Stabilization of Transient 3-Chloroindolenines Enables Diverse Functionalization

Synthesis of C-N or C-C Spiroindolines via Rearrangement Coupling Reaction

Herein, we report a general approach to effectively construct C-N or C-C spiroindolines using tetrahydro-β-carbolines as starting materials via a rearrangement coupling reaction. This method is characterized by its operational simplicity and mild conditions. Notably, a wide range of anilines and indoles are suitable for this intermolecular coupling, yielding the corresponding C-N or C-C spiroindolines in good to excellent yields.

Ag-Catalyzed Domino Decarboxylative Alkylation/Dearomative Annulation: Entry to Fused-Pyrido[4,3-b]Indolones

Here we report the development of unprecedented silver-catalyzed intramolecular annulations of N-acrolyl-2-(3-indolyl) benzimidazoles with alkyl carboxylic acids to construct complex fused-pentacyclic alkaloid scaffolds. Divergent reactivities are noticed with altered groups at C2-indole of the substrate. The reaction proceeds through decarboxylative alkylation, followed by dearomative annulation in a domino manner with excellent diastereoselectivity. Owing to the reactivity of the tert-OH group, these aza-enriched scaffolds can be further functionalized.

Green Late-Stage Functionalization of Tryptamines

An efficient and rapid protocol for the oxidative halogenation of tryptamines with 10 % aqueous NaClO has been developed. This reaction is featured by its operational simplicity, metal-free conditions, no purification, and high yield. Notably, the resulting key intermediates are suitable for further functionalization with various nucleophiles, including amines, N-aromatic heterocycles, indoles and phenols. The overall transformation exhibits broad functional-group tolerance and is applicable to the late-stage functionalization of complex biorelevant molecules.

Synthesis of 3,3′-bisindoles via demethylenation

This work provides a mild demethylenation for the synthesis of 3,3′-bisindoles.

Direct C-H Functionalization of Tetrahydro-γ-Carbolines at α-Position

The direct C-H functionalization of tetrahydro-γ-carbolines (THγCs) at α-position has been presented. This mild and simple strategy allows coupling of THγCs with various anilines and indoles with satisfactory to excellent...

Diverse Functionalization of Tetrahydro-β-carbolines or Tetrahydro-γ-carbolines via Oxidative Coupling Rearrangement

We report herein diverse functionalization of tetrahydro-β-carbolines (THβCs) or tetrahydro-γ-carbolines (THγCs) via oxidative coupling rearrangement. The treatment of THβCs or THγCs with t-BuOOH (TBHP) afforded 3-peroxyindolenines, followed by HCl catalyzed indolation to form unexpected 2-indolyl-3-peroxyindolenines. Further rearrangement of these peroxides allows for rapid access to a skeletally diverse chemical library in good to excellent yields.

Construction of Bisindolines via Oxidative Coupling Cyclization

Herein, we report a general approach for the efficient construction of three-dimensional bisindolines via oxidative coupling cyclization in an intermolecular manner. This reaction is featured by its operational simplicity, metal-free conditions, lack of protecting group, and high selectivity. Notably, a wide range of anilines are suitable in this intermolecular cyclization, furnishing corresponding bisindolines in up to 98% yield.