Chiral biaryl alcohols were readily transformed in a single step, with chiral nonracemic 1,2-diamines, PCl3, and sulfur in CDCl3 - all in a NMR tube - to their diastereomeric diazaphospholidines and their diastereomeric ratios (also ee's) assessed directly.
Alexakis A., Frutos J. C., Mangeney P., Meyers A. I., Moorlag Henk, Tetrahedron Lett, 35 (1994) N 29, S 5125-5128
作者:Alexakis A., Frutos J. C., Mangeney P., Meyers A. I., Moorlag Henk
DOI:——
日期:——
A highly stereoselective synthesis of axially chiral biaryls. Application to the synthesis of a potential chiral catalysts.
作者:A.I. Meyers、Anton Meier、David J. Rawson
DOI:10.1016/s0040-4039(00)91558-2
日期:1992.2
diastereoselectivities (⪢98:2) have been obtained in the biaryl coupling of 2′,6′,-disubstituted aryl Grignard reagents 1 with aryl oxazolines 6, conveniently synthesised from the optically pure amino alcohols L-valinol and (S)-t-leucinol.
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.