Photoredox-Induced Intramolecular 1,5-H Transfer Reaction of Aryl Iodides for the Synthesis of Spirocyclic γ-Lactams
摘要:
This work develops a photocatalysis method for the synthesis of gamma-spirolactams through a tandem intramolecular 1,5-HAT reaction-cyclization process. A variety of novel gamma-spirolactams are prepared in good to excellent yields with this method. This transformation features mild reaction conditions and exceptional functional group tolerance. Additionally, gamma-terpinene is applied to this transformation as a hydrogen atom donor for the first time.
Photoredox-Induced Intramolecular 1,5-H Transfer Reaction of Aryl Iodides for the Synthesis of Spirocyclic γ-Lactams
摘要:
This work develops a photocatalysis method for the synthesis of gamma-spirolactams through a tandem intramolecular 1,5-HAT reaction-cyclization process. A variety of novel gamma-spirolactams are prepared in good to excellent yields with this method. This transformation features mild reaction conditions and exceptional functional group tolerance. Additionally, gamma-terpinene is applied to this transformation as a hydrogen atom donor for the first time.
Herein, we report an arenethiolate-catalyzed 1,5-HAT of arylhalides to obtain γ-spirolactams through a SET reduction/intramolecular 1,5-HAT/cyclization/HAT process. This protocol features metal-free conditions and a broadsubstratescope, furnishing the γ-spirolactams in moderate to excellent yields. Notably, aryl bromides, aryl chlorides and even aryl fluorides are well tolerated in this transformation