Acid-Relayed Organocatalytic<i>exo</i>-Diels-Alder Cycloaddition of Cyclic Enones with 2-Vinyl-1<i>H</i>-indoles
作者:Ji-Wei Ren、Zhao-Fang Zhou、Jun-An Xiao、Xiao-Qing Chen、Hua Yang
DOI:10.1002/ejoc.201501619
日期:2016.3
With the aid of the hydrogen-bond relay of (S)-camphorsulfonic acid, the enantioselective exo-Diels–Alder cycloaddition of cyclic enones and 2-vinyl-1H-indoles catalyzed by prolinosulfonamide was developed. The corresponding Diels–Alder cycloadducts were readily obtained by a single recrystallization, free of column chromatography. Consequently, tetracyclic tetrahydrocarbazole ring systems with three
The Enantioselective, Organocatalyzed Diels-Alder Reaction of 2-Vinylindoles with α,β-Unsaturated Aldehydes: An Efficient Route to Functionalized Tetrahydrocarbazoles
Prolinol catalysts: A highly enantio‐ and diastereoselective prolinol‐catalyzedDiels–Alderreaction of 2‐vinylindoles and α,β‐unsaturated aldehydes is developed (see scheme). This methodology allows the development of further applications of prolinols in asymmetric synthesis. The resulting densely functionalized enantiomerically pure tetrahydrocarbazoles are useful in the total synthesis of natural
Palladium-catalyzed direct arylation of indoles with arylsulfonyl hydrazides
作者:Congrong Liu、Lianghui Ding、Guang Guo、Weiwei Liu、Fu-Lai Yang
DOI:10.1039/c5ob02569a
日期:——
A novel method to synthesise 2-arylindoles is demonstrated via directarylation of indoles with arylsulfonyl hydrazides. Under the optimized reaction conditions, the reaction well tolerates a wide variety of functional groups to afford structurally diverse 2-arylindoles in good to excellent yields at 70 °C.
Palladium/Copper Cocatalyzed Coupling Reaction of Aroyl Hydrazides with Indoles
作者:Congrong Liu、Fulai Yang
DOI:10.1002/cjoc.201600493
日期:2016.12
palladium/coppercocatalyzedcouplingreaction of indoles with simple aroyl hydrazides has been developed under aerobic conditions. A range of aroyl hydrazides underwent palladium/coppercocatalyzed oxidative arylation with indoles open to air in a 1:1 mixture of dimethyl sulfoxide and nitromethane to give structurally diverse 2‐arylindoles or 3‐arylindoles in moderate to good yields. The reaction well
Formal [4 + 2] benzannulation of 2-alkenyl indoles with aldehydes: a route to structurally diverse carbazoles and bis-carbazoles
作者:Ankush Banerjee、Avishek Guin、Shuvendu Saha、Anushree Mondal、Modhu Sudan Maji
DOI:10.1039/c8ob02875c
日期:——
Construction of structurally diverse carbazoles and bis-carbazoles by protecting-group-free formal [4 + 2]-benzannulation of 2-alkenyl indoles and aldehydes is demonstrated. The sequence of four different reactions is executed in one-pot using readily available and cheap bottle reagents as catalysts rendering this method attractive. The incorporation of inexpensive and environmentally benign molecular