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.
§ Equal contribution Published as part of the Special Topic Ruthenium in OrganicSynthesis Abstract A unique approach to achieve regioselective C(3)–H olefination of isoquinolines under ruthenium-catalyzed conditions has been developed. The acetyl group of N-acetyl-1,2-dihydroisoquinoline acts as a directing group for this C–H olefination strategy. Removal of the acetyl directing group by a simple
This invention relates to new tetronic and tetramic acid derivatives with beta-secretase inhibitory activity of formula I:
wherein R1, R2, R3, R4, R5, R5′, R6 and R6′ are as defined hereinabove, to processes for their preparation, compositions containing said tetronic and tetramic acid derivatives and their use in the treatment and prevention of diseases modulated by an inhibitor of β-secretase, such as Alzheimer's disease.
An Ir(III)-catalyzed C(3)–H alkylation of N-acetyl-1,2-dihydroisoquinolines with diverse acceptor–acceptor diazo compounds has been achieved under a single catalytic system via metal carbene migratory insertion. Moreover, further synthetic transformations of the alkylated products such as aromatization, selective decarboxylation, and decarbonylation lead to the formation of several synthetically viable