Highly <i>Anti</i>-Selective One-Pot Multicomponent Synthesis of Mannich-Type N-Acylated <font>β</font>-Amino Acid Derivatives by Copper or Sodium Salt Catalysis
作者:D. Bahulayan、V. S. Shinu、P. Pramitha、S. Arun、B. Sheeja
DOI:10.1080/00397911.2010.537008
日期:2012.4.15
A stereo-defined process has been developed for the synthesis of Mannich-type products using readily available copper sulfate or sodium chloride as catalyst. Good to excellent diastereoselectivity has been achieved for a broad array of substrates. The observed diastereoselectivity is explained on the basis of the steric interaction between the acyloxy group of the aldehyde carbon and the more hindered alpha-substituted enolate anion. This steric interaction helps the addition to take place through the less-hindered face to produce the anti-isomers predominantly.Supplemental materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) to view the free supplemental file.
An efficient green MCR protocol for the stereoselective synthesis of β-acetamido ketones catalyzed by Selectfluor™
An efficient, green, room temperature process for the stereoselective synthesis of beta-amido ketones employing a one-pot multi-component reaction of aromatic aldehydes, alpha-substituted or alpha-unsubstituted ketones, an acid chloride, and a nitrile in presence of catalytic amount of Selectfluor (TM) is described. The process offers advantages such as high anti-selectivity, shorter reaction time, energy efficiency, and simple work-up. (c) 2009 Elsevier Ltd. All rights reserved.
A novel highly stereoselective multi-component synthesis of N-substituted β-amino ketone derivatives using copper(II) phthalocyanine as reusable catalyst
作者:V.S. Shinu、P. Pramitha、D. Bahulayan
DOI:10.1016/j.tetlet.2011.04.016
日期:2011.6
Stereoselective synthesis of N-substituted β-amino ketone derivatives with substituents include one or two polar hetero atoms on benzene rings in many cases has been achieved by a one-pot multi-component process using copper(II) phthalocyanine as catalyst. The new process is suitable for the inclusion of a wide variety of substrates for the construction of highly functionalized Mannich-type structural