Asymmetric synthesis of orthogonally protected trans-cyclopropane γ-amino acids via intramolecular ring closure
作者:David J. Fox、Daniel Sejer Pedersen、Stuart Warren
DOI:10.1039/b606879k
日期:——
enantiomerically-enriched trans-cyclopropane amino- and hydroxy-acids can be achieved by intramolecular ring closure in moderate to good yields. The optically activecyclopropane precursors are easilyprepared in a short sequence from inexpensive, commercially available olefins and tert-butyl acetate. Several leaving groups and bases were compared for the cyclopropanation step, showing that the diphenylphosphinate and