MICROWAVE INDUCED SINGLE STEP GREEN SYNTHESIS OF SOME NOVEL 2-ARYL ALDEHYDES AND THEIR ANALOGUES
申请人:Sinha Arun Kumar
公开号:US20120041234A1
公开(公告)日:2012-02-16
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2,2-二芳基醛类及类似物的过程,这些中间体是商业上重要的非类固醇抗炎药物(包括萘普生、氟比洛芬等)和潜在的抗癌药物候选药物(包括苯斯他汀)的特权中间体,通过一种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,如水和二甲基亚砜或二恶烷的混合物,以及试剂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)进行反应,反应时间从1分钟至30分钟不等,取决于微波或传统加热,无需使用昂贵的过渡金属催化剂或路易斯酸碱,收率在35-55%之间变化,取决于所使用的溶剂和底物。该方法提供了一种干净、方便的替代方案,可访问各种重要的药用2-芳基和2,2-二芳基醛基骨架,而不是采用传统的多步协议,这些多步协议使用昂贵和危险的过渡金属催化剂和路易斯酸碱。