A room-temperature protocol to access isoquinolines through Ag(i) catalysed annulation of o-(1-alkynyl)arylaldehydes and ketones with NH4OAc: elaboration to berberine and palmatine
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
Cobalt‐Mediated Decarboxylative/Desilylative C−H Activation/Annulation Reaction: An Efficient Approach to Natural Alkaloids and New Structural Analogues
A Co(II)- mediated decarboxylative/desilylative C−H activation/annulation reaction for the synthesis of 3-arylisoquinoline derivatives has been developed with a good functional group tolerance and wide applications.
One-pot synthesis of isoquinoline and related compounds via Cu-mediated tandem cross-coupling and cyclization
作者:Shubhendu Dhara、Raju Singha、Yasin Nuree、Jayanta K. Ray
DOI:10.1016/j.tetlet.2013.11.088
日期:2014.1
One-pot synthetic strategy has been developed to access isoquinolines and its analogs via Cu-mediated tandem cross-coupling and cyclization in good yields under mild reaction conditions. A mixture of suitably substituted α-bromoaldehyde, terminal alkyne, and aq NH3 in CuI/1,10-phenanathroline catalytic system afforded the 3-substituted isoquinoline regio-selectively in good to excellent yields.
An Efficient Synthesis of 3-Substituted Isoquinoline and Pyridine Derivatives by Gold Catalyzed Intramolecular Cyclization from<i>o</i>-Alkynyloximes
作者:K. P. V. Subbarao、G. Raveendra Reddy、A. Muralikrishna、K. V. Reddy
DOI:10.1002/jhet.2109
日期:2014.7
A one‐pot reaction was developed efficiently by AuCl3 catalyzed intramolecularcyclization of aromatic o‐alkynyloximes and 2‐alkynylcycloalkene‐1‐carbaldoximes leading to the formation of isoquinoline and pyridine derivatives with high yields. This methodology has been applied for aromatic as well as aliphatic systems. Aromatic o‐alkynyloximes are benzene and naphthalene, whereas electron‐donating
Copper-Catalyzed Domino Three-Component Benzannulation: Access to Isoquinolines
作者:Peng Ma、Yuhang Wang、Jianhui Wang
DOI:10.1021/acs.organomet.2c00195
日期:2022.8.22
We report herein the synthesis of isoquinolines through a copper(I)-catalyzed domino reaction. During this transformation, three molecules of terminal alkynes, 2-bromoaryl aldehydes (ketones), and acetamide react together, in a sequence including Sonogashira coupling, condensation, 6-endo-dig cyclization, elimination of acetic acid, and hydrolysis. In this reaction, isoquinolines with broad functional