Herein, we report that, by using chiral bicyclic bisborane catalysts, we have achieved the first highly regio-, diastereo-, and enantioselective direct asymmetric vinylogous Mannich reactions of acyclic α,β-unsaturated ketones. The strong Lewis acidity and steric bulk of the bisborane catalysts were essential for the observed high yields and selectivities.
在此,我们报道,通过使用手性双环双
硼烷催化剂,我们获得了第一个高度无环,非对映和对映选择性的不饱和α,β-不饱和酮的不对称
乙烯基类曼尼希反应。双
硼烷催化剂的强
路易斯酸度和空间位阻对于观察到的高收率和选择性至关重要。