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Nickel(II)‐Catalyzed Enantioselective 1,3‐Dipolar Cycloaddition of Azomethine Imines with Alkylidene Malonates
Author(s) -
Li Jiangting,
Lian Xiangjin,
Liu Xiaohua,
Lin Lili,
Feng Xiaoming
Publication year - 2013
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201203891
Subject(s) - enantioselective synthesis , cycloaddition , catalysis , azomethine ylide , chemistry , imine , yield (engineering) , nickel , 1,3 dipolar cycloaddition , nitrone , medicinal chemistry , organic chemistry , combinatorial chemistry , materials science , metallurgy
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.