Palladium-catalysed cyclisation of 2-substituted halogenoarenes by dehydrohalogenation
作者:D.E. Ames、A. Opalko
DOI:10.1016/s0040-4020(01)91149-4
日期:1984.1
satisfactory system being palladium(II) acetate in NN-dimethylacetamide (DMA) with sodium carbonate as base) has been examined as a route to some heterocyclic systems. Whereas dehydrogenative cyclisation processes require stoichiometric amounts of palladium(II) reagent, the present procedure involves only catalytic amounts (0.1 molar proportion, or less), of palladium compound. The preparation of dibenzofuran
已经研究了由各种钯催化剂和具有不同碱的溶剂(最普遍满意的体系是在碳酸钠为碱的NN-二甲基乙酰胺(DMA)中的乙酸钯(II))介导的环氢化卤化反应。尽管脱氢环化过程需要化学计量的钯(II)试剂,但本程序仅涉及催化量(0.1摩尔比例或更少)的钯化合物。二苯并呋喃,咔唑,芴酮,菲啶酮,6H-二苯并c,e] [l,2]噻嗪-5,5-二氧化物,6H-二苯并[b,d]吡喃和苯并呋喃并[2,3b]吡啶衍生物的制备方法为描述。3-苯甲酰胺基-2-氯吡啶环化为6-羟基苯并] [1,5]萘吡啶说明了该方法的区域特异性。