Asymmetric 1,3-Dipolar Cycloaddition of N-Metalated Azomethine Ylides to Methyl (<i>S</i>)-2-(<i>p</i>-Tolylsulfinyl)acrylate. Synthesis of Optically Pure 2,4,5-Trisubstituted 2,5-Dihydro-1<i>H</i>-pyrroles
作者:José Luis García Ruano、Amelia Tito、M. Teresa Peromingo
DOI:10.1021/jo010797s
日期:2002.2.1
The first 1,3-dipolar reaction of azomethine ylides with opticallypure vinyl sulfoxide are reported. The presence of the sulfinyl group increase the reactivity of the acrylate moiety as a dipolarophile, and the reactions evolve with complete regio- and endo-selectivities. Nevertheless, mixtures of the two diastereoisomers 4 and 5 (75-88% de) resulting from the anti dipole/s-cis dipolarophile and syn