1,3-Dipolar cycloaddition of C-(2-thiazolyl)nitrones to chiral acrylates. Synthesis of enantiopure α-amino-2-alkylthiazoles and 5-formylpyrrolidin-2-ones
作者:Tomas Tejero、Alessandro Dondoni、Isabel Rojo、Francisco L Merchán、Pedro Merino
DOI:10.1016/s0040-4020(97)00040-9
日期:1997.3
The 1,3-dipolar cycloaddition of thiazolyl nitrones with chiral acrylates has been studied. The use of the Oppolzer'scamphorsultam as chiral inductor provided isoxazolidines with excellent regio- and diastereoselectivities and good asymmetric induction. The cycloadducts were converted into homochiral α-amino-2-alkylthiazoles and 5-(2-thiazolyl)-3-hydroxy-2-pyrrolidinones. The latter compounds were