Catalytic enantioselective allylation of ketoimines

Catalytic enantioselective allylation of ketoimines
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DOI:
10.1021/ja061510h
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发表时间:
2006-06-14
影响因子:
15
通讯作者:
Shibasaki, Masakatsu
Shibasaki, Masakatsu
中科院分区:
化学1区
文献类型:
--
作者:
Wada, Reiko;Shibuguchi, Tomoyuki;Shibasaki, Masakatsu

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本文研究了简单酮亚胺的烯丙基化反应,用1mol%CuF(.)3 PPh(3)为催化剂,1.5mol%La((OPr)-Pr-/)(3)为助催化剂,稳定无毒的烯丙基硼酸频哪醇酯为亲核试剂。该反应为酮亚胺的第一次催化对映选择性烯丙基化反应提供了良好的模板。在这种情况下,使用(LiOPr)-Pr-i作为助催化剂比La((OPr)-Pr-i)(3)产生更高的对映选择性和反应性。因此,在tBuOH(1当量)存在下使用CuF-环戊基-DuPHOS络合物(10摩尔%)和(LiOPr)-Pr-1(30摩尔%)从一系列芳族酮亚胺产生高达93%ee的高对映选择性。机理研究表明,(LiOPr)-Pr-i通过增加活性亲核试剂烯丙基铜的浓度来加速反应。
A general catalytic allylation of simple ketoimines was developed using 1 mol % of CuF(.)3PPh(3) as catalyst, 1.5 mol % of La((OPr)-Pr-/)(3) as the cocatalyst, and stable and nontoxic allylboronic acid pinacol ester as the nucleophile. This reaction constituted a good template for developing the first catalytic enantioselective allylation of ketoimines. In this case, using (LiOPr)-Pr-i as the cocatalyst produced higher enantioselectivity and reactivity than La((OPr)-Pr-i)(3). Thus, using the CuF-cyclopentyl-DuPHOS complex ( 10 mol %) and (LiOPr)-Pr-i ( 30 mol %) in the presence of tBuOH (1 equiv) produced high enantioselectivity up to 93% ee from a range of aromatic ketoimines. Mechanistic studies indicated that (LiOPr)-Pr-i accelerates the reaction by increasing the concentration of an active nucleophile, allylcopper.