Me-BIPAM for the Synthesis of Optically Active 3-Aryl-3-hydroxy-2-oxindoles by Ruthenium-catalyzed Addition of Arylboronic Acids to Isatins
作者:Yasunori Yamamoto、Masaaki Yohda、Tomohiko Shirai、Hajime Ito、Norio Miyaura
DOI:10.1002/asia.201200481
日期:2012.10
arylboronic acids to isatins. Asymmetric synthesis of 3‐aryl‐3‐hydroxy‐2‐oxindoles by 1,2‐addition of arylboronic acids to isatins was carried out in the presence of [RuCl2(PPh3)3]/(R,R)‐Me‐BIPAM and KF, resulting in an enantioselectivity as high as 90 % ee. It was found that the reaction with N‐protected isatins proceeds with high yields and good enantioselectivities. The best protective groups on the
一个手性的O-连接的C 2-对称的二齿亚磷酰胺(Me-BIPAM)被发现对于钌催化的芳基硼酸到靛红的加成反应是有效的。在[RuCl 2(PPh 3)3 ] /(R,R)-Me-的存在下,通过将芳基硼酸1,2-加成到靛红中进行3-芳基-3-羟基-2-氧吲哚的不对称合成。BIPAM和KF,对映选择性高达90%ee。发现与N保护的靛红的反应以高收率和良好的对映选择性进行。氮原子上的最佳保护基根据芳环上的取代基而不同。使用一个与其他基团相比,N-苄基在许多底物中均具有出色的对映选择性。