19946-10-2Relevant articles and documents
Metal-free aminothiation of alkynes: Three-component tandem annulation toward indolizine thiones from 2-alkylpyridines, ynals, and elemental sulfur
Chen, Zhengwang,Liang, Pei,Xu, Fan,Deng, Zhen,Long, Lipeng,Luo, Guotian,Ye, Min
supporting information, p. 12639 - 12647 (2019/10/11)
A metal-free three-component annulation reaction for the synthesis of indolizine thiones via tandem C-C/C-N/C-S bond formation was developed. Various 2-alkylpyridines with aromatic ynals and elemental sulfur proceeded smoothly under catalyst-free conditions, and the desired products were obtained in moderate to excellent yields.
Catalyst-Free Annulation of 2-Pyridylacetates and Ynals with Molecular Oxygen: An Access to 3-Acylated Indolizines
Chen, Zhengwang,Liang, Pei,Ma, Xiaoyue,Luo, Haiqing,Xu, Guohai,Liu, Tanggao,Wen, Xiaowei,Zheng, Jing,Ye, Hui
supporting information, p. 1630 - 1639 (2019/01/26)
A catalyst and additive-free annulation of 2-pyridylacetates and ynals under molecular oxygen was the first developed, affording 3-acylated indolizines in good to excellent yields. Molecular oxygen was used as the source of the carbonyl oxygen atom in indolizines. This approach was compatible with a wide range of functional groups, and especially it has been successfully extended to unsaturated double bonds and triple bonds, which were difficult to prepare by previous methods in a single step.
A One-Pot Sonogashira Coupling and Annulation Reaction: An Efficient Route toward 4 H -Quinolizin-4-ones
Chen, Zhengwang,Liu, Tanggao,Ma, Xiaoyue,Liang, Pei,Long, Lipeng,Ye, Min
supporting information, p. 863 - 867 (2019/04/25)
An efficient one-pot Sonogashira coupling and annulation reaction affording 4 H -quinolizin-4-ones in moderate to excellent yields is described. A variety of substituted iodoarenes and 2-alkylazaarenes were well tolerated, and especially the unsaturated double and triple bonds were compatible under the standard conditions.
External-Photocatalyst-Free Visible-Light-Mediated Synthesis of Indolizines
Sahoo, Basudev,Hopkinson, Matthew N.,Glorius, Frank
supporting information, p. 15545 - 15549 (2016/01/26)
A visible-light-mediated synthesis 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 that the indolizine products themselves may be in some way involved in mediating and accelerating their own formation. Preliminary studies also show that these simple heterocyclic compounds may be capable of facilitating other visible-light-mediated transformations.
RhIII-Catalyzed C-H Activation with Pyridotriazoles: Direct Access to Fluorophores for Metal-Ion Detection
Kim, Ju Hyun,Gensch, Tobias,Zhao, Dongbing,Stegemann, Linda,Strassert, Cristian A.,Glorius, Frank
supporting information, p. 10975 - 10979 (2015/09/15)
The first C-H bond activation with pyridotriazoles as coupling partners is presented using a RhIII catalyst. The pyridotriazoles can be used as new carbene precursors in C-H activation for direct access to novel fluorescent scaffolds. These tunable fluorophores can be applied for the detection of metal ions.
Expedient synthesis of α-(2-azaheteroaryl) acetates via the addition of silyl ketene acetals to azine- N -oxides
Londregan, Allyn T.,Burford, Kristen,Conn, Edward L.,Hesp, Kevin D.
supporting information, p. 3336 - 3339 (2014/07/08)
A new and expedient synthesis of α-(2-azaheteroaryl) acetates is presented. The reaction proceeds rapidly under mild conditions via the addition of silyl ketene acetals to azine-N-oxides in the presence of the phosphonium salt PyBroP. This procedure affords diverse α-(2-azaheteroaryl) acetates which are highly desirable components/building blocks in molecules of pharmaceutical interest but are traditionally challenging to synthesize via contemporary methods. The reaction optimization and mechanism as well as a novel electronically enhanced PyBroP derivative are described.