The first case of diastereoselective cycloadditions of enantiopure nitrilimines in aqueous media
摘要:
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. (C) 2004 Elsevier Ltd. All rights reserved.
The first case of diastereoselective cycloadditions of enantiopure nitrilimines in aqueous media
摘要:
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. (C) 2004 Elsevier Ltd. All rights reserved.