Oligosubstituted Pyrroles Directly from Substituted Methyl Isocyanides and Acetylenes
作者:Alexander V. Lygin、Oleg V. Larionov、Vadim S. Korotkov、Armin de Meijere
DOI:10.1002/chem.200801395
日期:2009.1
methyl isocyanides 1 onto the triple bond of electron‐deficient acetylenes 2 represents a direct and convenient approach to oligosubstituted pyrroles 3. The scope and limitations of this reaction (24 examples, 25–97 % yield) are reported along with an optimization of the reaction conditions and a rationalization of the mechanism. In addition, a related newly developed CuI‐mediated synthesis of 2,3‐disubstituted
Highly Regio- and Enantioselective Synthesis of Polysubstituted 2<i>H</i>-Pyrroles via Pd-Catalyzed Intermolecular Asymmetric Allylic Dearomatization of Pyrroles
作者:Chun-Xiang Zhuo、Yong Zhou、Shu-Li You
DOI:10.1021/ja5028138
日期:2014.5.7
A highly efficient synthesis of chiral polysubstituted 2H-pyrrole derivatives via a Pd-catalyzed intermolecularasymmetricallylic dearomatization reaction of pyrroles is presented. With the commercially available palladium precursor and chiral ligand, the polysubstituted 2H-pyrrole products containing a chiral quaternary carbon center were obtained with up to 97% ee and >95/5 regioselectivity.
Synthesis of Pyrroles by Click Reaction: Silver-Catalyzed Cycloaddition of Terminal Alkynes with Isocyanides
作者:Meng Gao、Chuan He、Hongyi Chen、Ruopeng Bai、Ben Cheng、Aiwen Lei
DOI:10.1002/anie.201302604
日期:2013.7.1
Just click with silver: Pyrroles are prepared by the co‐cyclization of terminal alkynes and isocyanides in a silver‐catalyzed click reaction. This route represents an extremely simple, efficient, and atom‐economic approach to substituted pyrroles in good yields with high selectivity, thus complementing the click method for the rapid formation of multifunctional heterocycles.
One-pot synthesis of benzotripyrrole derivatives from 1<i>H</i>-pyrroles
作者:Obaiah Pandeeti、Sathish Kumar Bijigiri、Pradeepta K. Panda
DOI:10.1039/c9nj04700j
日期:——
and characterized the isolated intermediate compounds to elucidate the mechanism. Further, computational studies were performed to probe the dual descriptor and aromaticity to understand the reactivity of the pyrrole derivatives towards cyclization and the stability of the benzotripyrrole.