The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 09, 1994
Filed:
Nov. 03, 1992
Masakatsu Shibasaki, Mitaka, JP;
Hiroaki Sasai, Chiba, JP;
Chisso Corporation, Osaka, JP;
Abstract
The present invention provides a catalyst for asymmetric synthesis prepared from a dialkali metal salt of an optically active 2,2'-dihydroxy-1,1'-binaphthyl represented by the formula (I.sub.R) ##STR1## or the formula (I.sub.S) ##STR2## (wherein M is Li, K or Na), a lanthanum compound represented by LaX.sub.3 (X is F, Cl, Br, I, NO.sub.3 or CH.sub.3 CO.sub.2) and an alkali metal alkoxide or an alkali metal hydroxide represented by MOR or MOH (M is Li, K or Na, and R is isopropyl or t-butyl), respectively, in the presence of a water-containing solvent. The catalyst of the present invention is extremely valuable as a catalyst for asymmetric synthesis of an asymmetric nitroaldol reaction useful in the synthesis of a .beta.-hydroxynitro compound which is an important synthetic raw material for an optically active compound such as a medicine.