Bis-phosphoric Acid Derived from BINOL Dimer as a Chiral Brønsted Acid Catalyst for Enantioselective Transformations
作者:Masahiro Terada、Yogesh Gupta、Jun Kikuchi
DOI:10.1246/cl.180977
日期:2019.3.5
A chiral bis-phosphoric acidderivedfrom a BINOL (1,1′-bi-2-naphthol) dimer as a chiral backbone was developed. The catalytic efficiency of this bis-phosphoric acid was compared with that of a rep...
BIS-PHOSPHATE COMPOUND AND ASYMMETRIC REACTION USING THE SAME
申请人:Terada Masahiro
公开号:US20120330038A1
公开(公告)日:2012-12-27
A novel bis-phosphate compound is provided which can be applied to a wide range of reactive substrates and reactions as an asymmetric reaction catalyst and can realize an asymmetric reaction affording a high yield and a high enantiomeric excess. The bis-phosphate compound has a tetraaryl skeleton represented by General Formula (1). In an asymmetric reaction, an amidodiene and an unsaturated aldehyde compound are reacted with each other in the presence of the optically active bis-phosphate compound to give an optically active amidoaldehyde. The invention allows a reaction such as an asymmetric Diels-Alder reaction to proceed efficiently, which has been difficult with conventional mono-phosphate compounds. Thus, the invention enables an industrially feasible method for the production of optically active amidoaldehydes, optically active β-amino acid derivatives, optically active diamine compounds, optically active pyrrolidine derivatives and optically active dihydropyran derivatives which are useful as products such as medicines, agricultural chemicals and chemical products as well as synthesis intermediates for such products.
differentiation of the asymmetric reaction space is possible by the remote control of the pentafluorophenyl group. Furthermore, we have conducted theoretical studies to clarify the roles of both intra- and intermolecular hydrogen bonds in the C1-symmetric chiral environment of chiral bis-phosphoric acid catalysts. The developed strategy, C1-symmetric catalyst design through hydrogenbonding, is potentially applicable
Diastereoselective synthesis of a highly substituted cis-decahydroquinoline via a Knoevenagel condensation
作者:Junfeng Huang、Stephen C. Bergmeier
DOI:10.1016/j.tet.2008.04.073
日期:2008.6
A diastereoselective approach to 3,7,8-trisubstituted cis-decahydroquinolines is described. This ring system forms the core of rings B and E of the norditerpenoid alkaloid methyllycaconitine. This approach starts with a known disubstituted cyclohexene. The remaining carbons are attached via a Knoevenagel condensation followed by an intramolecular lactam formation. The stereochemistry of the substituents is controlled by the cis-substitution of the starting cyclohexene ring. (c) 2008 Elsevier Ltd. All rights reserved.