Asymmetric sequential double Michael reactions of γ,δ-unsaturated β-ketoesters to nitroolefins catalyzed by Ni (II)-diamine complex
作者:Shengying Huang、Karen Scherer、Bukuo Ni
DOI:10.1016/j.catcom.2017.08.024
日期:2017.12
The asymmetric sequential double Michaelreactions of γ,δ-unsaturated β-ketoesters and nitroolefins catalyzed by 2 mol% of readily prepared Ni(II)-bis[(R,R)-N,N′-dibenzylcyclohexane-1,2-diamine] complex and then with 1 equivalent of tetramethylguanidine (TMG) for cyclization have been developed. The reaction gave the corresponding Michael adducts of multifunctional cyclohexenol derivatives with three