METHOD FOR PRODUCING OPTICALLY ACTIVE 5-HYDROXY-3-KETOESTER
申请人:NISSAN CHEMICAL INDUSTRIES, LTD.
公开号:US20160185734A1
公开(公告)日:2016-06-30
The object of the present invention is to provide a method for producing in high yield with high stereoselectivity an optically active 5-hydroxy-3-ketoester compound which is useful as an intermediate for a pharmaceutical. A novel method for producing an optically active 5-hydroxy-3-ketoester compound in which an asymmetric aldol reaction by use of 1,3-diene compound is carried out in the presence of an optically active binaphthol-titanium complex together with a substituted nitrogen-containing 5 or 6-membered aromatic heterocyclic compound to obtain an optically active 5-hydroxy-3-ketoester compound in high yield with high stereoselectivity; and a novel production intermediate having a crystalline form.
PROCESS FOR PREPARING QUINOLYLACRYLONITRILE AND INTERMEDIATES THEREFOR
申请人:——
公开号:US20030013885A1
公开(公告)日:2003-01-16
3-[2-Cyclopropyl-4-(4-fluorophenyl)-3-quinolyl]prop-2-enenitrite is prepared by reacting 2-cyclopropyl-4-(4-fluorophenyl)quinoline-3-carbaldehyde with acetonitrile in the presence of a base and then adding a dehydrating to the reaction mixture to conduct dehydration. Under ordinary conditions, novel 3-[2-cyclopropyl-4-(4-fluorophenyl)-quinolin-3-yl]-3-hydroxypropionitrile is formed as an intermediate in the above reaction. Incidentally, when the above reaction is conducted in an organic solvent, 3-[2-cyclopropyl-4-(4-fluorophenyl)-3-quinolyl]-prop-2-enenitrite is directly formed.
The invention relates to a process for the manufacture of a compound of formula
1
or a salt, especially a pharmaceutically acceptable salt with a base, thereof or a lactone thereof wherein the element
represents —CH
2
—CH
2
— or —CH═CH— and R represents a cyclic radical.