title: Nickel(II)-catalyzed enantioselective 1,3-dipolar cycloaddition of azomethine imines with alkylidene malonates.
abstract: We demonstrated an asymmetric 1,3-dipolar cycloaddition of azomethine betaines with alkylidene malonates by using a chiral N,N'-dioxide-Ni(II) complex as a catalyst. Both aromatic- and aliphatic-substituted alkylidene malonates were found to be suitable for the reaction. A range of trans-pyrazolone derivatives was exclusively obtained with excellent yields (up to 99% yield) and good enantioselectivities (up to 97% ee) under mild reaction conditions. The reaction could be carried out on a gram scale with the good results being maintained. Control experiments were performed to elucidate the specific diastereoselectivity of the reaction. The formation of single trans isomers was dominated by secondary orbital interactions between the ester groups of the dipolarophile and the azomethine imine. On the basis of the experimental results and previous reports, a possible catalytic model was assumed.
authors: Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P.R. China.
authors: Jiangting
authors: J
authors: Li
authors: Xiangjin
authors: X
authors: Lian
authors: Xiaohua
authors: X
authors: Liu
authors: Lili
authors: L
authors: Lin
authors: Xiaoming
authors: X
authors: Feng
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D061565:Cycloaddition Reaction; D007097:Imines / Q000737:chemistry*; D008314:Malonates / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D047069:Pyrazolones / Q000138:chemical synthesis* / Q000737:chemistry; D013237:Stereoisomerism; D013882:Thiosemicarbazones / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D007097:Imines; D008314:Malonates; D047069:Pyrazolones; D013882:Thiosemicarbazones; C512188:azomethine; C038362:pyrazolone; D009532:Nickel