This invention relates to a process for preparing an alpha-arylalkanoic acid or salt thereof which comprises the rearrangement of an alpha-halo-alkylarylketal in neutral or slightly alkaline conditions, in the presence of a dipolar aprotic diluent and of a protic substance having a high dielectric constant, and the subsequent hydrolysis of the thus obtained ester.
Enantioselective Synthesis of Quinolizidines and Indolizidines via a Catalytic Asymmetric Hydrogenation Cascade
作者:Magnus Rueping、Lukas Hubener
DOI:10.1055/s-0030-1259955
日期:2011.6
A catalyticenantioselective synthesis of a new class of quinolizidines and indolizidines is presented. An asymmetric Bron-sted acid catalyzed hydrogenation cascade as well as a sequential Bronsted acid/metal catalyzed hydrogenation protocol of 2-substituted quinolines yields benzofused quinolizidines and indolizidines in good yields with high diastereo- and enantioselectivities.