Synthesis of Dipeptidesvia Addition ofN-(Nitroacetyl)amino-Acid Derivatives toMichael Acceptors: Scope, Stereoselectivity, and Absolute Configuration
作者:Achamma Thomas、Sulur G. Manjunatha、Srinivasachari Rajappa
DOI:10.1002/hlca.19920750306
日期:1992.5.6
Michael addition of N-nitroacetyl derivatives 1 of proline esters using KF under phase-transfer catalysis resulted in the formation of adducts 3–9 with chemical yields ranging from 40–90% (Scheme). Stereoselectivity of up to 51% was obtained on addition of benzyl N-(nitroacetyl)-L-prolinate (1a). The absoluteconfiguration at the newly created chiral centre was established in the case of 9 by carrying