NHC‐Ni(0) Catalyzed Diastereodivergent Hydroacylative Enyne Cyclization: Synthesis of Heterocycles bearing γ‐Enone
作者:Xuefeng Yong、Elvis Wang Hei Ng、Zibo Zhen、Xiulian Lin、Weiwei Gao、Chun‐Yu Ho
DOI:10.1002/adsc.202000718
日期:2020.10.6
NHC‐Nickel(0) catalyzed 1,3‐ and 1,4‐diastereodivergent hydroacylative heteroenyne cyclization with aldehydes was achieved (Syn‐:Anti‐, switchable from up to 1:99 to 98:2). Both sets of heterocyclic diastereomers are accessible via this route, with a high γ‐:α‐enone structure ratio. Preliminary DFT investigations indicated that the manipulation of the N‐substituent exerts a direct influence on the
通过NHC-镍(0)催化了1,3-和1,4-非对映异构的加氢醛基醛的环化反应(Syn :: Anti,可从1:99切换到98:2)。两组杂环非对映异构体均可以通过此途径获得,并具有较高的γ-:α-烯酮结构比。DFT的初步研究表明,对N取代基的操纵直接影响了NHC-尼克-弹性环戊烯形成的非对映选择性。计算中指出的与环内键角(CZ-C)变化相关的能量差可能可能解释了观察到的宽范围和高非对映异构选择性。