The enantioselective Pictet-Spengler reaction catalyzed by chiral binaphthol-derived Brønsted acid-assisted Lewis acids is demonstrated. The Pictet-Spengler reaction of nitrones, prepared from N b-hydroxytryptamine with aldehydes, gave the corresponding 1-substituted-2-hydroxytetrahydro-β-carbolines with up to 91% ee.
演示了由手性双
萘酚衍生的Brønsted酸辅助的
路易斯酸催化的对映选择性Pictet-Spengler反应。用醛与N-b-羟基色
氨酸制备的腈基的Pictet-Spengler反应生成了相应的1-取代-2-羟基四氢-β-咯啉,对映体过量达到91%。