Methyltrioxorhenium Catalyzed Synthesis of Dinitrones from Primary Diamines and Non-Enolizable Aldehydes
作者:Reza Najjar、Kazem D. Safa
DOI:10.2174/157017811796504873
日期:2011.9.1
Green Chemistry is the design of chemicals and processes that reduce or eliminate the use and generation of hazardous substances, and consequently reduce the risk to human health and the environment. Nitrones have various applications, such as building blocks in the synthesis of natural and biologically active compounds and molecular weight regulators in radical polymerization. In this work, dinitrones were successfully synthesized in a one-pot process from primary diamines and proper aromatic aldehydes employing methyltrioxorhenium (MTO) as catalyst and urea-hydrogen peroxide adduct (UHP) as oxidizing agent. Diamines, such as 1,6-diaminohexane and 1,12-diaminododecane were reacted with benzaldehydes bearing various substituent, such as 4-chloro, 4-nitro, 4-methoxybenzaldehyde, and also furfural. The resulting N,N' -bis (benzylidene)-1,6-hexanediamine N,N' -dioxides or N,N' -bis (benzylidene)-1,12-dodecanediamine N,N' -dioxides (or substituted benzylidenes) were separated with 45-60 % yields. The main advantage of the one-pot process is the elimination of need for several separation and purification steps and reduction in consumption of chemicals and waste production. The products selectively were characterized by 1H-NMR, 13C-NMR, FT-IR spectroscopies, and elemental analysis (CHNS).
绿色化学是指设计化学品和工艺,减少或消除有害物质的使用和产生,从而降低对人类健康和环境的风险。硝基膦有多种用途,如合成天然和生物活性化合物的构筑基块,以及自由基聚合中的分子量调节剂。在这项工作中,以甲基三氧硼酸(MTO)为催化剂,以尿素-过氧化氢加合物(UHP)为氧化剂,通过一锅法从伯胺和适当的芳香醛中成功合成了二硝基膦。1,6-二氨基己烷和 1,12-二氨基十二烷等二胺与含有不同取代基(如 4-氯、4-硝基、4-甲氧基苯甲醛和糠醛)的苯甲醛发生反应。 所得到的 N,N'-双(亚苄基)-1,6-己二胺 N,N'-二氧 化物或 N,N'-双(亚苄基)-1,12-十二烷二胺 N,N'-二氧 化物(或取代的亚苄基)的分离率为 45-60% 。单锅工艺的主要优点是省去了多个分离和纯化步骤,减少了化学品的消耗和废物的产生。通过 1H-NMR、13C-NMR、FT-IR 光谱和元素分析(CHNS)对产品进行了选择性表征。