Microwave induced single step green synthesis of some novel 2-aryl aldehydes and their analogues
申请人:Sinha Arun Kumar
公开号:US08779200B2
公开(公告)日:2014-07-15
The present invention provides a process for the preparation of some novel 2-aryl and 2,2-diaryl aldehydes and analogues which are privileged intermediates for commercially important nonsteroidal anti-inflammatory drugs including naproxen, flurbiprofen and potent anticancer drug candidates, including phenstatin through a unique single step synthetic methodology utilizing easily available substrates in the form of aryl alkenes as well as environmentally benign aqueous reaction conditions in the form of solvents such as mixtures of water and DMSO or Dioxane and reagents N-bromosuccinimide, N-iodosuccinimide, N-cholorosuccinimide and phase transfer catalyst such as cetyltrimethyl ammonium bromide, N-hexyl ammonium chloride for a reaction time varying from 1 min-30 min, depending upon microwave or conventional heating, without using expensive transition metal catalysts or lewis acids/bases with yield varying from 35-55%, depending upon the solvent and substrate used. The developed method provides a clean and convenient alternative to access a diverse range of medicinally important 2-aryl and 2,2-diaryl aldehyde based scaffolds in lieu of the conventional multistep protocols employing expensive and hazardous transition metal catalysts and lewis acids/bases.
本发明提供了一种制备一些新型2-芳基和2,2-二芳基醛和类似物的方法,这些醛和类似物是商业上重要的非甾体抗炎药物(包括萘普生、氟比洛芬和强效抗癌药物候选剂,包括苯丙替因)的特权中间体,通过独特的单步合成方法,利用易得的芳基烯烃底物以及环境友好的水相反应条件(如水和DMSO或Dioxane的混合物)和试剂N-溴代琥珀酰亚胺、N-碘代琥珀酰亚胺、N-氯代琥珀酰亚胺和相转移催化剂(如溴化十六烷基三甲基铵、N-己基氯化铵),反应时间为1分钟至30分钟,取决于微波或传统加热,不使用昂贵的过渡金属催化剂或路易斯酸/碱,产率为35-55%,取决于所使用的溶剂和底物。所开发的方法提供了一种清洁和便捷的替代方法,以获得多种重要的2-芳基和2,2-二芳基醛基支架,而不是使用昂贵和危险的过渡金属催化剂和路易斯酸/碱的传统多步协议。