Reference of Copper(I) tetra(acetonitrile) tetrafluoroborate. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Copper(I) tetra(acetonitrile) tetrafluoroborate, is researched, Molecular C8H12BCuF4N4, CAS is 15418-29-8, about Enantio- and Diastereoselective Synthesis of β-Aryl-β-Pyrazolyl α-Amino acid esters via Copper-Catalyzed Reaction of Azomethine Ylides with Benzylidenepyrazolones. Author is Gong, Yan-Chuan; Wang, Yue; Li, Er-Qing; Cui, Hao; Duan, Zheng.
A fully stereoselective synthesis of unnatural chiral β-aryl-β-pyrazolyl α-amino acid esters via copper-catalyzed addition reactions of azomethine ylides with benzylidenepyrazolones bearing two contiguous stereogenic centers was developed. A 1H-pyrazol-5-ol was introduced by the aromatization of 3H-pyrazol-3-one in the reaction. The transformation operated at room temperature and afforded β-1H-pyrazol-5-ol-α-amino esters in high yields with good to excellent levels of diastereo- and enantioselectivity.
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