Synthesis of <i>N</i>-Methoxy-<i>N</i>-methyl-β-enaminoketoesters: New Synthetic Precursors for the Regioselective Synthesis of Heterocyclic Compounds
作者:Tobias Persson、John Nielsen
DOI:10.1021/ol0611088
日期:2006.7.1
Weinreb amides react with the lithium or sodium acetylide of ethyl propynoate in a hitherto unexplored acyl substitution-conjugate addition sequence to furnish (E)-N-methoxy-N-methyl-beta-enaminoketoesters. This approach provides a diverse entry to densely functionalized heterocyclic compounds, including pyrazoles through regioselective cyclocondensations with hydrazines in a microwave-assisted reaction