CN106242996B - 一种希夫碱镁金属有机化合物及其制备方法和应用 - Google Patents

一种希夫碱镁金属有机化合物及其制备方法和应用 Download PDF

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CN106242996B
CN106242996B CN201610628071.5A CN201610628071A CN106242996B CN 106242996 B CN106242996 B CN 106242996B CN 201610628071 A CN201610628071 A CN 201610628071A CN 106242996 B CN106242996 B CN 106242996B
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马猛涛
王未凡
秦奕
沈兴超
李佳
姚薇薇
朱丽珺
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Nanjing Fennuoke New Materials Co., Ltd.
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Abstract

本发明公开了希夫碱镁金属有机化合物及其制备和应用。制备方法包括:1)将2,4,6‑三叔丁基苯胺,3,5‑二叔丁基水杨醛和对甲苯磺酸在乙醇中加热回流至反应完全,析出大量淡黄色晶体,即为2‑(2,4,6‑三叔丁基)‑3,5‑二叔丁基希夫碱;2)无水无氧条件下,2‑(2,4,6‑三叔丁基)‑3,5‑二叔丁基希夫碱和2‑(2,6‑二(二苯甲基)‑4‑异丙基)‑3,5‑二叔丁基希夫碱分别与甲基碘化镁反应,得到大量无色晶体,即为2‑(2,4,6‑三叔丁基)‑3,5‑二叔丁基希夫碱镁金属化合物和2‑(2,6‑二(二苯甲基)‑4‑异丙基)‑3,5‑二叔丁基希夫碱镁碘化物;3)2‑(2,6‑二(二苯甲基)‑4‑异丙基)‑3,5‑二叔丁基希夫碱镁碘化物与金属钠反应,得到浅黄色晶体,即为2‑(2,6‑二(二苯甲基)‑4‑异丙基)‑3,5‑二叔丁基钠镁双金属化合物。

Description

一种希夫碱镁金属有机化合物及其制备方法和应用
技术领域
本发明涉及金属有机化合物制备技术领域,具体涉及一种希夫碱镁金属有机化合物及其制备和应用。
背景技术
硅氢化是硅的氢化物加到不饱和有机化合物上,从而生成各种有机硅化合物的反应。1947年,Leo Sommer等报道了第一个硅氢化反应,即三氯甲硅烷和1-辛烯在过氧化乙酰中的反应[L.Sommer,E.Pietrusza,F.Whitmore,J.Am.Chem.Soc.1947,69,188]。酮被催化还原为仲醇在有机化学中是最基本的反应之一。硅氢化是还原C=O键最重要、最有效的方法之一[K.Revunova,G.I.Nikonov,Chem.Eur.J.2014,20,839-845;H.Zhao,H.Sun,X.Li,Organometallics 2014,33,3535-3539;X.Ren,H.Du,J.Am.Chem.Soc.2016,138,810-813]。酮的硅氢化产物硅醚可以通过简单的水解转化为醇。最常见的金属催化的硅氢化机理主要包括氧化加成─还原消除,氢化物路易斯酸活化,单电子过程或σ-键置换作用[X.Qin,X.Liu,C.Guo,H.Wu,Chin.J.Org.Chem.2016,36,60-71]。硅氢化最常见的催化剂主要是过渡族金属和主族金属。比如,Gade等最近报道的三齿手性铁化合物作为催化剂在硅氢化反应中具有很高的活性和选择性[T.Bleith,H.Wadepohl,L.H.Gade,J.Am.Chem.Soc.2015,137,2456-2459]。但是,地球上资源丰富的金属,如碱土金属,很少有硅氢化的报道,只有少部分关于第二主族金属化合物催化烯烃硅氢化的报道,羰基硅氢化的报道非常少见[F.Buch,J.Brettar,S.Harder,Angew.Chem.Int.Ed.2006,45,2741–2745;M.S.Hill,G.Kociok-D.J.MacDougall,M.F.Mahon,C.Weetman,Dalton Trans.2011,40,12500–12509;V.Leich,T.P.Spaniol,L.Maron,J.Okuda,Chem.Commun.2014,50,2311–2314]。据我们所知,目前只有两例关于镁的硅氢化的报道。一是Sadow等用镁的硼氢化合物催化α,β-不饱和酯的1,4-硅氢化[N.L.Lampland,A.Pindwal,S.R.Neal,S.Schlauderaff,A.Ellern,A.D.Sadow,Chem.Sci.2015,6,6901–6907]。另一个是2016年Stasch等以苯硅烷作为氢源用一系列膦亚胺镁金属化合物催化2-金刚酮或苯甲酮的硅氢化反应[L.Fohlmeister,A.Stasch,Chem.Eur.J.2016,22,10235–10246]。
另一方面,希夫碱配体在配位化学、催化化学方面很普及,因为它容易制备、产率高和能与金属很好的配位[P.Das,W.Linert,Coord.Chem.Rev.2016,311,1-23;Y.Jia,J.Li,Chem.Rev.2015,115,1597-1621;D.Hager,D.W.C.MacMillan,J.Am.Chem.Soc.2014,136,16986-16989]。许多希夫碱配体已经广泛应用于过渡族金属和P区金属。比如,Cu-Sm-希夫碱金属化合物在顺式选择催化不对称nitro-Mannich反应中具有良好的催化效果[S.Handa,V.Gnanadesikan,S.Matsunaga,M.Shibasaki,J.Am.Chem.Soc.2010,132,4925–4934]。希夫碱与S区金属的反应及应用研究相对稀少,主要是与过渡周期金属相比,S区金属较为活泼,反应需要无水无氧下进行[R.K.J.Bott,M.Schormann,D.L.Hughes,S.J.Lancaster,M.Bochmann,Polyhedron 2006,25,387–396;W.Hung,C.Lin,Inorg.Chem.2009,48,728–734;H.W.Ou,K.H.Lo,W.T.Du,W.Y.Lu,W.J.Chuang,B.H.Huang,H.Y.Chen,C.C.Lin,Inorg.Chem.2016,55,1423–1432]。如Rood等已经合成三个水杨醛镁金属化合物,并研究了镁金属中心配位环境与配体空间位阻的影响[G.T.Quinque,A.G.Oliver,J.A.Rood,Eur.J.Inorg.Chem.2011,3321–3326]。Chakraborty等成功用希夫碱与镁化合物反应合成出一系列新的镁化合物,其在开环聚合反应中可作为良好的催化剂[S.Ghosh,D.Chakraborty,V.Ramkumar,J.Polym.Sci.Pol.Chem.2015,53,1474–1491]。
由于金属化合物催化酮的硅氢化具有很高的效率[N.L.Lampland,A.Pindwal,S.R.Neal,S.Schlauderaff,A.Ellern,A.D.Sadow,Chem.Sci.2015,6,6901–6907;L.Fohlmeister,A.Stasch,Chem.Eur.J.2016,22,10235–10246;S.Harder,Chem.Rev.2010,110,3852–3876],我们开始对寻求能代替传统的过渡金属催化剂,更便宜,更环保的良性体系充满兴趣。但在现有技术中,没有希夫碱镁金属化合物的应用及钠镁双金属的合成与应用。
发明内容
发明目的:针对现有技术中存在的不足,本发明的目的是提供一种以席夫碱为配体的镁金属有机化合物。本发明的另一目的是提供上述以席夫碱为配体的镁金属有机化合物的制备方法。本发明还有一目的是提供一种上述以席夫碱为配体的镁金属有机化合物的应用。
技术方案:为实现上述发明目的,本发明采用的技术方案是:
一种希夫碱镁金属化合物,为:2-(2,4,6-三叔丁基)-3,5-二叔丁基希夫碱镁金属化合物,其结构式如下:
一种所述希夫碱镁金属化合物的制备方法,包括以下步骤:
(1)将2,4,6-三叔丁基苯胺,3,5-二叔丁基水杨醛和对甲苯磺酸在乙醇中加热回流36-48h,-30-4℃析出大量淡黄色晶体,即2-(2,4,6-三叔丁基)-3,5-二叔丁基希夫碱,结构式如下:
其中,2,4,6-三叔丁基苯胺、3,5-二叔丁基水杨醛、对甲苯磺酸的摩尔比为6:6:1-2;化学反应式表示如下:
(2)无水无氧条件下、单口反应管中,2-(2,4,6-三叔丁基)-3,5-二叔丁基希夫碱溶于甲苯中,-80℃,甲基碘化镁逐滴加入上述溶液,室温反应15-19h,浓缩,-30-4℃下得到大量无色晶体,即为希夫碱镁金属化合物。其中,2-(2,4,6-三叔丁基)-3,5-二叔丁基希夫碱与甲基碘化镁摩尔比为1:2;其反应式如下:
所述的希夫碱镁金属化合物作为催化剂在催化酮的硅氢化反应的应用。
所述的应用,包括以下步骤:
(1)在无水无氧条件下,将上述镁金属有机化合物溶于溶剂中,加入三乙氧基硅烷,再加入酮,于70℃反应22h。
(2)反应结束后,加入氢氧化钠水溶液搅拌约30min,用乙醚萃取,分离得到最终产物。
所述步骤(1)中酮与催化剂的摩尔比为10:1。
一种钠镁双金属化合物,为:2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基钠镁双金属化合物,其结构式如下:
一种所述钠镁双金属化合物的制备方法,包括以下步骤:
(1)无水无氧条件下、单口反应管中,将2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基希夫碱化合物溶于乙醚溶液中,-80--40℃,甲基碘化镁逐滴加入上述溶液,室温反应10-20h,过滤浓缩,加入正己烷,析出大量黄色晶体,即2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基希夫碱镁碘化物。
其中,2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基希夫碱与甲基碘化镁的摩尔比为1:1;化学反应式表示如下:
(2)无水无氧条件下、单口反应管中,2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基希夫碱镁碘化物溶于甲苯,转移至钠镜,反应48h,过滤,滤液抽干,加入THF,数天后得到浅黄色晶体即2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基钠镁双金属化合物。其中,2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基希夫碱镁化合物与金属钠摩尔比为1:5-20;反应式如下:
所述的希夫碱钠镁双金属化合物作为催化剂在催化酮的硅氢化反应的应用。
有益效果:与现有技术相比,本发明具有下列优点:
1)本发明所述的希夫碱配体为新的配体,合成设计了全新的希夫碱镁金属化合物,从而开发了新型高效的希夫碱镁金属催化剂。
2)本发明公开的制备方法,反应过程简单易操作,实验中所需物品毒性小,安全环保,产物易提纯、得率高,且在室温下可以储存。
3)本发明所述的希夫碱镁金属化合物能够有效的催化酮的硅氢化反应。
具体实施方式
下面结合实施例对本发明作进一步说明。以下实施例中,过滤、抽干、萃取、浓缩、冷冻结晶、分离等操作步骤属于现有技术,本领域技术人员可以根据实际产物的性质予以选择。
实施例1
2-(2,4,6-三叔丁基)-3,5-二叔丁基希夫碱配体的制备,过程如下:
在100mL的圆底烧瓶中加入2,4,6-三叔丁基苯胺10.04mmol,3,5-二叔丁基水杨醛10.04mmol、对甲苯磺酸1.67mmol和乙醇100mL,回流反应48h。-30℃析出大量淡黄色晶体,过滤,质量为4.32g,即为2-(2,4,6-三叔丁基)-3,5-二叔丁基希夫碱,产率为90%。M.p.178-180℃。
核磁共振谱:1H NMR(600MHz,298K,C6D6):δ1.26(s,9H,C(CH3)3),1.38(s,9H,C(CH3)3),1.39(s,18H,C(CH3)3),1.65(s,9H,C(CH3)3),7.03(d,JH-H=2.4Hz,1H,Ar-H),7.56(s,2H,Ar-H),7.63(d,JH-H=2.4Hz,1H,Ar-H),7.92(s,1H,CH=N),14.14(s,1H,OH)ppm.13C{1H}NMR(151MHz,C6D6):δ29.8,31.6,31.8,32.4,34.3,35.0,35.5,36.1,118.1,122.2,126.8,128.4,128.6,137.8,140.9,141.0,146.0,148.5,159.1,169.8(CH=N)ppm。
实施例2
2-(2,4,6-三叔丁基)-3,5-二叔丁基希夫碱配体的制备,过程如下:
在100mL的圆底烧瓶中加入2,4,6-三叔丁基苯胺10.0mmol,3,5-二叔丁基水杨醛10.0mmol、对甲苯磺酸2.5mmol和乙醇100mL,回流反应24h。-10℃析出大量淡黄色晶体,过滤,质量为4.2g,即为2-(2,4,6-三叔丁基)-3,5-二叔丁基希夫碱,产率为89%。M.p.178-180℃。
核磁共振谱:1H NMR(600MHz,298K,C6D6):δ1.26(s,9H,C(CH3)3),1.38(s,9H,C(CH3)3),1.39(s,18H,C(CH3)3),1.65(s,9H,C(CH3)3),7.03(d,JH-H=2.4Hz,1H,Ar-H),7.56(s,2H,Ar-H),7.63(d,JH-H=2.4Hz,1H,Ar-H),7.92(s,1H,CH=N),14.14(s,1H,OH)ppm.13C{1H}NMR(151MHz,C6D6):δ29.8,31.6,31.8,32.4,34.3,35.0,35.5,36.1,118.1,122.2,126.8,128.4,128.6,137.8,140.9,141.0,146.0,148.5,159.1,169.8(CH=N)ppm。
实施例3
2-(2,4,6-三叔丁基)-3,5-二叔丁基希夫碱配体的制备,过程如下:
在100mL的圆底烧瓶中加入2,4,6-三叔丁基苯胺9.0mmol,3,5-二叔丁基水杨醛9.0mmol、对甲苯磺酸3mmol和乙醇100mL,回流反应12h。4℃析出大量淡黄色晶体,过滤,质量为3.86g,即为2-(2,4,6-三叔丁基)-3,5-二叔丁基希夫碱,产率为90%。M.p.178-180℃。
核磁共振谱:1H NMR(600MHz,298K,C6D6):δ1.26(s,9H,C(CH3)3),1.38(s,9H,C(CH3)3),1.39(s,18H,C(CH3)3),1.65(s,9H,C(CH3)3),7.03(d,JH-H=2.4Hz,1H,Ar-H),7.56(s,2H,Ar-H),7.63(d,JH-H=2.4Hz,1H,Ar-H),7.92(s,1H,CH=N),14.14(s,1H,OH)ppm.13C{1H}NMR(151MHz,C6D6):δ29.8,31.6,31.8,32.4,34.3,35.0,35.5,36.1,118.1,122.2,126.8,128.4,128.6,137.8,140.9,141.0,146.0,148.5,159.1,169.8(CH=N)ppm。
实施例4
2-(2,4,6-三叔丁基)-3,5-二叔丁基希夫碱镁金属化合物,过程如下:
在无水无氧下,单口反应管中,2-(2,4,6-三叔丁基)-3,5-二叔丁基希夫碱2.25mmol溶于30mL甲苯,-80℃,甲基碘化镁(1.5mL 3M in Et2O,4.5mmol)逐滴加入上述溶液中,室温反应19h。过滤,滤液浓缩至10mL,-30℃数天得到无色晶体,质量1.4g,即为希夫碱镁金属化合物,产率64%。M.p.240-242℃。
核磁共振谱:1H NMR(600MHz,C6D6):δ1.03(s,9H,C(CH3)3),1.22(s,9H,C(CH3)3),1.25(s,9H,C(CH3)3),1.28(s,9H,C(CH3)3),1.31(s,9H,C(CH3)3),1.38(s,9H,C(CH3)3),1.46(s,18H,C(CH3)3),1.60(s,9H,C(CH3)3),1.63(s,9H,C(CH3)3),6.86(d,JH-H=2.4Hz,1H,Ar-H),7.03(d,JH-H=2.4Hz,1H,Ar-H),7.42(d,JH-H=2.4Hz,1H,Ar-H),7.54(s,2H,Ar-H),7.58(d,JH-H=1.8Hz,1H,Ar-H),7.61(d,JH-H=2.4Hz,1H,Ar-H),7.71(d,JH-H=3.0Hz,1H,Ar-H),8.05(s,1H,CH=N),8.30(s,1H,CH=N)ppm.13C{1H}NMR(151MHz,C6D6):29.9,30.6,31.57,31.64,31.7,33.1,33.6,33.97,33.99,34.8,35.0,35.4,35.7,35.9,36.6,36.7,38.1,118.9,120.1,123.8,125.5,128.4,129.9,130.0,130.7,131.6,135.7,135.9,141.5,141.8,142.2,142.6,142.8,146.7,147.4,149.4,151.7,167.9,169.3,177.2(CH=N),177.6(CH=N)ppm。
实施例5
2-(2,4,6-三叔丁基)-3,5-二叔丁基希夫碱镁金属化合物,过程如下:
在无水无氧下,单口反应管中,2-(2,4,6-三叔丁基)-3,5-二叔丁基希夫碱3.0mmol溶于30mL甲苯,-80℃,甲基碘化镁(2.0mL 3M in Et2O,6.0mmol)逐滴加入上述溶液中,室温反应17h。过滤,滤液浓缩至10mL,-10℃数天得到无色晶体,质量1.92g,即为希夫碱镁金属化合物,产率66%。M.p.240-242℃。
核磁共振谱:1H NMR(600MHz,C6D6):δ1.03(s,9H,C(CH3)3),1.22(s,9H,C(CH3)3),1.25(s,9H,C(CH3)3),1.28(s,9H,C(CH3)3),1.31(s,9H,C(CH3)3),1.38(s,9H,C(CH3)3),1.46(s,18H,C(CH3)3),1.60(s,9H,C(CH3)3),1.63(s,9H,C(CH3)3),6.86(d,JH-H=2.4Hz,1H,Ar-H),7.03(d,JH-H=2.4Hz,1H,Ar-H),7.42(d,JH-H=2.4Hz,1H,Ar-H),7.54(s,2H,Ar-H),7.58(d,JH-H=1.8Hz,1H,Ar-H),7.61(d,JH-H=2.4Hz,1H,Ar-H),7.71(d,JH-H=3.0Hz,1H,Ar-H),8.05(s,1H,CH=N),8.30(s,1H,CH=N)ppm.13C{1H}NMR(151MHz,C6D6):29.9,30.6,31.57,31.64,31.7,33.1,33.6,33.97,33.99,34.8,35.0,35.4,35.7,35.9,36.6,36.7,38.1,118.9,120.1,123.8,125.5,128.4,129.9,130.0,130.7,131.6,135.7,135.9,141.5,141.8,142.2,142.6,142.8,146.7,147.4,149.4,151.7,167.9,169.3,177.2(CH=N),177.6(CH=N)ppm。
实施例6
2-(2,4,6-三叔丁基)-3,5-二叔丁基希夫碱镁金属化合物,过程如下:
在无水无氧下,单口反应管中,2-(2,4,6-三叔丁基)-3,5-二叔丁基希夫碱2.5mmol溶于30mL甲苯,-80℃,甲基碘化镁(1.67mL 3M in Et2O,5.0mmol)逐滴加入上述溶液中,室温反应15h。过滤,滤液浓缩至10mL,4℃数天得到无色晶体,质量1.5g,即为希夫碱镁金属化合物,产率65%。M.p.240-242℃。
核磁共振谱:1H NMR(600MHz,C6D6):δ1.03(s,9H,C(CH3)3),1.22(s,9H,C(CH3)3),1.25(s,9H,C(CH3)3),1.28(s,9H,C(CH3)3),1.31(s,9H,C(CH3)3),1.38(s,9H,C(CH3)3),1.46(s,18H,C(CH3)3),1.60(s,9H,C(CH3)3),1.63(s,9H,C(CH3)3),6.86(d,JH-H=2.4Hz,1H,Ar-H),7.03(d,JH-H=2.4Hz,1H,Ar-H),7.42(d,JH-H=2.4Hz,1H,Ar-H),7.54(s,2H,Ar-H),7.58(d,JH-H=1.8Hz,1H,Ar-H),7.61(d,JH-H=2.4Hz,1H,Ar-H),7.71(d,JH-H=3.0Hz,1H,Ar-H),8.05(s,1H,CH=N),8.30(s,1H,CH=N)ppm.13C{1H}NMR(151MHz,C6D6):29.9,30.6,31.57,31.64,31.7,33.1,33.6,33.97,33.99,34.8,35.0,35.4,35.7,35.9,36.6,36.7,38.1,118.9,120.1,123.8,125.5,128.4,129.9,130.0,130.7,131.6,135.7,135.9,141.5,141.8,142.2,142.6,142.8,146.7,147.4,149.4,151.7,167.9,169.3,177.2(CH=N),177.6(CH=N)ppm。
实施例7
2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基希夫碱镁碘化物的制备,过程如下:
在无水无氧下,单口反应管中,2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基希夫碱3.66mmol溶于30mL乙醚溶液中,-80℃,甲基碘化镁(1.22mL,3.0M in Et2O,3.66mmol)逐滴加入上述溶液,有气体放出。室温反应10h,过滤浓缩至10mL,加入30mL正己烷,析出大量黄色晶体,过滤,质量为3.2g,产率为96%。M.p.229-231℃。
核磁共振谱:1H NMR(600MHz,C6D6):δ0.95(d,JH-H=7.2Hz,6H,CH(CH3)2),0.97(m,6H,CH3(Et2O)),1.28(s,9H,C(CH3)3),1.67(s,9H,C(CH3)3),2.46(sept,JH-H=7.2Hz,1H,CH(CH3)2),3.50(m,4H,OCH2(Et2O)),5.53(s,1H,CHPh2),6.29(s,1H,CHPh2),6.78-7.43(m,24H,Ar-H),7.60(s,1H,CH=N)ppm.13C{1H}NMR(151MHz,C6D6):δ14.1,23.7,29.6,31.0,31.3,31.6,33.5,33.6,35.3,52.5,67.0,126.3,126.4,127.0,127.5,127.7,129.8,130.0,130.4,131.0,138.4,140.0,143.3,143.4,145.9,146.2,178.9(CH=N)ppm。
实施例8
2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基希夫碱镁碘化物的制备,过程如下:
在无水无氧下,单口反应管中,2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基希夫碱3.65mmol溶于30mL乙醚溶液中,-60℃,甲基碘化镁(1.22mL,3.0M in Et2O,3.65mmol)逐滴加入上述溶液,有气体放出。室温反应15h,过滤浓缩至10mL,加入30mL正己烷,析出大量黄色晶体,过滤,质量为3.3g,产率为97%。M.p.229-231℃。
核磁共振谱:1H NMR(600MHz,C6D6):δ0.95(d,JH-H=7.2Hz,6H,CH(CH3)2),0.97(m,6H,CH3(Et2O)),1.28(s,9H,C(CH3)3),1.67(s,9H,C(CH3)3),2.46(sept,JH-H=7.2Hz,1H,CH(CH3)2),3.50(m,4H,OCH2(Et2O)),5.53(s,1H,CHPh2),6.29(s,1H,CHPh2),6.78-7.43(m,24H,Ar-H),7.60(s,1H,CH=N)ppm.13C{1H}NMR(151MHz,C6D6):δ14.1,23.7,29.6,31.0,31.3,31.6,33.5,33.6,35.3,52.5,67.0,126.3,126.4,127.0,127.5,127.7,129.8,130.0,130.4,131.0,138.4,140.0,143.3,143.4,145.9,146.2,178.9(CH=N)ppm。
实施例9
2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基希夫碱镁碘化物的制备,过程如下:
在无水无氧下,单口反应管中,2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基希夫碱3.66mmol溶于30mL乙醚溶液中,-40℃,甲基碘化镁(1.22mL,3.0M in Et2O,3.66mmol)逐滴加入上述溶液,有气体放出。室温反应20h,过滤浓缩至10mL,加入30mL正己烷,析出大量黄色晶体,过滤,质量为3.15g,产率为95%。M.p.229-231℃。
核磁共振谱:1H NMR(600MHz,C6D6):δ0.95(d,JH-H=7.2Hz,6H,CH(CH3)2),0.97(m,6H,CH3(Et2O)),1.28(s,9H,C(CH3)3),1.67(s,9H,C(CH3)3),2.46(sept,JH-H=7.2Hz,1H,CH(CH3)2),3.50(m,4H,OCH2(Et2O)),5.53(s,1H,CHPh2),6.29(s,1H,CHPh2),6.78-7.43(m,24H,Ar-H),7.60(s,1H,CH=N)ppm.13C{1H}NMR(151MHz,C6D6):δ14.1,23.7,29.6,31.0,31.3,31.6,33.5,33.6,35.3,52.5,67.0,126.3,126.4,127.0,127.5,127.7,129.8,130.0,130.4,131.0,138.4,140.0,143.3,143.4,145.9,146.2,178.9(CH=N)ppm。
实施例10
2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基钠镁双金属化合物的制备方法,过程如下:
在无水无氧下,单口反应管中,2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基希夫碱镁碘化物2.90mmol加入40mL甲苯,转移至钠镜14.5mmol,反应36h,过滤,滤液抽干,加入15mL THF,数天后得到浅黄色色晶体,质量1.0g,产率34%。M.p.142-144℃。
核磁共振谱:1H NMR(600MHz,C6D6):δ0.96(s,18H,C(CH3)3),1.02(d,JH-H=7.2Hz,12H,CH(CH3)2),1.25(s,18H,C(CH3)3),1.40(m,24H,CH2(THF)),2.48(broad sept,JH-H=7.2Hz,2H,CH(CH3)2),3.51(m,24H,OCH2(THF)),4.30(s,2H,CHPh2),5.17(s,2H,CHPh2),6.84-7.09(m,48H,Ar-H),7.24(s,2H,CH2)ppm.13C{1H}NMR(151MHz,C6D6):δ23.9,24.0,24.4,25.8,30.0,30.3,30.7,31.8,31.9,32.1,32.4,33.4,33.6,33.8,33.9,34.0,34.1,34.5,35.2,35.7,51.9,52.4,52.6,63.8,67.8,121.5,125.4,125.9,126.5,127.0,127.9,128.0,129.1,130.0,130.2,134.0,135.6,136.9,138.2,139.3,144.4,146.2,157.2,160.7ppm。
实施例11
2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基钠镁双金属化合物的制备方法,过程如下:
在无水无氧下,单口反应管中,2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基希夫碱镁碘化物2.90mmol加入40mL甲苯,转移至钠镜29.0mmol,反应48h,过滤,滤液抽干,加入15mL THF,数天后得到浅黄色色晶体,质量1.05g,产率35%。M.p.142-144℃。
核磁共振谱:1H NMR(600MHz,C6D6):δ0.96(s,18H,C(CH3)3),1.02(d,JH-H=7.2Hz,12H,CH(CH3)2),1.25(s,18H,C(CH3)3),1.40(m,24H,CH2(THF)),2.48(broad sept,JH-H=7.2Hz,2H,CH(CH3)2),3.51(m,24H,OCH2(THF)),4.30(s,2H,CHPh2),5.17(s,2H,CHPh2),6.84-7.09(m,48H,Ar-H),7.24(s,2H,CH2)ppm.13C{1H}NMR(151MHz,C6D6):δ23.9,24.0,24.4,25.8,30.0,30.3,30.7,31.8,31.9,32.1,32.4,33.4,33.6,33.8,33.9,34.0,34.1,34.5,35.2,35.7,51.9,52.4,52.6,63.8,67.8,121.5,125.4,125.9,126.5,127.0,127.9,128.0,129.1,130.0,130.2,134.0,135.6,136.9,138.2,139.3,144.4,146.2,157.2,160.7ppm。
实施例12
2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基钠镁双金属化合物的制备方法,过程如下:
在无水无氧下,单口反应管中,2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基希夫碱镁碘化物2.90mmol加入40mL甲苯,转移至钠镜58.0mmol,反应60h,过滤,滤液抽干,加入15mL THF,数天后得到浅黄色色晶体,质量1.03g,产率35%。M.p.142-144℃。
核磁共振谱:1H NMR(600MHz,C6D6):δ0.96(s,18H,C(CH3)3),1.02(d,JH-H=7.2Hz,12H,CH(CH3)2),1.25(s,18H,C(CH3)3),1.40(m,24H,CH2(THF)),2.48(broad sept,JH-H=7.2Hz,2H,CH(CH3)2),3.51(m,24H,OCH2(THF)),4.30(s,2H,CHPh2),5.17(s,2H,CHPh2),6.84-7.09(m,48H,Ar-H),7.24(s,2H,CH2)ppm.13C{1H}NMR(151MHz,C6D6):δ23.9,24.0,24.4,25.8,30.0,30.3,30.7,31.8,31.9,32.1,32.4,33.4,33.6,33.8,33.9,34.0,34.1,34.5,35.2,35.7,51.9,52.4,52.6,63.8,67.8,121.5,125.4,125.9,126.5,127.0,127.9,128.0,129.1,130.0,130.2,134.0,135.6,136.9,138.2,139.3,144.4,146.2,157.2,160.7ppm。
实施例13
2-(2,4,6-三叔丁基)-3,5-二叔丁基希夫碱镁金属化合物催化苯乙酮与三乙氧基硅烷的反应,过程如下:
在手套箱中,在装有0.6mL C6D6的核磁管中依次加入二聚物0.0068mmol,苯乙酮0.068mmol与三乙氧基硅烷0.136mmol,然后将其移出手套箱,放入70℃的油浴中,反应22h,通过核磁谱图得出产率90%。
实施例14
2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基希夫碱镁碘化物催化苯乙酮与三乙氧基硅烷的反应,过程如下:
在手套箱中,在装有0.6mLC6D6的核磁管中依次加入镁的碘化物0.013mmol,苯乙酮0.13mmol与三乙氧基硅烷0.26mmol,然后将其移出手套箱,放入70℃的油浴中,反应22h,通过核磁谱图得出产率70%。
实施例15
2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基钠镁双金属化合物催化苯乙酮与三乙氧基硅烷的反应,过程如下:
在手套箱中,在装有0.6mLC6D6的核磁管中依次加入钠镁双金属化合物0.0074mmol,苯乙酮0.074mmol与三乙氧基硅烷0.148mmol,然后将其移出手套箱,室温下反应2h,通过核磁谱图得出产率93%。
实施例16
2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基钠镁双金属化合物催化异丁酰苯与三乙氧基硅烷的反应,过程如下:
在手套箱中,在装有0.6mLC6D6的核磁管中依次加入钠镁双金属化合物0.0049mmol,异丁酰苯0.049mmol与三乙氧基硅烷0.100mmol,然后将其移出手套箱,室温下反应15h,通过核磁谱图得出产率92%。
实施例17
2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基钠镁双金属化合物催化二苯甲酮与三乙氧基硅烷的反应,过程如下:
在手套箱中,在装有0.6mLC6D6的核磁管中依次加入钠镁双金属化合物0.0089mmol,二苯甲酮0.093mmol与三乙氧基硅烷0.186mmol,然后将其移出手套箱,室温下反应21h,通过核磁谱图得出产率82%。
实施例18
2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基钠镁双金属化合物催化对甲氧基苯乙酮与三乙氧基硅烷的反应,过程如下:
在手套箱中,在装有0.6mLC6D6的核磁管中依次加入钠镁双金属化合物0.0074mmol,对甲氧基苯乙酮0.074mmol与三乙氧基硅烷0.148mmol,然后将其移出手套箱,室温下反应2h,通过核磁谱图得出产率98%。
实施例19
2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基钠镁双金属化合物催化甲基酮环己酯与三乙氧基硅烷的反应,过程如下:
在手套箱中,在装有0.6mLC6D6的核磁管中依次加入钠镁双金属化合物0.0058mmol,甲基酮环己酯0.058mmol与三乙氧基硅烷0.116mmol,然后将其移出手套箱,室温下反应3h,通过核磁谱图得出产率90%。
实施例20
2-(2,6-二(二苯甲基)-4-异丙基)-3,5-二叔丁基钠镁双金属化合物催化对氨基苯乙酮与三乙氧基硅烷的反应,过程如下:
在手套箱中,在装有0.6mLC6D6的核磁管中依次加入钠镁双金属化合物0.0048mmol,对氨基苯乙酮0.049mmol与三乙氧基硅烷0.1mmol,然后将其移出手套箱,室温下反应4h,通过核磁谱图得出产率86%。

Claims (8)

1.一种希夫碱镁金属化合物,其结构式如下:
2.一种制备权利要求1所述的希夫碱镁金属化合物的方法,其特征在于,包括以下步骤:
1)将2,4,6-三叔丁基苯胺,3,5-二叔丁基水杨醛和对甲苯磺酸在乙醇中加热回流至反应12-48h,-30-4℃析出大量淡黄色晶体,即为N-(2,4,6-三叔丁基苯基)-3,5-二叔丁基-2-羟基苯甲亚胺,其结构式如下:
其中,2,4,6-三叔丁基苯胺、3,5-二叔丁基水杨醛、对甲苯磺酸的摩尔比为6:6:1-2;
2)无水无氧条件下、单口反应管中,N-(2,4,6-三叔丁基苯基)-3,5-二叔丁基-2-羟基苯甲亚胺溶于甲苯中,-80℃,甲基碘化镁逐滴加入上述溶液,然后室温反应15-19h,浓缩,-30-4℃下得到大量无色晶体,即为希夫碱镁金属化合物;其中,N-(2,4,6-三叔丁基苯基)-3,5-二叔丁基-2-羟基苯甲亚胺与甲基碘化镁摩尔比为1:2。
3.权利要求1所述的希夫碱镁金属化合物作为催化剂在催化酮的硅氢化反应中的应用。
4.根据权利要求3所述的应用,其特征在于,包括以下步骤:
1)在无水无氧条件下,将希夫碱镁金属化合物溶于溶剂中,加入三乙氧基硅烷,再加入酮,于70℃反应22h;
2)反应结束后,加入氢氧化钠水溶液搅拌30min,用乙醚萃取,分离得到最终产物。
5.根据权利要求4所述的应用,其特征在于:步骤1)中,酮与催化剂的摩尔比为10:1。
6.一种钠镁双金属化合物,其结构式如下:
式中:
7.一种制备权利要求6所述的钠镁双金属化合物的制备方法,其特征在于,包括以下步骤:
(1)无水无氧条件下、单口反应管中,将N-(4-异丙基-2,6-二(二苯甲基)苯基)-3,5-二叔丁基-2-羟基苯甲亚胺溶于乙醚溶液中,-80--40℃,甲基碘化镁逐滴加入上述溶液,室温反应10-20h,过滤浓缩,加入正己烷,析出大量黄色晶体,即为化合物A,反应式如下:
(2)无水无氧条件下、单口反应管中,加入化合物A和甲苯,转移至钠镜,反应36-60h,过滤,滤液抽干,加入THF,数天后得到浅黄色晶体钠镁双金属化合物;其中,化合物A与金属钠摩尔比为1:5-20;反应式如下:
8.权利要求6所述的钠镁双金属化合物作为催化剂在催化酮的硅氢化反应的应用。
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