Highly Enantioselective Vinyl Additions of Vinylaluminum to Ketones Catalyzed by a Titanium(IV) Catalyst of (<i>S</i>)-BINOL
作者:Deepak Baburao Biradar、Han-Mou Gau
DOI:10.1021/ol801999u
日期:2009.2.5
We report a novel asymmetric addition of vinyl group to ketones using vinylaluminum reagents catalyzed by in situ prepared Ti(OiPr)4 complexes of (S)-BINOL to afford diversified tertiary allylic alochols. Varieties of aromatic ketones bearing either an electron-donating or an electron-withdrawing substituent on the aromatic ring were examined to afford products in excellent enantioselectivities of
我们报告了使用乙烯基铝试剂通过原位制备的(S)-BINOL的Ti(O i Pr)4配合物催化的乙烯基铝试剂向乙烯基酮的新型不对称加成反应,从而提供了多种叔烯丙基醇。研究了在芳族环上带有给电子或吸电子取代基的各种芳族酮,以高收率提供了高达98%ee的优异对映选择性的产物。10倍的放大反应以相似的产率提供了可比的对映选择性的产物。更重要的是,已证明添加了各种乙烯基试剂,包括官能化的乙烯基,从而提供了具有高达96%ee的良好至优异对映选择性的叔烯丙醇。