as a powerful strategy for organometallic catalysis, and yet electrocatalytic C−Hactivation is restricted to strongly N‐coordinating directing groups. The first example of electrocatalytic C−Hactivation by weak O‐coordination is presented, in which a versatileruthenium(II) carboxylate catalyst enables electrooxidative C−H/O−H functionalization for alkyne annulations in the absence of metal oxidants;
电催化已被认为是有机金属催化的有力策略,但是电催化CH活化仅限于强N配位的导向基团。给出了通过弱O配位进行电催化C-H活化的第一个例子,其中通用的羧酸钌(II)催化剂可在没有金属氧化剂的情况下实现炔烃环化的电氧化C / H / OH功能化。从而利用可持续的电力作为唯一的氧化剂。机械学的见解为简便的有机金属CH钌钌化和关键钌(0)中间体的有效电化学再氧化提供了有力的支持。
Palladium-Catalyzed Carbonylative Reactions of 1-Bromo-2-fluorobenzenes with Various Nucleophiles: Effective Combination of Carbonylation and Nucleophilic Substitution
A systematic study on the carbonylative transformation of 1‐bromo‐2‐fluorobenzenes with various nucleophiles has been performed. Different types of double nucleophiles, such as NN, NC, OC, and NS, can be effectively applied as coupling partners. The corresponding six‐membered heterocycles were isolated in moderate to good yields.
One-Pot Sequential N-Heterocyclic Carbene/Rhodium(III) Catalysis: Synthesis of Fused Polycyclic Isocoumarins
作者:So Won Youn、Huen Ji Yoo
DOI:10.1002/adsc.201700072
日期:2017.7.3
A one‐pot sequential N‐heterocyclic carbene–rhodium (NHC‐Rh) catalysis is described, demonstrating the compatibility of NHC and Rh catalysts. N‐Heterocyclic carbene‐catalyzedaerobicoxidation of benzaldehydes and subsequent rhodium(III)‐catalyzedoxidative coupling/annulation with multiple bonds enabled the formation of two C–O bonds and one C–C bond in a single pot. This operationally easy, one‐pot
Ru-Catalyzed Decarboxylative Annulations of α-Keto Acids with Internal Alkynes: Dual Roles of COOH as Directing Group and Leaving Group
作者:Hui Tan、Hongji Li、Jiawang Wang、Lei Wang
DOI:10.1002/chem.201405715
日期:2015.1.26
Carboxylic acid serving as both directing and leavinggroup was discovered in Ru‐catalyzed decarboxylativeannulations of α‐keto acids with alkynes. The well‐established protocol showed high functional group tolerance, which provided an efficient and alternative route to the coumarone backbone.
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 benzoicacids 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