Directed Reduction of β-Amino Ketones to Syn or Anti 1,3-Amino Alcohol Derivatives
摘要:
[GRAPHICS]The reduction of beta-amino ketones with samarium(II) iodide has been investigated. Either the syn or anti 1,3-amino alcohols can be obtained as the major product due to a divergence in selectivity with different N-protecting groups.
Asymmetric List-Mannich reactions were carried out in the frozen state to afford optically active adducts in moderate-to-good chemical yields and enantiomeric excesses (ee). The frozen solution exerts critical control of ee via entropy changes, in sharp contrast to the enthalpy-driven asymmetric reactions typically observed in homogeneous solvents. This study provides new perspectives for asymmetric
Directed Reduction of <i>β</i>-Amino Ketones to Syn or Anti 1,3-Amino Alcohol Derivatives
作者:Gary E. Keck、Anh P. Truong
DOI:10.1021/ol026456y
日期:2002.9.1
[GRAPHICS]The reduction of beta-amino ketones with samarium(II) iodide has been investigated. Either the syn or anti 1,3-amino alcohols can be obtained as the major product due to a divergence in selectivity with different N-protecting groups.