Chiral oxazoline route to enantiomerically pure biphenyls: magnesio and copper mediated asymmetric hetero- and homo-coupling reactions
作者:A.I Meyers、Todd D Nelson、Henk Moorlag、David J Rawson、Anton Meier
DOI:10.1016/j.tet.2004.01.095
日期:2004.5
manipulated to various other chiral biphenyls. Another series of chiral biphenyls were obtained via an asymmetric Ullmann reaction, which was shown to be thermodynamically controlled. The de's of this coppermediated process were also in the range of 90% and could be utilized to reach various derivatives. Racemization, thermal stability, and atropisomerization characteristics were also studied.
Stereomanipulation of (η5-1-Arylcyclohexadienyl)iron Complexes
作者:Christopher E. Anson、Andrei V. Malkov、Caroline Roe、Elizabeth J. Sandoe、G. Richard Stephenson
DOI:10.1002/ejoc.200700919
日期:2008.1
A crystallographic investigation comparing five 1-aryl-substituted tricarbonyl[(1–5-η)-cyclohexadienyl]iron(1+) salts demonstrates that introducing additional electron density on the aromatic ring increases π overlap between the arene and the cyclohexadienyl ligand, thus flattening the structures sufficiently to make available a conformation in which nucleophiles can approach the site of substitution
Oxazoline-mediated biaryl coupling reactions. Stereocontrolled synthesis of 2,2′,6,6′-tetrasubstituted biphenyls.
作者:Henk Moorlag、A.I. Meyers
DOI:10.1016/s0040-4039(00)61578-2
日期:1993.10
High diastereoselectivities (93:7) were observed in the biaryl coupling of 2′,6′-disubstituted aryl Grignard reagents of 1 with aryloxazolines 2. The diastereoselectivities observed in the coupling reaction varied primarily as a function of the chelating properties of the ortho substituents on the aryl Grignard reagent.