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.
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