Institute of Biochemistry & Molecular Biology, School of Life Sciences, Lanzhou University, Lanzhou 730000, China.
Org Lett. 2009 Dec 17;11(24):5578-81. doi: 10.1021/ol9020942.
Generally used and highly reactive RMgBr reagents were effectively deactivated by bis[2-(N,N-dimethylamino)ethyl] ether and then were employed in the highly enantioselective addition of Grignard reagents to aldehydes. The reaction was catalyzed by the complex of commercially available (S)-BINOL and Ti(O(i-)Pr)(4) under mild conditions. Compared with the other observed Grignard reagents, alkyl Grignard reagents showed higher enantioselectivity and they achieved >99% ee.
通常使用且高反应性的 RMgBr 试剂可通过双[2-(N,N-二甲基氨基)乙基]醚有效失活,然后用于格氏试剂对醛的高对映选择性加成。该反应在温和条件下由市售的(S)-BINOL 和 Ti(O(i-)Pr)(4)的配合物催化。与其他观察到的格氏试剂相比,烷基格氏试剂表现出更高的对映选择性,达到了 >99%ee。