Regioisomeric preferences in the orthomanganation of meta-substituted acetophenones and isopropyl benzoates, and application of iodo-demanganation with iodine chloride to the synthesis of 2-iodo-3-O-substituted and other ortho-iodo arylcarbonyl compounds
作者:Janine M Cooney、Louis H.P Gommans、Lyndsay Main、Brian K Nicholson
DOI:10.1016/s0022-328x(01)01174-3
日期:2001.9
α-iodination, some with iodine in crowded positions (2′-iodo-3′-methoxy-, -3′,4′-methylenedioxy- and -3′,4′,5′-trimethoxy-acetophenone), others with O-protected 2′-hydroxy groups (2′-benzyloxy- and 2′-t-butyldimethylsilyloxy-3′,4′-dimethoxy-6′-iodobenzene and 2′-t-butyldimethylsiloxy-6′-iodobenzene). Potential general synthetic routes to derivatives of 2-iodo-3-hydroxy-, 2-iodo-3,4-dihydroxy-, and 2
据报道合成了芳基酮(2-氯噻吨酮-9-one和3',4'-亚甲基二氧基苯乙酮)和酯(异丙基3-甲氧基-和3-乙酰氧基-苯甲酸酯)的区域异构体邻-[Mn(CO)4 ]衍生物。以及4-甲氧基-甲基和3,5-二甲氧基-苯甲酸甲酯的单一邻-[Mn(CO)4 ]产物。影响meta中邻位C orO的拥挤位置对锰偏爱的因素考虑了取代的芳基酮和酯。最低能量的金属羰基拉伸模式的频率在区域异构体的结构分配中很有用。通过碘氯化物反应取代相应的正锰3- O-取代的拥挤2位上的Mn(CO)4基团,可得到2-碘-3-甲氧基-异丙基和2-碘-3-乙酰氧基-苯甲酸异丙酯苯甲酸酯。同样制备邻位-碘苯乙酮,没有α-碘化,有些在拥挤的位置带有碘(2'-碘-3'-甲氧基-,-3',4'-亚甲基二氧基-和-3',4',5'-三甲氧基-苯乙酮),其他带有O保护的2'-羟基(2'-苄氧基和2'- t-丁基二甲基甲硅烷氧基-3',4'-