b-Ketoesters Derived from Pyroglutamic Acid: New Entry to Hydroxylated Pyrrolizidinones
作者:Christine Greck、G屍aldine Le Bouc、Christine Thomassigny
DOI:10.3987/com-08-11418
日期:——
Four hydroxylated pyrrolizidinones have been obtained from β-ketoesters derived from L-pyroglutamic acid or 4-(R)-hydroxy-L-pyroglutamic acid. The asymmetric hydrogenations, in the presence of BinapRuBr 2 catalysts, of such β-ketoesters bearing pyrrolidinones proceeded with high diastereomeric excesses leaving to a complete control of the absolute configuration at the C7 hydroxylated carbon atom of