An efficient C(sp3)−H bond alkylation of tetrahydroisoquinolines and isochroman with alkylzinc reagents was demonstrated. This transformation could be readily performed under mild conditions in the absence of a heavy metal catalyst, affording a wide range of potentially biologically active compounds. In addition, this approach exhibited excellent compatibility with various sensitive functional groups
Ionic hydrogenation has not been extensively explored, but is advantageous for challenging substrates such as unsaturated intermediates. Reported here is an iridium-catalyzedhydrogenation of oxocarbenium ions to afford chiral isochromans with high enantioselectivities. A variety of functionalities are compatible with this catalytic system. In the presence of a catalytic amount of the Brønsted acid