Highly efficient oxidative annulation of alkynes furnished diversely substituted pyran[2,3,4-de]chromene-2-one derivatives and related polycycles in moderate to high yield. The reaction is catalyzed by nontoxic, air-stable, and inexpensive Cp∗Co(CO)I 2 catalyst. The hydroxyl moiety at the substrate acts as the directing group for the C-H bond activation. © 2019 American Chemical Society.

Subhabrata Sen

Chemistry

(SoNS) School of Natural Sciences

Dutta P.K.

Ravva M.K.

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Shiv Nadar University

Journal of Organic Chemistry

Angewandte Chemie International Edition

Enantioselective C(sp
            3
            )–H Amidation of Thioamides Catalyzed by a Cobalt
            III
            /Chiral Carboxylic Acid Hybrid System

Advanced Synthesis & Catalysis

Hydroxyl-Directed Rhodium-Catalyzed C−H Bond Activation and Cyclization Leading to Naphtho[1,8-bc]pyran Derivatives and its Analogues

ChemCatChem

Cobalt-Catalyzed Annulation Reactions via C−H Bond Activation

Catalysis Science & Technology

Cobalt-catalyzed C–H activation: recent progress in heterocyclic chemistry

Chemistry - A European Journal

Cp*CoIII
-Catalyzed Bis-isoquinolone Synthesis by C−H Annulation of Arylamide with 1,3-Diyne

Cobalt-Catalyzed, Hydroxyl-Assisted C-H Bond Functionalization: Access to Diversely Substituted Polycyclic Pyrans