OPTICALLY ACTIVE QUATERNARY AMMONIUM SALT HAVING AXIAL ASYMMETRY AND PROCESS FOR PRODUCING -AMINO ACID AND DERIVATIVE THEREOF WITH THE SAME
申请人:NAGASE & COMPANY, LTD.
公开号:EP1870403A1
公开(公告)日:2007-12-26
The present invention provides a chiral phase-transfer catalyst of the following formula (I):
The compound (I) can be produced by reacting a 2,2'-dimethylene bromide-1,1'-biphenyl derivative, which can be produced through comparatively small number of steps, with an easily available secondary amine.
OPTICALLY ACTIVE QUATERNARY AMMONIUM SALT HAVING AXIAL ASYMMETRY AND PROCESS FOR PRODUCING ALPHA-AMINO ACID AND DERIVATIVE THEREOF WITH THE SAME
申请人:Maruoka Keiji
公开号:US20090270614A1
公开(公告)日:2009-10-29
The present invention provides a chiral phase-transfer catalyst of the following formula (I):
The compound (I) can be produced by reacting a 2,2′-dimethylene bromide-1,1′-biphenyl derivative, which can be produced through comparatively small number of steps, with an easily available secondary amine.
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.