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