site-selectivity switch has been achieved in the ruthenium-catalyzed C–H arylation reaction of N-acetyl-1,2-dihydroisoquinolines. This metal-mediated switch is antipodal to the previous report on the palladium-mediated C-4 C–H arylation on the same substrate. Mechanistic details reveal interesting aspects of the reaction pathway, and kinetic studies bring out the difference in the modes of C–H activation
A new approach for the functionalization of C-4 of isoquinolines is reported. The method utilizes palladium catalyzed, hetero-atom guided (or electrophilic metalation) direct arylation via regioselective CâH functionalization of dihydroisoquinolines.
Ag-catalyzed cyclization of 2-alkynylbenzylazides offers a novel and efficient method for the synthesis of substituted isoquinoline. The reaction proceeds smoothly in moderate to good yields and tolerates considerable functional groups. The reaction conditions and the scope of the process are examined, and a plausible mechanism is proposed.
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
Environmentally friendly Nafion-catalyzed synthesis of 3-substituted isoquinoline by using hexamethyldisilazane as a nitrogen source under microwave irradiation
作者:Tzu-Chun Lin、Chieh-Kai Chan、Yi-Hsiu Chung、Cheng-Chung Wang
DOI:10.1039/d3ob01032e
日期:——
synthesize 3-arylisoquinoline from 2-alkynylbenzaldehydes using Nafion® NR50 as an acidic catalyst and hexamethyldisilazane (HMDS) as a nitrogen source. The reaction proceeded via a 6-exo-dig cyclization under microwave irradiation, giving the corresponding isoquinolines in excellent yields. The advantages of this protocol include: (1) the use of recyclable acid catalysts, (2) transition-metal-free catalysis