Conjugate Addition of Nitroalkanes to an Acrylate Equivalent. Stereocontrol at C-α of the Nitro Group through Double Catalytic Activation
作者:Jesús M. García、Miguel A. Maestro、Mikel Oiarbide、José M. Odriozola、Jesús Razkin、Claudio Palomo
DOI:10.1021/ol901351k
日期:2009.9.3
selective direct conjugateaddition of prochiral nitroalkanes (R ≠ H) to acrylate equivalents is described. The method employs a unique Lewisacid/Brønsted base/MS ternary catalytic system and affords products with dr up to 97/3. With β-substituted (R′ ≠ H) acceptors unprecedented levels of anti/syn selectivity (≥96/4) are attained. Adducts can be transformed into enantioenriched γ-amino acids and derivatives