Continuous flow synthesis of amines from the cascade reactions of nitriles and carbonyl-containing compounds promoted by Pt-modified titania catalysts
作者:Cevher Altuğ、Mario J. Muñoz-Batista、Daily Rodríguez-Padrón、Alina M. Balu、Antonio A. Romero、Rafael Luque
DOI:10.1039/c8gc03037e
日期:——
applied in several continuous flow reactions between nitriles and carbonyl containing compounds for amine preparation. Remarkably, conversion of levulinic acid, a biomass derived molecule, was achieved with outstanding conversion (87%) and selectivity (80%) to 1-ethyl-5-methylpyrrolidin-2-one. The catalytic system demonstrated a high stability through 120 min of reaction. Moreover, the effect of the nitrile
活性和稳定催化体系的有效设计是通过对铂含量低的商业二氧化钛进行简单修改而实现的。通过XRD,XPS,N 2吸附-解吸测量,ICP-MS,TEM和SEM分析充分表征了所制备的材料。这样的技术证实了Pt成功地掺入到二氧化钛表面上,而不影响其原始结构,形态和化学性质。所得的TiO 2-Pt催化剂有效地用于腈与含羰基化合物之间的多次连续流动反应中,以制备胺。值得注意的是,乙酰丙酸(一种生物质衍生的分子)以优异的转化率(87%)和选择性(80%)转化为1-乙基-5-甲基吡咯烷酮-2-酮。催化体系在120分钟的反应过程中显示出很高的稳定性。此外,通过与苄腈和氰基乙酸乙酯反应来研究腈的作用。还对苯甲醛的转化率进行了TiO 2 -Pt催化剂的测试,显示出显着的结果。使用对硝基苯甲醛和对氯苯甲醛研究了芳香环中取代基的影响。