Catalytic Asymmetric Allylation of Ketones and a Tandem Asymmetric Allylation/Diastereoselective Epoxidation of Cyclic Enones
作者:Jeung Gon Kim、Karen M. Waltz、Iliana F. Garcia、David Kwiatkowski、Patrick J. Walsh
DOI:10.1021/ja047758t
日期:2004.10.1
titanium tetraisopropoxide, BINOL, 2-propanol additive, and tetraallylstannane as allylating agent. A variety of ketone substrates, including acetophenone derivatives and alpha,beta-unsaturated cyclic enones, reacted to form tertiary homoallylic alcohols in good yields (67-99%) and with high levels of enantioselectivity (generally >80%). A novel one-pot enantioselective allylation/diastereoselective
报道了一种简单的方法用于酮的催化不对称烯丙基化,利用四异丙醇钛、BINOL、2-丙醇添加剂和四烯丙基锡烷作为烯丙基化剂。各种酮底物,包括苯乙酮衍生物和 α,β-不饱和环烯酮,以良好的产率 (67-99%) 和高水平的对映选择性 (通常 >80%) 反应形成叔均烯丙醇。还引入了一种新型的一锅对映选择性烯丙基化/非对映选择性环氧化。因此,在烯丙基与共轭环烯酮的加成完成后,加入 1 当量的叔丁基氢过氧化物,随后烯丙基双键的定向环氧化得到具有高非对映选择性的环氧醇。