External‐Photocatalyst‐Free Visible‐Light‐Mediated Synthesis of Indolizines
作者:Basudev Sahoo、Matthew N. Hopkinson、Frank Glorius
DOI:10.1002/anie.201506868
日期:2015.12.14
A visible‐light‐mediatedsynthesis of valuable polycyclic indolizine heterocycles from easily accessed brominated pyridine and enol carbamate derivatives has been developed. This process, which operates at room temperature under irradiation from readily available light sources, does not require the addition of an external photocatalyst. Instead, an investigation into the reaction mechanism indicates
Desulfitative palladium-catalyzed direct C-3 arylation of indolizines with arylsulfonyl chlorides
作者:Wei Zhang、Fang Liu、Baoli Zhao
DOI:10.1002/aoc.3326
日期:2015.8
Pd‐catalyzed desulfitative approach to C‐3 arylation of indolizine derivatives has been developed, and the protocol uses readily available arylsulfonylchlorides as the arylation reagent under nitrogen. This transformation was performed in a mixed solvent of 1‐methyl‐2‐pyrrolidone and dimethoxyethane using simple triphenylphosphine as a ligand, which provides a new method for the C‐3 arylation of indolizines
An I<sub>2</sub>-catalyzed oxidative cyclization for the synthesis of indolizines from aromatic/aliphatic olefins and α-picoline derivatives
作者:Likui Xiang、Fuming Zhang、Baohua Chen、Xiaobo Pang、Xiaodong Yang、Guosheng Huang、Rulong Yan
DOI:10.1039/c5ra01234a
日期:——
A novel I2-catalyzed intermolecular oxidative tandem cyclization reaction of aromatic/aliphatic olefins and α-picoline derivatives has been achieved for the synthesis of indolizines under metal-free conditions. In this transformation, substituted indolizines are obtained in moderate to good yields through C–C/C–N bond formation in one pot.
Development and Cycloaddition Reactivity of a New Class of Pyridine-Based Mesoionic 1,3-Dipole
作者:Huseyin Erguven、David C. Leitch、Evan N. Keyzer、Bruce A. Arndtsen
DOI:10.1002/anie.201609726
日期:2017.5.22
structural characterization of a new type of mesoionic 1,3-dipole, which can be generated in the one-step reaction of imines with pyridine- or quinoline-based acid chlorides. Coupling the formation of these dipoles with alkyne cycloaddition can open a general and modular route to synthesize indolizines from combinations of available and diversifiable building blocks.
Iodine-Promoted Synthesis of 3-Arylindolizine-1-Carboxylates from 2-(2-Nitro-1-Arylethyl)Malonates and Pyridine
作者:Yun Li、Zhengquan Zhou、Weijian Ye、Juanjuan Liu、Juan Yao、Cunde Wang
DOI:10.3184/174751913x13737205567934
日期:2013.9
An efficient and straightforward one-pot synthetic protocol has been developed for the synthesis of 3-arylindolizine-1-carboxylates via 1,3-dipolar annulation of 2-(2-nitro-1-arylethyl)malonates with pyridine and subsequent aromatisation in the presence of molecular iodine. The structure of methyl 3-(4-methoxyphenyl)indolizine-1-carboxylate (2a) and methyl 3-iodo-2-(4-nitrophenyl)indolizine-1-carboxylate