Enantioselective Acylphosphonylation—Dual Lewis Acid–Lewis Base Activation of Aldehyde and Acylphosphonate
作者:Ye-Qian Wen、Robin Hertzberg、Christina Moberg
DOI:10.1021/jo500895u
日期:2014.7.3
obtained by a one-step procedure consisting of reaction of diethyl acetylphosphonate with prochiral aldehydes in the presence of a catalytic system comprising a chiral Lewis acid, an achiral Lewis base, and a Brønstedt base. Best results were obtained using a tridentate Schiff base aluminum(III) Lewis acidic complex, 1H-1,2,3-benzotriazole, and a tertiary amine such as DBU. The target compounds were
乙酰氧基膦酸酯是通过一步法获得的,该过程由乙酰膦酸二乙酯与前手性醛在包含手性路易斯酸,非手性路易斯碱和布朗斯台德碱的催化体系的存在下反应组成。使用三齿Schiff碱铝(III)Lewis酸性配合物,1 H -1,2,3-苯并三唑和叔胺(例如DBU )可获得最佳结果。在大多数情况下,以高收率获得目标化合物,但对映体比例适中(最高78:22)。