Process for making 5-lipoxygenase inhibitors having varied heterocyclic ring systems

• Main Authors: NORRIS, TIMOTHY, HNATOW, MEGAN ELIZABETH
• Format: Patent
• Language: English; French; German
• Published: 11.04.2001
• Edition: 7
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; APPARATUS THEREFOR; CHEMISTRY; GENERAL METHODS OF ORGANIC CHEMISTRY; HETEROCYCLIC COMPOUNDS; HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE; METALLURGY; ORGANIC CHEMISTRY; PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES; SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS ORMEDICINAL PREPARATIONS

A process is described for preparing a compound of Formula (1.3.0): comprising: establishing a reaction mixture consisting of in an aprotic solvent; in the presence of NaOH or KOH; optionally in the presence of a phase transfer catalyst, especially a quaternary ammonium salt or a phosphonium salt; followed by heating said reaction mixture under a nitrogen atmosphere; in a preferred embodiment the aprotic solvent is DMSO, the strong base in solid form is NaOH in powder or pellet form, and the phase transfer catalyst is tetra-n-butylammonium chloride (TBAC); wherein the starting material of Formula (2.0.0) is prepared as follows: are reacted together in a solvent consisting of a straight or branched chain aliphatic alcohol; in the presence of a strong base consisting of NaOH or KOH; further in the presence of a transition metal catalyst comprising a palladium metal complex; and still further in the presence of an auxiliary ligand comprising a bidentate, chiral, axially dissymmetric aromatic compound of Formula (5.5.0) or (5.5.1):