Synthesis of Functionalized Indolizines via Copper-Catalyzed Annulation of 2-Alkylazaarenes with α,β-Unsaturated Carboxylic Acids
摘要:
A novel copper-catalyzed annulation of 2-alkylazaarenes with alpha,beta-unsaturated carboxylic acids has been accomplished. This reaction featuring C-H olefination and decarboxylative amination processes provides a concise access to C-2 arylated indolizines from simple and readily available starting materials.
Donor–Acceptor–Donor NIR II Emissive Rhodindolizine Dye Synthesized by C–H Bond Functionalization
作者:Chathuranga S. L. Rathnamalala、Jacqueline N. Gayton、Austin L. Dorris、Shane A. Autry、William Meador、Nathan I. Hammer、Jared H. Delcamp、Colleen N. Scott
DOI:10.1021/acs.joc.9b01860
日期:2019.10.18
A NIR II emissive dye was synthesized by the C-H bond functionalization of 1-methyl-2-phenylindolizine with 3,6-dibromoxanthene. The rhodindolizine (RhIndz) spirolactone product was nonfluorescent; however, upon opening of the lactonering by the formation of the ethyl ester derivative, the fluorophore absorbs at 920 nm and emits at 1092 nm, which are both in the NIR II region. In addition, 4-cyanophenyl-