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.