A general method for -hydroisoquinoline synthesis

New Class of Anion-Accelerated Amino-Cope Rearrangements as Gateway to Diverse Chiral Structures

We report useful new lithium-assisted asymmetric anion-accelerated amino-Cope rearrangement cascades. A strategic nitrogen atom chiral auxiliary serves three critical roles, by (1) enabling in situ assembly of the chiral 3-amino-1,5-diene precursor, (2) facilitating the rearrangement via a lithium enolate chelate, and (3) imparting its influence on consecutive inter- or intramolecular C-C or C-X bond-forming events via resulting chiral enamide intermediates or imine products. The mechanism of the amino-Cope rearrangement was explored with density functional theory. A stepwise dissociation-recombination mechanism was found to be favored. The stereochemistry of the chiral auxiliary determines the stereochemistry of the Cope product by influencing the orientation of the lithium dienolate and sulfinylimine fragments in the recombination step. These robust asymmetric anion-accelerated amino-Cope enabled cascades open the door for rapid and predictable assembly of complex chiral acyclic and cyclic nitrogen-containing motifs in one pot.

Highly selective synthesis of functionalized polyhydroisoquinoline derivatives via a three-component domino reaction

Two series of novel functionalized polyhydroisoquinoline derivatives have been synthesized via the three-component domino reaction under microwave irradiation conditions.

Organocatalytic cascade reactions: diversity-oriented synthesis for the construction of hydroisoquinoline scaffolds

The organocatalytic enantioselective synthesis of highly functionalized hydroisoquinolines by trienamine-mediated [4+2]-cycloaddition/nucleophilic ring-closing reaction cascade sequence of cyanoacrylamides with 2,4-dienals is presented.

Selective synthesis of polyfunctionalized hydroisoquinoline derivatives via a three-component domino reaction

Two series of novel polyfunctionalized hydroisoquinoline derivatives have been synthesized via a three-component domino reaction under microwave irradiation conditions.

Synthesis of isoquinuclidines from highly substituted dihydropyridines via the Diels-Alder reaction

A stereo- and regioselective Diels-Alder reaction for the synthesis of highly substituted isoquinuclidines from dihydropyridines and electron-deficient alkenes has been developed. While reactions with activated dienophiles proceed readily under thermal conditions, the use of Lewis acid additives is necessary to facilitate cycloadditions for less reactive alkenes. This procedure affords the target compounds in high yields and diastereoselectivities.