The Ugi reaction with 2-substituted cyclic imines. Synthesis of substituted proline and homoproline derivatives
作者:Valentine G. Nenajdenko、Anton V. Gulevich、Elizabeth S. Balenkova
DOI:10.1016/j.tet.2006.04.021
日期:2006.6
The Ugi three-component reaction with 2-substituted five-, six-, and seven-membered cyclic imines was investigated. The reaction opens a newroute to substituted proline and homoproline derivatives. It was shown that the method is efficient for the one-step preparation of seminatural dipeptides containing natural amino acid residues, and fragments of substituted proline or pipecolinic acid. The scope
The Ugi reaction with CF3-carbonyl compounds: effective synthesis of α-trifluoromethyl amino acid derivatives
作者:Anton V. Gulevich、Nikolay E. Shevchenko、Elisabeth S. Balenkova、Gerd-Volker Röschenthaler、Valentine G. Nenajdenko
DOI:10.1016/j.tet.2008.10.004
日期:2008.12
The Ugi reaction with CF3-carbonylcompounds is described in detail. The method is efficient for the multicomponent preparation of α-trifluoromethyl (Tfm) amino acids, α-Tfm containing dipeptides, and iminodicarboxylic acids. In addition, the first protected CF3-opine derivative was prepared. The scope, limitations, and stereochemistry of the approach are discussed.