Rhodium- and Iridium-Catalyzed Oxidative Coupling of Benzoic Acids with Alkynes via Regioselective C−H Bond Cleavage
作者:Kenji Ueura、Tetsuya Satoh、Masahiro Miura
DOI:10.1021/jo070735n
日期:2007.7.1
coupling of benzoic acids with internal alkynes effectively proceeds in the presence of [Cp*RhCl2]2 and Cu(OAc)2·H2O as catalyst and oxidant, respectively, to produce the corresponding isocoumarin derivatives. The copper salt can be reduced to a catalytic quantity under air. Interestingly, by using [Cp*IrCl2]2 in place of [Cp*RhCl2]2, the substrates undergo 1:2 coupling accompanied by decarboxylation to afford
在[Cp * RhCl 2 ] 2和Cu(OAc)2 ·H 2 O作为催化剂和氧化剂的情况下,苯甲酸与内部炔烃的氧化偶联有效地进行,以产生相应的异香豆素衍生物。铜盐可以在空气中还原成催化量。有趣的是,通过使用[Cp * IrCl 2 ] 2代替[Cp * RhCl 2 ] 2,使底物进行1:2偶合并脱羧,从而仅得到萘衍生物。在这种情况下,Ag 2 CO 3作为有效的氧化剂。