CN109851486A - 一种钌络合物选择性氢化二烯酮的方法 - Google Patents
一种钌络合物选择性氢化二烯酮的方法 Download PDFInfo
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Abstract
本发明提供了一种钌络合物选择性氢化α,γ‑不饱和二烯酮的方法,具体涉及一种使用氢气在催化剂的作用下将α,γ‑不饱和二烯酮还原为相应的γ‑不饱和酮的方法,所使用的催化剂为钌络合物,由钌前体和配体原位制备得到。本发明主要优点在于催化剂由金属前体和配体原位制备得到,操作简便、催化剂活性高;吡啶、喹啉等含氮芳香杂环毒化剂的加入,有效抑制了产物γ‑不饱和酮的过渡加氢副反应,选择性良好,成本低廉。
Description
技术领域
本发明属于精细化工和香精香料领域,具体涉及一种由均相钌络合物选择性氢化α,γ-二烯酮得到γ-烯酮的方法。
背景技术
选择性的氢化共轭α,γ-二烯酮的α,β-碳碳双键是一类重要的反应,例如选择性氢化6-甲基-3,5-庚二烯-2-酮可以得到6-甲基-5-庚烯-2-酮,后者是芳樟醇、柠檬醛、香茅醛、紫罗兰酮等香料的重要合成中间体;β-紫罗兰酮选择性氢化为二氢β-紫罗兰酮,后者是合成龙涎香的关键中间体。由于α,γ-二烯酮含有三个不饱和双键,理论上存在多种不同的氢化产物,控制该类反应的选择性,实现α,β-碳碳双键的氢化是极具挑战性的目标,目前该领域已知的文献和专利报道也比较少。
已知文献报道中,Trost等人报道了将共轭烯酮氢化为酮的方法(ComprehensiveOrganic Chem,1991,18,535.),虽然反应的选择性很好,但是催化剂用量较大,反应时间也较长(4~24小时)。Ojima等人报道了一例铑催化的α,γ-不饱和二烯酮的选择性氢化,底物为β-紫罗兰酮,还原剂为氢硅烷。根据所采用还原剂氢硅烷的不同,反应的化学选择性也不同,使用单氢硅烷时,得到α,β-碳碳双键被还原的产物;使用双氢硅烷时,得到羰基被还原的产物(Organomet,1982,1390)。
绍丹等人报道了均相铑和双膦催化体系,实现了α,γ-不饱和二烯醛的选择性氢化,得到相应的去共轭γ-烯醛,该催化体系反应活性高,化学选择性良好,但是该专利并没有提及将该催化剂体系应用于α,γ-不饱和二烯酮底物的选择性氢化上(CN103384657A)。
综上所述,共轭α,γ-二烯酮的α,β-碳碳双键的选择性氢化,可以方便的合成多种重要的合成中间体,但是目前已知技术文献中缺少通用可行的技术,高收率、高选择性实现上述转化。
发明内容
本发明的目的在于提供一种钌络合物选择性氢化α,γ-不饱和二烯酮的方法,该方法包括:使用钌络合物作为催化剂,在氢气氛围中和毒化剂存在下,选择性将α,γ-不饱和二烯酮还原为相应的γ-不饱和酮。
进一步地,α,γ-不饱和二烯酮结构如式I所示,
其中,R1、R2、R3、R4、R5、R6彼此独立的表示取代或未取代的C1-C10的烷基(例如甲基、氯甲基、乙基、丙基、正丁基、异丁基、叔丁基、正戊基、正己基、正辛基)、C2-C10烯基(例如烯丙基)、C2-C10炔基(例如炔丙基)、C5-C12芳基(例如苯基、取代苯基等)。
反应路线如下所示:
进一步地,所述钌络合物由钌金属前体和配体原位制备得到,优选,钌金属前体和配体的摩尔比范围为1:1.05~4,更优选1:1.1~2.2。
本发明中,所述钌金属前体的用量为α,γ-不饱和二烯酮摩尔量的0.01~2.0mol%,优选0.1~1.0mol%。
本发明中,所述钌金属前体可以是但不限于RuCl3、Ru(acac)3、[Ru(COD)Cl2]、[Ru(COD)I2]、[Ru(NBD)Cl2]、[Ru(COD)OTf2]、[Ru(COD)(acac)]等,优选[Ru(COD)Cl2]。
本发明中,所述配体可以是但不限于双膦配体、亚膦酸配体、亚膦酰胺、氮膦配体等,例如双二苯基膦甲烷(dppm)、1,2-双二苯基膦乙烷(dppe)、1,3-双二苯基膦丙烷(dppp)、1,4-双二苯基膦丁烷(dppb)、1,1’-双二苯基膦二茂铁(dppf)、1,1’-联萘-2,2’-双二苯基膦(BINAP)、4,5-双二苯基膦-9,9-二甲氧基氧杂蒽(XantPhos)等,优选dppf作为配体。
本发明中,所述毒化剂用于抑制产物γ-不饱和酮的过渡加氢副反应,可以是但不限于吡啶、吡嗪、喹啉、喹喔啉以及取代的吡啶、吡嗪、喹啉、喹喔啉中的一种或多种,毒化剂用量为α,γ-不饱和二烯酮摩尔量的1.0~10.0mol%,优选2.0~5.0mol%。
本发明中,所述选择性氢化反应可以在甲醇、乙醇、丙醇、异丙醇、丁醇、三氟乙醇、四氢呋喃、丙酮等极性溶剂中进行,其中溶剂优选乙醇;溶剂用量为α,γ-不饱和二烯酮质量的2.0~5.0倍,优选2.5~3.0倍。
本发明中,所述选择性氢化反应的反应温度为20~60℃,优选30~40℃,和/或,反应压力为2.0~4.0MPa,反应时间1~3小时。
本发明中,所述氢气气氛可以是引入氢气至1.0-3.0MPa的压力,优选约2.0MPa的压力。
本发明中所述的压力为表压。
本发明采用上述技术方案,具有如下积极效果:
1、催化剂钌络合物由钌金属前体和配体原位制备,操作简单,催化剂活性高,成本低廉;
2、吡啶、喹啉等含氮芳香杂环毒化剂的加入,有效抑制了产物γ-不饱和酮的过渡加氢副反应,反应的选择性大于99%。
具体实施方式
下面通过实施例详述本发明,但本发明并不限于下述的实施例。
主要原料信息如下:
底物:β-紫罗兰酮、假紫罗兰酮、6-甲基-3,5-庚二烯-2-酮,自制,99%(GC);
溶剂:无水甲醇、乙醇、丙酮、四氢呋喃,西陇化工,AR;
配体:dppm、dppe、dppp、dppb、dppf、BINAP、XantPhos,百灵威,99%;
金属催化前体:[Ru(COD)Cl2]、RuCl3、Ru(acac)3、[Ru(NBD)Cl2]、[Ru(COD)OTf2]、[Ru(COD)(acac)]2,百灵威,99%;
毒化剂:喹啉、喹喔啉、吡嗪、吡啶,百灵威,99%。
本发明的气相色谱测试条件如下:
仪器型号:Agilent GC;色谱柱:Agilent DB-5(30m×0.25mm×0.25μm);柱温:起始温度40℃,以3℃/min升温至70℃,然后以10℃/min升温100℃,最后以12℃/min升温至280℃,保持6min;进样口温度:280℃;FID检测器温度:300℃;分流进样,分流比30:1;进样量:2.0μL;H2流量:40mL/min;空气流量:400mL/min。
实施例1~12
β-紫罗兰酮选择性氢化合成二氢β-紫罗兰酮条件优化
手套箱中,依次将[Ru(COD)Cl2](57mg,0.2mmol)、BINAP(0.138g,0.22mmol)和乙醇(10.0g)加入到装有磁力搅拌子的单口瓶中,开启搅拌,金属前体和配体溶解、配位10分钟后,得到浅黄色的催化剂溶液,将单口瓶密封,出手套箱,氮气保护下用平流泵打入高压釜中,高压釜已提前用氮气置换,并加入底物β-紫罗兰酮(19.622g,0.1mol)、毒化剂喹啉(261mg,2.0mmol)和溶剂乙醇(29.244g)。催化剂加入完毕,用氢气置换氮气三次,每次2.0MPa,最后充入2.0MPa的氢气,开启高压釜搅拌和伴热,当反应釜内温达到40℃时,开始计时,保温反应2小时,取样分析,GC检测反应的转化率和选择性。
进行实施例2~7时,金属前体为[Ru(COD)Cl2],将BINAP更换为等摩尔量的相应配体,其余反应条件保持不变;进行实施例8~12时,配体为dppf,将[Ru(COD)Cl2]更换为相应等摩尔量的金属前体,其余反应条件保持不变;进行实施例13~1时,金属前体为[Ru(COD)Cl2],配体为dppf,将喹啉更换为相应的等摩尔量的毒化剂,其他条件不变。
实施例1~12反应结果
实施例16
β-紫罗兰酮选择性氢化合成二氢β-紫罗兰酮
手套箱中,依次将[Ru(COD)Cl2](57mg,0.2mmol)、dppf(0.123g,0.22mmol)和丙酮(10.0g)加入到装有磁力搅拌子的单口瓶中,开启搅拌,金属前体和配体溶解、配位10分钟后,得到浅黄色的催化剂溶液,将单口瓶密封,出手套箱,氮气保护下用平流泵打入高压釜中,高压釜已提前用氮气置换,并加入底物β-紫罗兰酮(19.622g,0.1mol)、毒化剂喹啉(261mg,2.0mmol)和溶剂丙酮(29.244g)。催化剂加入完毕,用氢气置换氮气三次,每次2.0MPa,最后充入2.0MPa的氢气,开启高压釜搅拌,保持反应釜内温为20℃时,开始计时,保温反应3小时,取样分析,GC检测,β-紫罗兰酮转化率为99.2%,二氢β-紫罗兰酮选择性为99.8%。
实施例17
β-紫罗兰酮选择性氢化合成二氢β-紫罗兰酮
手套箱中,依次将[Ru(COD)Cl2](57mg,0.2mmol)、dppf(0.123g,0.22mmol)和四氢呋喃(10.0g)加入到装有磁力搅拌子的单口瓶中,开启搅拌,金属前体和配体溶解、配位10分钟后,得到浅黄色的催化剂溶液,将单口瓶密封,出手套箱,氮气保护下用平流泵打入高压釜中,高压釜已提前用氮气置换,并加入底物β-紫罗兰酮(19.622g,0.1mol)、毒化剂喹啉(261mg,2.0mmol)和溶剂四氢呋喃(29.244g)。催化剂加入完毕,用氢气置换氮气三次,每次2.0MPa,最后充入4.0MPa的氢气,开启高压釜搅拌,保持反应釜内温为60℃时,开始计时,保温反应1小时,取样分析,GC检测,β-紫罗兰酮转化率为99.9%,二氢β-紫罗兰酮选择性为97.6%。
实施例18
β-紫罗兰酮选择性氢化合成二氢β-紫罗兰酮
手套箱中,依次将[Ru(COD)Cl2](57mg,0.2mmol)、dppf(0.246g,0.44mmol)和丙酮(10.0g)加入到装有磁力搅拌子的单口瓶中,开启搅拌,金属前体和配体溶解、配位10分钟后,得到浅黄色的催化剂溶液,将单口瓶密封,出手套箱,氮气保护下用平流泵打入高压釜中,高压釜已提前用氮气置换,并加入底物β-紫罗兰酮(19.622g,0.1mol)、毒化剂喹啉(160mg,2.0mmol)和溶剂丙酮(29.244g)。催化剂加入完毕,用氢气置换氮气三次,每次2.0MPa,最后充入2.0MPa的氢气,开启高压釜搅拌,保持反应釜内温为30℃时,开始计时,保温反应2小时,取样分析,GC检测,β-紫罗兰酮转化率为99.2%,二氢β-紫罗兰酮选择性为99.8%。
实施例19
假性紫罗兰酮选择性氢化合成二氢假紫罗兰酮
手套箱中,依次将[Ru(COD)Cl2](57mg,0.2mmol)、dppf(0.246g,0.22mmol)和乙醇(10.0g)加入到装有磁力搅拌子的单口瓶中,开启搅拌,金属前体和配体溶解、配位10分钟后,得到浅黄色的催化剂溶液,将单口瓶密封,出手套箱,氮气保护下用平流泵打入高压釜中,高压釜已提前用氮气置换,并加入底物假性紫罗兰酮(19.622g,0.1mol)、毒化剂喹啉(160mg,2.0mmol)和溶剂乙醇(29.244g)。催化剂加入完毕,用氢气置换氮气三次,每次2.0MPa,最后充入2.0MPa的氢气,开启高压釜搅拌,保持反应釜内温为20℃时,开始计时,保温反应2小时,取样分析,GC检测,假性紫罗兰酮转化率为97.2%,二氢假紫罗兰酮选择性为98.8%。
实施例20
6-甲基-3,5-庚二烯-2-酮选择性氢化合成6-甲基-5-庚烯-2-酮
手套箱中,依次将[Ru(COD)Cl2](57mg,0.2mmol)、dppf(0.246g,0.22mmol)和乙醇(10.0g)加入到装有磁力搅拌子的单口瓶中,开启搅拌,金属前体和配体溶解、配位10分钟后,得到浅黄色的催化剂溶液,将单口瓶密封,出手套箱,氮气保护下用平流泵打入高压釜中,高压釜已提前用氮气置换,并加入底物6-甲基-3,5-庚二烯-2-酮(12.653g,0.1mol)、毒化剂喹啉(160mg,2.0mmol)和溶剂乙醇(29.244g)。催化剂加入完毕,用氢气置换氮气三次,每次2.0MPa,最后充入2.0MPa的氢气,开启高压釜搅拌,保持反应釜内温为20℃时,开始计时,保温反应2小时,取样分析,GC检测,6-甲基-3,5-庚二烯-2-酮转化率为98.3%,6-甲基-5-庚烯-2-酮选择性为99.5%。
Claims (9)
1.一种钌络合物选择性氢化α,γ-不饱和二烯酮的方法,该方法包括:使用钌络合物作为催化剂,在氢气氛围中和毒化剂的存在下进行选择性氢化反应,选择性将α,γ-不饱和二烯酮还原为相应的γ-不饱和酮。
2.根据权利要求1所述的方法,其中,所述钌络合物由钌金属前体和配体原位制备得到,优选,钌金属前体和配体的摩尔比范围为1:1.05~4,更优选1:1.1~2.2。
3.根据权利要求1或2所述的方法,其中,α,γ-不饱和二烯酮为结构式I所示的化合物:
其中,R1、R2、R3、R4、R5、R6彼此独立的表示彼此独立的表示取代或未取代的C1-C10的烷基(例如甲基、氯甲基、乙基、丙基、正丁基、异丁基、叔丁基、正戊基、正己基、正辛基)、C2-C10烯基(例如烯丙基)、C2-C10炔基(例如炔丙基)、C5-C12芳基(例如苯基、取代苯基等)。
4.根据权利要求1-3中任一项所述的方法,其特征在于,所述钌金属前体的用量为α,γ-不饱和二烯酮摩尔量的0.01~2.0mol%,优选0.1~1.0mol%。
5.根据权利要求1-4中任一项所述的方法,其特征在于,所述钌金属前体选自RuCl3、Ru(acac)3、[Ru(COD)Cl2]、[Ru(COD)Cl2]、[Ru(NBD)Cl2]中的一种或多种,优选[Ru(COD)Cl2]。
6.根据权利要求1-5中任一项所述的方法,其特征在于,所述配体选自双膦配体、亚膦酸配体、亚膦酰胺、氮膦配体中的一种或多种,如双二苯基膦甲烷(dppm)、1,2-双二苯基膦乙烷(dppe)、1,3-双二苯基膦丙烷(dppp)、1,4-双二苯基膦丁烷(dppb)、1,1’-双二苯基膦二茂铁(dppf)、1,1’-联萘-2,2’-双二苯基膦(BINAP)、4,5-双二苯基膦-9,9-二甲氧基氧杂蒽(XantPhos)中的一种或多种,优选dppf作为配体。
7.根据权利要求1-6中任一项所述的方法,其特征在于,所述毒化剂选自吡啶、吡嗪、喹啉、喹喔啉以及取代的吡啶、吡嗪、喹啉、喹喔啉中的一种或多种,毒化剂用量为α,γ-不饱和二烯酮摩尔量的1.0~10.0mol%,优选2.0~5.0mol%。
8.根据权利要求1-7中任一项所述的方法,其特征在于,所述选择性氢化反应在极性溶剂中进行;溶剂用量为α,γ-不饱和二烯酮质量的2.0~5.0倍,优选2.5~3.0倍;优选极性溶剂选自甲醇、乙醇、丙醇、异丙醇、丁醇、三氟乙醇、四氢呋喃、丙酮中的一种或多种,更优选乙醇。
9.根据权利要求1-8中任一项所述的方法,其特征在于,所述选择性氢化反应的反应温度为20~60℃,优选30~40℃,和/或,反应压力为2.0~4.0MPa(表压),反应时间1~3小时。
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