Insertion of Nitriles into Zirconocene 1-aza-1,3-diene Complexes: Chemoselective Synthesis of N-H and N-Substituted Pyrroles
作者:Shasha Yu、Meijun Xiong、Xin Xie、Yuanhong Liu
DOI:10.1002/anie.201407221
日期:2014.10.20
insertion of nitriles into zirconocene‐1‐aza‐1,3‐diene complexes provides an efficient, chemoselective, and controllable synthesis of N‐H and N‐substitutedpyrroles upon acidic aqueous work‐up. The outcome of the reaction (that is, the formation of N‐H or N‐substitutedpyrroles) results from the different cyclization patterns, which depend on the relative stability and reactivity of the enamine–imine
A Highly Enantioselective Lewis Basic Organocatalyst for Reduction of <i>N</i>-Aryl Imines with Unprecedented Substrate Spectrum
作者:Zhouyu Wang、Xiaoxia Ye、Siyu Wei、Pengcheng Wu、Anjiang Zhang、Jian Sun
DOI:10.1021/ol060112g
日期:2006.3.2
L-Pipecolinic acid derived formamides have been developed as highly efficient and enantioselective Lewis basic organocatalysts for the reduction of N-aryl imines with trichlorosilane. Catalyst 4b afforded high isolated yields (up to 98%) and enantioselectivities (up to 96%) under mild conditions with an unprecedented substrate spectrum.
molecular scaffolds in bioactive molecules. We here present an operationally simple, high yielding and scalable method for regioselective 3-acylation of 2-substitutedindoles under basic conditions using functionalized acid chlorides. The method shows good tolerance to both electron-withdrawing and donating substituents on the indole scaffold and gives ready access to a variety of functionalized 3-acylindole
Pyrrole formation from a (1-azabutadiene)tricarbonyliron(0) complex
作者:Timothy N. Danks、Susan E. Thomas
DOI:10.1016/s0040-4039(00)80314-7
日期:1988.1
The (1-azabutadiene)tricarbonyliron(0) complex formed by selective complexation of the CN isomer of the stereoisomeric mixture of 1-azabutadienes 1 reacts smoothly with methyl-lithium to give the 1,2,3,5-tetra substituted pyrrole .