銅催化的好氧氧化交叉偶聯反應研究取得新突破
作者:
小柯機器人發布時間:2020/12/31 23:01:41
上海交通大學田金淼課題組與蘭州大學塗永強教授合作,在銅催化的好氧氧化交叉偶聯反應的研究中取得一項新突破。2020年12月28日,國際知名學術期刊《德國應用化學》發表了這一成果。
研究人員首次成功實現了具有挑戰性的直接非對稱催化的2-萘胺和2-萘酚之間的好氧氧化交叉偶聯反應。通過他們開發的Cu(I)/SPDO體系,實現了3,3'-雙取代NOBIN的手性富集,該化合物可用於衍生各種手性配體和催化劑。該反應具有高手性選擇性(高達96% ee)和高產率(高達80%)。
機理研究認為該交叉偶聯反應包括一個自由基-陰離子偶聯過程。密度泛函理論計算表明,在L17的CF3和2-萘酚的H-1,8之間F-H相互作用,以及兩個交叉偶聯對象間的π-π堆積作用在該交叉偶聯反應的手性控制中扮演了關鍵的角色。
附:英文原文
Title: Enantioselective Synthesis of 3,3』‐Disubstituted 2‐Amino‐2'‐hydroxy‐1,1』‐binaphthyls by Copper‐Catalyzed Aerobic Oxidative Cross‐Coupling
Author: Xiao-Jing Zhao, Zi-Hao Li, Tong-Mei Ding, Jin-Miao Tian, Yongqiang Tu, Ai-Fang Wang, Yu-Yang Xie
Issue&Volume: 28 December 2020
Abstract: A challenging direct asymmetric catalytic aerobic oxidative cross‐coupling of 2‐naphthylamine and 2‐naphthol, using a novel Cu(I)/SPDO system we explored, has been successfully developed for the first time, achieving enantioenriched 3,3』‐disubstituted NOBINs, that could be readily derived to divergent chiral ligands and catalysts. This reaction features high enantioselectivities (up to 96% ee) and good yields (up to 80%). The mechanism studies propose the cross‐coupling involves a radical‐anion coupling process. The DFT calculations suggest that the F‐H interactions between CF 3 of L17 and H‐1,8 of 2‐naphthol, and the π‐π stacking between the two coupling partners would play vital roles in enantio‐control of this cross‐coupling reaction.
DOI: 10.1002/anie.202015001
Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202015001