The present disclosure provides a method for the preparation of aromatic sulfonyl halides by contacting a substituted phenyl compound with a halosulfonic acid and trifluoroacetic acid. The present disclosure further provides a method for the preparation of 4-[5-methyl-3-phenylisoxazol-4-yl]benzenesulfonamide which is useful in treating cyclooxygenase-2 related disorders.
[EN] METHOD FOR PREPARING BENZENESULFONYL COMPOUNDS<br/>[FR] PROCEDE DE PREPARATION DE COMPOSES DE BENZENESULFONYLE
申请人:PHARMACIA CORP
公开号:WO2003029230A1
公开(公告)日:2003-04-10
The present disclosure provides a method for the preparation of aromatic sulfonyl halides by contacting a substituted phenyl compound with a halosulfonic acid and trifluoroacetic acid. The present disclosure further provides a method for the preparation of 4-[5-methyl-3-phenylisoxazol-4-yl]benzenesulfonamide which is useful in treating cyclooxygenase-2 related disorders.
Upon irradiation at 253·7 nm, 2-isoxazolines undergo three types of formal [2 + 2] cycloreversions, in addition to 1,2-bond cleavage followed by further transformation. To determine whether the localized excitation of a particular chromophore is responsible for each type of reaction, the effects of sensitizer, quencher and excitation wave-length were examined with selected 2-isoxazolines. It is suggested