Tri- and tetrasubstituted N–H pyrroles were prepared by the simple treatment of vinyl azides with 1,3-dicarbonylcompounds in toluene at 100 °C via 2H-azirine intermediates generated in situ. When the reactions of vinyl azides and 1,3-dicarbonylcompounds were performed in DMF in the presence of a catalytic amount of K2CO3, 1-vinyl-1,2,3-triazoles were obtained via 1,3-dipolar cycloaddition. These
三-和四取代Ñ经由2在100℃下在甲苯中的简单处理乙烯基叠氮化物与1,3-二羰基化合物制备-H吡咯ħ原位产生-azirine中间体。当在催化量的K 2 CO 3存在下,叠氮化乙烯和1,3-二羰基化合物的反应在DMF中进行时,通过1,3-偶极环加成反应获得1-乙烯基-1,2,3-三唑。这些方法利用了叠氮化乙烯基化学反应的正交模式,这可以通过稍微改变反应条件来实现。
Synthesis of Polysubstituted <i>N</i>-H Pyrroles from Vinyl Azides and 1,3-Dicarbonyl Compounds
pyrrole formation by the reaction of vinylazides with 1,3-dicarbonyl compounds via the 1,2-addition of 1,3-dicarbonyl compounds to 2H-azirine intermediates generated in situ from vinylazides; (ii) the Cu(II)-catalyzed synthesis of pyrroles from alpha-ethoxycarbonyl vinylazides and ethyl acetoacetate through the 1,4-addition reaction of the acetoacetate to the vinylazides. By applying these two methods
Copper-catalyzed C–H/N–H annulation of enaminones and alkynyl esters for densely substituted pyrrole synthesis
作者:Leiqing Fu、Jie-Ping Wan、Liyun Zhou、Yunyun Liu
DOI:10.1039/d1cc06768k
日期:——
copper-catalyzed annulation of enaminones with alkynyl esters for the facilesynthesis of different pyrroles with a 2,3,4,5-tetrasubstituted structure has been developed. With Cu(OAc)2 as the only catalyst, the tunable synthesis of 2-vinyl and 2,3-dicarboxyl-functionalized pyrroles has been achieved by using terminal and internal alkynyl esters, respectively. The synthesis of 2-vinyl pyrroles represents the first