CuBr-Catalyzed Aerobic Decarboxylative Cycloaddition for the Synthesis of Indolizines under Solvent-Free Conditions
作者:Wenhui Wang、Junwen Han、Jinwei Sun、Yun Liu
DOI:10.1021/acs.joc.6b02455
日期:2017.3.17
An efficientsynthesis of diversified indolizine derivatives was developed via CuBr-catalyzed reaction of pyridines, methyl ketones and alkenoic acids under solvent-free conditions in oxygen atmosphere. This synthesis involves cascade processes of copper-catalyzed bromination of the methyl ketone, 1,3-dipolar cycloaddition of the pyridinium ylide with the alkenoic acid, followed by oxidative decarboxylation
TEMPO‐catalyzed decarboxylation reactions for the synthesis of 1,2‐unsubstituted indolizines
作者:Yuxuan Zhang、Wenhui Wang、Jinwei Sun、Yun Liu
DOI:10.1002/jhet.3766
日期:2020.1
An efficient synthesis of 1,2‐unsubstituted indolizines was developed via 2,2,6,6‐tetramethylpiperidine‐1‐oxyl (TEMPO)–catalyzed decarboxylation reaction. A series of target products were successfully prepared with the tolerance of a variety of functional groups. This protocol features advantages such as easily available substrates, broad substituent scope, and eco‐friendly conditions.
Palladium-catalyzed direct and regioselective C–H acyloxylation of indolizines
作者:Jinwei Sun、Fuyao Wang、Yongmiao Shen、Huizhen Zhi、Hui Wu、Yun Liu
DOI:10.1039/c5ob01359c
日期:——
A direct and highly regioselective C1-acyloxylation of indolizines was developed via palladium-catalyzed C–H functionalization. In this reaction, the regioselectivity was achieved in the absence of a directing group.
regioselectively synthesized by a convenient one pot reaction of the corresponding pyridinium (quinolinium, isoquinolinium) ylide with maleic anhydride (MA) in the presence of the mild oxidant tetrakispyridinecobalt(II) dichromate (TPCD). These reactions proceed via a tandem reaction sequence of 1,3-dipolar cycloaddition of azomethine ylide with MA, anhydride hydrolysis and oxidative bisdecarboxylation
3-Acylindolizines(5a-5f)和它们的苯并类似物1-acylpyrrolo [1,2- a ] quinolines(6a - 6f)和1-acylpyrrolo [2,1- a ] isoquinolines (7a-7i)是通过区域选择性合成的相应的吡啶鎓(喹啉鎓,异喹啉鎓)内酯与马来酸酐 (嘛)在弱氧化剂存在下 四铬吡啶钴(II)重铬酸盐 (TPCD)。这些反应通过偶氮甲meth内酯与1,3,3-偶极环加成的串联反应序列进行嘛, 酐 水解和一级环加合物的氧化双脱羧,然后将二氢吲哚并咪唑脱氢芳构化。 TPCD在反应中同时用作脱羧剂和脱氢剂。这些结果表明TPCD 是用于脂肪族羧酸酯双脱羧的有前途的新试剂。