Facile ionic liquid-mediated, three-component sequential reactions for the green, regio- and diastereoselective synthesis of furocoumarins
作者:Stephen Michael Rajesh、Subbu Perumal、J. Carlos Menéndez、Sokkar Pandian、Ramachandran Murugesan
DOI:10.1016/j.tet.2012.04.058
日期:2012.7
An environmentally friendly approach to the diastereoselective synthesis of trans-4-oxo-3-aryl-3,4-dihydro-2H-furo[3,2-c]coumarin-2-carbonitriles, trans-2-benzoyl-3-(aryl)-2H-furo[3,2-c]chromen-4(3H)-ones and trans-ethyl-4-oxo-3-(aryl)-3,4-dihydro-2H-furo[3,2-c]chromene-2-carboxylates in good yields is described. The method is based on the sequential multicomponent reactions of 4-hydroxycoumarin, aromatic
反式-4-氧代-3-芳基-3,4-二氢-2 H-呋喃并[3,2 - c ]香豆素-2-腈,反式-2-苯甲酰基-3-非对映选择性合成的环保方法(芳基)-2 H-呋喃[3,2 - c ] chromen-4(3 H)-ones和反-乙基-4-氧代-3-(芳基)-3,4-二氢-2 H-呋喃[描述了高产率的3,2 - c ]亚甲基-2-羧酸酯。该方法基于4-羟基香豆素,芳香醛和原位的顺序多组分反应 在离子液体[BMIm] OH的存在下生成氰基甲基吡啶鎓,苯并吡啶基吡啶鎓/(2-乙氧基-2-氧乙基)吡啶鎓叶立德,其既起催化剂作用,又起反应介质的作用。