An intriguing effect of electronegative 2,6-substituents on the stereochemical outcome of (S) -proline-catalyzed aldol reactions between benzaldehyde derivatives and acetone is reported. Remarkably high enantioselectivities can be achieved with such substrates.
据报道,带负电的 2,6-取代基对 (S)-脯
氨酸催化的
苯甲醛衍
生物和
丙酮之间的羟醛反应的立体
化学结果产生了有趣的影响。使用此类底物可以实现非常高的对映选择性。