Synthesis and Atropo-diastereoselective Ring Cleavage of a [Cp*Ru]-Complexed Biaryl Lactone: Experimental and Computational Investigations
作者:Gerhard Bringmann、Andreas Wuzik、Ralf Stowasser、Christian Rummey、Lothar Göbel、Dietmar Stalke、Matthias Pfeiffer、Wolfdieter A. Schenk
DOI:10.1021/om9906520
日期:1999.11.1
The planar-chiral biaryl lactone complex 5b is cleaved highly atropo-diastereoselectively by simple O-nucleophiles. Toward H-nucleophiles, it shows a different reactivity behavior consistent with DF calculations using the Fukui function.
Novel concepts in directed biaryl synthesis
作者:G. Bringmann、O. Schupp、K. Peters、L. Walz、H.G. von Schnering
DOI:10.1016/0022-328x(92)88011-7
日期:1992.10
The preparation is reported of the first series of (racemic) chiral rhenium complexes with "axially prostereogenic" biaryl lactone ligands, which are potential substrates for atropisomer-selective biaryl syntheses. NMR spectroscopy reveals the presence of both helimeric forms of the twisted biaryllactone ligand for the more hindered representatives (R = Me, Et), whereas the less hindered compounds (R = H, OMe) show rapid interconversion of the two helimeric diastereomers. In the crystal, by contrast, one of the complexes (R = OMe) occurs as only one of the two possible diastereomers, as shown by an X-ray diffraction study.
Bringmann, Gerhard; Hartung, Thomas; Goebel, Lothar, Liebigs Annalen der Chemie, 1992, # 3, p. 225 - 232
作者:Bringmann, Gerhard、Hartung, Thomas、Goebel, Lothar、Schupp, Olaf、Ewers, Christian L. J.、et al.
DOI:——
日期:——
Bringmann, Gerhard; Hartung, Thomas; Goebel, Lothar, Liebigs Annalen der Chemie, 1992, # 7, p. 769 - 776
作者:Bringmann, Gerhard、Hartung, Thomas、Goebel, Lothar、Schupp, Olaf、Peters, Karl、Schnering, Hans Georg von