Rationally-Designed<i>S-</i>Chiral Bissulfinamides as Highly Enantioselective Organocatalysts for Reduction of Ketimines
作者:Dong Pei、Yu Zhang、Siyu Wei、Meng Wang、Jian Sun
DOI:10.1002/adsc.200700504
日期:2008.3.7
example of S-chiral organocatalysts, that are highly efficient and enantioselective in substoichometric amounts, and which use a chiral monosulfinamide group as Lewis base to activate trichlorosilane (HSiCl3) to reduce N-arylketimines. A plausible mechanism involving two molecules of the monosulfinamde catalyst for the activation of HSiCl3 prompted us to design S-chiral bissulfinamides as new catalysts
我们最近报道了S-手性有机催化剂的第一个例子,它在亚化学计量的量上是高效和对映选择性的,并且使用手性单亚磺酰胺基作为Lewis碱来激活三氯硅烷(HSiCl 3)来还原N-芳基酮亚胺。涉及两个分子的单亚磺酰胺催化剂激活HSiCl 3的合理机制促使我们设计将S-手性双亚磺酰胺用作新催化剂。我们在这里描述我们的发现,即容易制备的S带有5-亚甲基键的-手性双亚磺酰胺不仅继承了单亚磺酰胺催化剂的优良底物通用性,而且还表现出进一步提高的对映选择性。