amino acids are valuable targets but methods for the stereoselective α-selenation of simple amino acid precursors are rare. We herein report the enantioselective electrophilic α-selenation of azlactones (masked α-amino acidderivatives) and isoxazolidin-5-ones (masked β-amino acids) using Cinchona alkaloids as easily accessible organocatalysts. A variety of differently substituted derivatives was accessed
Synthesis of 3,3-disubstituted oxindoles by organoselenium-induced radical cyclizations of <i> N</i>-arylacrylamides
作者:Wei-jun Fu、Mei Zhu、Guang-long Zou
DOI:10.1515/hc-2014-0195
日期:2015.2.1
Abstract A simple and practical approach to oxindole derivatives via organoselenium-induced radical cyclizations of N-arylacrylamides has been developed. This method provides a convenient access to a variety of selenium-containing oxindoles in good to excellent yields under relatively mild reaction conditions. As one of its notable features, the radical process allows for the direct formation of a
Organo-Selenium Induced Radical Ring-Opening Intramolecular Cyclization or Electrophilic Cyclization of 2- (Arylmethylene)cyclopropylaldehyde: A Tunable Synthesis of 1-Naphthaldehydes or 3-Oxabicyclo[3.1.0]hexan-2-ols
作者:Maozhong Miao、Xian Huang
DOI:10.1021/jo900805a
日期:2009.8.7
1-Naphthaldehydes and 3-oxabicyclo[3.1.0]hexan-2-ols can be prepared, respectively, by the intramolecular alkylation and cyclization of (E)-2-(arylmethylene)cyclopropylaldehyde 1 mediated by different organo-selenium reagents. The properties of selenium reagents may play an important role in the reactions. A rationale for these transformations is proposed.