Relay Catalytic Branching Cascade: A Technique to Access Diverse Molecular Scaffolds
作者:Nitin T. Patil、Valmik S. Shinde、Balasubramanian Sridhar
DOI:10.1002/anie.201208738
日期:2013.2.18
Skeletal diversity: The reactions of alkynoic acids (A, common type of substrates) with various scaffold‐building agents (B) under gold catalysis produce a series of multifunctional polyheterocyclic structures (see scheme). The approach enables the preparation of compound libraries with high skeletal diversity.
A Sequential One-Pot Protocol for the Synthesis of Dihydrobenzo[6,7]indolo-[3′,4′:3,4,5]azepino[2,1-a]isoquinolines Using a Gold-Silver Combined Catalyst
A sequential one-pot protocol for the synthesis of indole-based peri-annulated polyheterocycles using trifluoroacetic acid and a gold-silver combined catalyst system is described. The reaction is thought to proceed via an imine formation-cationic pi-cyclization-alkyne activation-intramolecular hydroamination sequence to yield novel dihydrobenzo[6,7]indolo[3',4':3,4,5]azepino[2,1-a]isoquinolines in good yields.
Catalytic Asymmetric Pictet–Spengler-Type Reaction for the Synthesis of Optically Active Indolo[3,4-<i>cd</i>][1]benzazepines
作者:Dao-Juan Cheng、Hai-Bian Wu、Shi-Kai Tian
DOI:10.1021/ol202361t
日期:2011.10.21
A new strategy has been introduced to develop a catalyticasymmetric Pictet–Spengler-type reaction by replacing the aldehyde with an imine. A range of 4-(2-aminoaryl)indoles smoothly undergo the chiral phosphoric acid catalyzed asymmetric Pictet–Spengler-type reaction with imines at room temperature to give structurally diverse indolo[3,4-cd][1]benzazepines in good to excellent yields and ee.
已经引入了一种新的策略,以通过用亚胺代替醛来开发催化不对称的Pictet-Spengler型反应。一系列4-(2-氨基芳基)吲哚在室温下与亚胺平稳地进行手性磷酸催化的不对称Pictet-Spengler型反应,得到结构良好的吲哚[3,4- cd ] [1]苯并ze庚因产量和ee。
Water-Accelerated Cationic π-(7-endo) Cyclisation: Application to Indole-Based Peri-Annulated Polyheterocycles
作者:Mohammad Saifuddin、Piyush K. Agarwal、Sudhir K. Sharma、Anil K. Mandadapu、Sahaj Gupta、Vimal K. Harit、Bijoy Kundu
DOI:10.1002/ejoc.201000596
日期:2010.9
An efficient and versatile method for the synthesis of indole-based polycyclic indolo-benzazepine and its derivatives through water-acceleratedcationic π-cyclisation is described. The strategy involves condensation of arylamine moieties linked to C-4 in indole/azaindole systems with arylaldehydes in water containing catalytic amount of Bronsted acids. The C-C bond formation in water is complete within