Cyclometallated Gold(III) Complexes as Effective Catalysts for Synthesis of Propargylic Amines, Chiral Allenes and Isoxazoles
作者:Karen Ka-Yan Kung、Vanessa Kar-Yan Lo、Hok-Ming Ko、Gai-Li Li、Pui-Ying Chan、King-Chi Leung、Zhongyuan Zhou、Ming-Zhong Wang、Chi-Ming Che、Man-Kin Wong
DOI:10.1002/adsc.201300005
日期:2013.7.8
were achieved in chiral allene synthesis. Chiral allene racemization could be minimized by using 1f as catalyst. The PEG‐linked catalyst 1m is the most catalytically active towards synthesis of propargylic amines, in which case a product turnover of 900 was achieved. Moreover, 1m could be repeatedly used for 12 reaction cycles, leading to an overall turnover number of 872.
合成了一系列环金属化的金(III)配合物[Au()Cl 2 ] 1a – 1(H =芳基吡啶)和PEG连接的配合物1m。配合物1a – m可有效催化炔丙基胺,手性烯丙基和异恶唑的合成。六元环环金属化金(III)配合物1f – l比五元环环金属化金(III)配合物1a – e具有更高的催化活性。可以通过使用手性醛和/或胺底物来调节炔丙基胺的非对映选择性。优异的对映选择性(90–98%ee)是在手性丙二烯合成中获得的。通过使用1f作为催化剂,手性烯丙基外消旋化作用可以减至最小。PEG连接的催化剂1m对炔丙基胺的合成具有最强的催化活性,在这种情况下,产品周转量达到900。此外,1m可重复使用12个反应周期,因此总周转数为872。