Process for making 5-lipoxygenase inhibitors having varied heterocyclic ring systems
申请人:——
公开号:US06344563B1
公开(公告)日:2002-02-05
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 a strong base in solid form selected from the group consisting of sodium hydroxide, NaOH; and potassium hydroxide, KOH;—and optionally—in the presence of a catalytic amount of cesium carbonate, Cs2CO3, or of a phase transfer catalyst, especially a quaternary ammonium salt or a phosphonium salt—followed by—heating said reaction mixture under a nitrogen atmosphere; whereby there is produced a compound of Formula (1.3.0); and 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), which is used to prepare a preferred compound, useful as a 5-lipoxygenase inhibitor, of the formula:
especially the substantially pure methanesulfonate salt thereof.
描述了制备化合物Formula(1.3.0)的过程:包括:在无极性溶剂中建立反应混合物;在固体形式的强碱的存在下,所述强碱选自氢氧化钠(NaOH)和氢氧化钾(KOH)等组成的群体;—并且—在需要时,在氧化镉(Cs2CO3)的催化剂量或相转移催化剂,特别是季铵盐或磷铵盐的存在下—随后—在氮气氛下加热所述反应混合物;从而产生化合物Formula(1.3.0);在一种优选实施例中,无极性溶剂为DMSO,固体形式的强碱为粉末或颗粒形式的NaOH,相转移催化剂为四正丁基铵盐(TBAC),用于制备一种优选化合物,其作为5-脂氧合酶抑制剂,具有特定的化学式:尤其是其相对纯的甲磺酸盐。