has been achieved using tertiaryamines as both methylene (-CH2-) transfer and arylmethylation agents and K2S2O8 as a convenient oxidant. The key feature of this protocol is the utilisation of K2S2O8 as an inexpensive and easy to handle radical surrogate that can effectively promote the reaction, leading to the formation of C(sp2)–C(sp3)–C(sp2) bonds via sp3 C–H bond oxidation in water at room temperature
Ruthenium-Catalyzed Alkylation of Indoles with Tertiary Amines by Oxidation of a sp<sup>3</sup>CH Bond and Lewis Acid Catalysis
作者:Ming-Zhong Wang、Cong-Ying Zhou、Man-Kin Wong、Chi-Ming Che
DOI:10.1002/chem.200902387
日期:2010.5.17
catalysts for directC‐3 alkylation of indoles, giving the desired products in high yields (up to 82 % based on 60–95 % substrate conversions). These ruthenium compounds catalyze oxidative couplingreactions of a wide variety of anilines and indoles bearing electron‐withdrawing or electron‐donating substituents with high regioselectivity when using tBuOOH as an oxidant, resulting in the alkylation of N‐arylindoles
Visible-Light-Promoted Alkylation of Indoles with Tertiary Amines by the Oxidation of a<i>sp</i><sup>3</sup>C-H Bond
作者:Xuan Ding、Chun-Lin Dong、Zhi Guan、Yan-Hong He
DOI:10.1002/adsc.201701131
日期:2018.2.15
A visible‐light driven reaction for the synthesis of 3‐arylmethyl indole derivatives using tertiary amines and indoles was first reported. Corresponding products were obtained with yields of up to 70%, and various functional groups on the indoles were well tolerated when Rose Bengal was used as a photosensitizer and air was used as a green oxidant under mild reaction conditions.