Catalytic Enantioselective Dieckmann-Type Annulation: Synthesis of Pyrrolidines with Quaternary Stereogenic Centers
作者:Jonathan D. Hargrave、Joseph C. Allen、Gabriele Kociok-Köhn、Gerwyn Bish、Christopher G. Frost
DOI:10.1002/anie.200907067
日期:2010.3.1
A new trick for an old dog: A Dieckmann‐type cyclization was used to synthesize the title compounds with up to 96 % ee (see scheme; Bn=benzyl). The presence of a β coordinating functionality in the substrate induces a competition between cyclization and elimination pathways that is influenced by the nature of the chiral ligand. A mechanistic rationale is proposed to account for these observations.