Homo‐ and cross‐[4+2] cycloadditions of 2‐alkenylindoles, catalyzed by cationic halogen‐bonddonors, were developed. Under mild reaction conditions, 3‐indolyl‐substituted tetrahydrocarbazole derivatives were obtained in good to excellent yields. Experimental and quantum calculation studies revealed that the electrophilic activation of 2‐alkenylindoles was achieved by C−I⋅⋅⋅π halogen bonds.
Convenient Synthesis of Tetrahydro-γ-carbolines and Tetrahydroquinolines through a Chemo- and Regioselectivity Switch by a Brønsted Acid Catalyzed, One-Pot, Multicomponent Reaction
An efficient, one-pot, multicomponentreaction of aldehydes 1, p-methoxyaniline (2a), and 2-vinylindoles 3 was developed. This approach provides a practical approach to synthetically and biologically significant tetrahydro-γ-carboline and tetrahydroquinoline derivatives in good yields through a chemo- and regioselectivity switch, which can be tuned by simply changing the substituent on the indole component
Asymmetric Friedel–Crafts-Type Reaction of 2-Vinylindoles to <i>N</i>-Boc Imines Using a Chiral Imidazolidine-Containing NCN-Pincer Pd Catalyst
作者:Tomoya Yokota、Hyuma Masu、Takayoshi Arai
DOI:10.1021/acs.joc.2c02911
日期:——
A chiral imidazolidine-containing NCN-pincer Pd-OTf complex (NCN-Pd cat) promoted the asymmetric nucleophilicaddition of unprotected 2-vinylindoles to N-Boc imines in a Friedel–Crafts-type manner. The chiral (2-vinyl-1H-indol-3-yl)methanamine products become nice platforms for constructing multiple ring systems.