Polymer supported magnesium anthracene: application in the synthesis of benzylic Grignard reagents
作者:Tania R. van der Ancker、Steven Harvey、Colin L. Raston
DOI:10.1016/0022-328x(95)05688-l
日期:1995.10
Reactions of polystyrene supported magnesium anthracene containing radical anion and dianion sites, 7, 7′, with benzylic chlorides or bromides, affords Grignard reagents, RMgX, in modest to high yields, in THF at −10°C to 20°C. Novel benzylic-type Grignard reagents prepared in high yield include those of 2,6-(dichloromethyl)pyridine, 2,6-(dibromomethyl)pyridine, 2,2′2″-trispyridylmethylchloride, 2
聚苯乙烯负载的含自由基阴离子和二价阴离子位点7、7'的蒽镁与苄基氯化物或溴化物的反应在-10°C至20°C的THF中以中等至高收率的方式提供了格氏试剂RMgX。高产率制备的新型苄基格氏试剂包括2,6-(二氯甲基)吡啶,2,6-(二溴甲基)吡啶,2,2'2''-三吡啶基甲基氯化物,2-甲氧基-3-甲基-1-苯甲酰氯,2,4-二甲氧基-5-甲基-1-苄基氯,3,5-二甲氧基-4-苄基氯,2,4,6-三甲氧基-3-甲基-1-苄基氯和2,5-二甲氧基苄基氯。所选的烯丙基卤化物类似地产生格氏试剂。