Chiral phosphine-catalyzed asymmetric [4 + 1] annulation of polar dienes with allylic derivatives: Enantioselective synthesis of substituted cyclopentenes
作者:Hanyuan Li、Zhengjie He
DOI:10.1016/j.tetlet.2021.152863
日期:2021.3
A chiral phosphine-catalyzed asymmetric [4 + 1] annulation reaction of polar 1,3-dienes and allylic derivatives is reported. Under the catalysis of P-chiral bicyclic phosphine (15 mol%), a series of 1,1-dicyano-2,4-diaryl-1,3-dienes (21 examples) readily undergo stereoselective [4 + 1] annulation reactions with allylic acetate under mild conditions, delivering enantio-enriched polysubstituted cyclopentenes
报道了极性1,3-二烯和烯丙基衍生物的手性膦催化的不对称[4 +1]环化反应。在P-手性双环膦(15 mol%)的催化下,一系列1,1,1-二氰基-2,4-二芳基-1,3-二烯(21个实例)容易进行立体选择[4 +1]环合反应,烯丙基酯在温和的条件下,提供对映体在49-89%的产率和51-98%ee的富集的取代的环戊烯。还讨论了该反应的合理机理。