Abstract
The diastereoselective cycloadditions of enantiopure nitrilimines 4 with ethyl acrylate were exploited in dry toluene and in aqueous sodium hydrogencarbonate as reaction media. Shorter reaction times and improved diastereoisomeric ratios of the resulting 5-ethoxycarbonyl-4,5-dihydropyrazoles 5 and 6 were observed in aqueous media.
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