作者:Sha Lou、Scott E. Schaus
DOI:10.1021/ja8018934
日期:2008.6.1
Chiral biphenols catalyze the enantioselective Petasis reaction of alkenyl boronates, secondary amines, and ethyl glyoxylate. The reaction requires the use of 15 mol % of (S)-VAPOL as the catalyst, alkenyl boronates as nucleophiles, ethyl glyoxylate as the aldehyde component, and 3 A molecular sieves as an additive. The chiral alpha-amino ester products are obtained in good yields (71-92%) and high
手性双酚催化烯基硼酸酯、仲胺和乙醛酸乙酯的对映选择性 Petasis 反应。该反应需要使用15mol%的(S)-VAPOL作为催化剂,硼酸烯基作为亲核试剂,乙醛酸乙酯作为醛组分,3A分子筛作为添加剂。以良好的产率 (71-92%) 和高对映体比率 (89:11-98:2) 获得手性 α-氨基酯产物。机理研究表明无环硼酸酯与 VAPOL 和四配位硼酸酯中间体的单配体交换。