Three-component asymmetric catalytic Ugi reaction--concinnity from diversity by substrate-mediated catalyst assembly.
Three-component asymmetric catalytic Ugi reaction--concinnity from diversity by substrate-mediated catalyst assembly.
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DOI:
10.1002/anie.201310491
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发表时间:
2014-03-24
影响因子:
16.6
通讯作者:
Wulff, William D.
中科院分区:
文献类型:
--
作者:
Zhao, Wenjun;Huang, Li;Guan, Yong;Wulff, William D.
The first asymmetric catalyst for the 3-component Ugi reaction was identified as a result of a screen of a large set of different BOROX catalysts. The BOROX catalysts are assembled in-situ from a chiral biaryl ligand, an amine, water, BH3•SMe2 and an alcohol or phenol. The catalyst screen included 13 different ligands, 12 amines and 47 alcohols or phenols. The optimal catalyst (LAP 8-5-47) provides the α-amino amides with excellent asymmetric induction from an aldehyde, 2° amine and an isonitrile. The catalyst is proposed to consist of an ion pair combination of a chiral boroxinate anion and an iminium cation.
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