Chiral diethyl (2R)-tetrahydropyrro-2-ylphosphonate is an effective catalyst for the Michael addition of nitroalkanes to alpha,beta-unsaturated ketones. This Study revealed that the hydrate salt of this alpha-aminophosphonate was found to be a better catalytic species. Moderate to high enantioselectivities were achieved in reactions that tolerate various nitroalkanes and enones in the presence of low loading of both catalyst ( 10 mol %) and bulk base (25 mol %). (C) 2008 Published by Elsevier Ltd.
The Reaction of Nitroparaffins and Alicyclic Ketones. II
作者:Dorothy V. Nightingale、Floyd B. Erickson、James M. Shackelford
DOI:10.1021/jo50007a015
日期:1952.7
Arginine- or Lysine-catalyzed Michael Addition of Nitromethane to α,β-Unsaturated Ketones in Aqueous Media
作者:Seongsoon Park
DOI:10.5012/bkcs.2014.35.12.3671
日期:2014.12.20
acids can catalyze numerous reactions including the aldol reaction, the Mannich reaction, an α-amination, an α-aminoxylation, the Diels Alder reaction, and an asymmetric conjugate addition. Besides, the salts of proline or modified amino acids exhibit catalytic activities towards Michael addition of nitroalkanes to enones or enals. The products of Michael addition of nitroalkanes provide a variety of key