Preparation of Polysubstituted
Isochromanes by Addition
of <i>ortho</i>-Lithiated Aryloxiranes to Enaminones
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Abstract
The reaction of <i>ortho</i>-lithiated aryloxiranes with
various enaminones straightforwardly affords new functionalized isochromanes
as mixtures of two epimeric stereoisomers in reasonable to very good
yields (50–90%). The two diastereomers, which show a high structural
variability, can be easily separated by column chromatography