Enantioselective Aza-Henry Reaction with an <i>N</i>-Sulfinyl Urea Organocatalyst
作者:MaryAnn T. Robak、Monica Trincado、Jonathan A. Ellman
DOI:10.1021/ja075653v
日期:2007.12.1
simultaneously acidify the urea and provide asymmetric induction in hydrogen-bond-catalyzed reactions. The utility of this new catalyst structure is demonstrated by the high selectivity provided in the aza-Henryreaction not only for aromatic N-Boc imine substrates but also for aliphatic imines for which enantioselective H-bonding catalysis has not previously been demonstrated.
Enantioselective aza-Henry reaction of t-Boc protected imines and nitroalkanes with bifunctional squaramide organocatalysts
作者:Dilşad Susam、Cihangir Tanyeli
DOI:10.1039/c6nj04078k
日期:——
An organocatalytic asymmetric aza-Henry reaction of t-Boc protected imines with nitroalkanes has been established by chiral acid–base type bifunctional Cinchona alkaloid/squaramideorganocatalysts. The cooperation of a quinine motif as a base and sterically encumbered squaramide (H-bond donor) enabled mostly complete conversion of a range of reactants into the corresponding aza-Henry products at room
t - Boc保护的亚胺与硝基烷烃的有机催化不对称aza-Henry反应是通过手性酸碱型双功能金鸡纳生物碱/方酰胺有机催化剂建立的。奎宁基序作为碱和空间受限的方酰胺(氢键供体)的配合,可以在室温下以良好的选择性将一系列反应物完全转化为相应的aza-Henry产品(选择性高达91%ee,10 mol)催化剂负载百分比)。
Catalytic Enantioselective Aza-Henry Reaction with Broad Substrate Scope
ammonium chlorides to provide the corresponding aza-Henry adducts in good yields and very high selectivities. It represents the first general enantioselectiveaza-Henry method for azomethines derived from enolizable aldehydes, giving rise to enantiomeric excesses above 94%. In addition, the reactions with nitroethane afforded high diastereo- and enantioselectivities (syn:anti up to 95:5; up to 98% ee for syn)
Asymmetric aza-Henry reaction of BOC-protected imines with zinc-FAM catalyst
作者:Nurzhan Beksultanova、Özdemir Doğan
DOI:10.1080/00397911.2024.2303054
日期:2024.3.3
Derivatives of ferrocenyl-substituted aziridinyl methanol (FAM) ligands were used with zinc metal for asymmetric aza-Henry (nitro-aldol) reaction of N-Boc protected imines with nitroalkanes. At opt...