realized via tandem reduction and rearrangement. Using TMSOK as the catalyst and (EtO)2MeSiH as the reductant, a series of cyclic imides containing different functional groups were reduced to the corresponding 3-aryl isoquinolines in moderate to good yields. The scenario of the reaction pathway was supposed to involve the reduction of imides to ω-hydroxylactams, which underwent rearrangement in the presence
A firstexample of simple and efficient hydrophilic Pd-phosphine complexes catalyzed one-pot three-component reaction of ortho-bromo aldehydes, terminal alkynes and ammonium acetate proceeds through the tandem coupling-imination-annulation path for the synthesis of substituted isoquinolines, furopyridines and thienopyridines in good to excellent yields in green aqueousmedium at mild temperature was
A novel and sustainable route for the synthesis of isoquinoline was developed by reacting 2-ethynylbenzaldehyde with ammonium hydroxide in water. This method provides a convenient, atom-economical, and catalyst-free access to diversely substituted isoquinolines with moderate to good yields.
Silver Nitrate Mediated Cyclization/N–N Bond-Cleavage Reaction for the Synthesis of 3-Arylisoquinolines
作者:Yun-Hui Zhao、Yubo Li、Mingjian Luo、Zilong Tang、Keqin Deng
DOI:10.1055/s-0035-1562609
日期:——
An unprecedented silvernitrate mediated novel transformation of aromatic hydrazones into various isoquinolines has been developed. This method involves a silvernitrate promoted cyclization of aromatic hydrazones followed by N–N bond cleavage, and has wide substrate scope under mild conditions.
An operationally simple approach for the tandemsynthesis of isoquinolines by the reaction of o‐alkynylaldehydes with ammonium bicarbonate via Ag‐catalyzed 6‐endo‐dig ring closure is described. The reaction conditions and the scope of the reaction are examined, and a variety of substituted isoquinolines are prepared in moderate to excellent yields.