Process and intermediates for the preparation of substituted 6-(3,5,6,7-tetrahydropyrrolo-[2,1-c][1,2,4]-thiadiazol-3-ylidenimino)-7-fluoro-2H-1,4-benzoxazin-3(4H)-ones
申请人:SCHERING AKTIENGESELLSCHAFT
公开号:EP0448188A3
公开(公告)日:1992-02-26
The invention relates a new process for the preparation of substituted 6-(3,5,6,7-tetrahydropyrrolo[2,1-c][1,2,4]-thiadiazol-3-ylidenimino)-7-fluoro-2H-1,4-benzoxazin-3(4H)-ones of general formula I
in which
R¹ is C₁-C₆-alkyl, C₂-C₆-alkenyl or C₃-C₆-alkynyl, and
R² and R³, which may be the same or different, are hydrogen or C₁-C₄-alkyl,
which starts from the known
a 2-amino-5-fluorophenol of formula II
via the new acetanilide of formula IV
in which R is hydrogen or chlorine,
via the new 5-nitroacetanilide of formula V
via the new 5-aminoacetanilide of formula VI
via the new 5-isothiocyanatoacetanilide of formula VIII
via the known benzoxazinone isothiocyanate of general formula IX
and via the known iminothiadiazole of general formula XI
该发明涉及一种新的制备方法,用于制备通式I的取代6-(3,5,6,7-四氢吡咯并[2,1-c][1,2,4]-噻二唑-3-基亚亚胺基)-7-氟-2H-1,4-苯并噁嗪-3(4H)-酮化合物,其中R¹为C₁-C₆-烷基,C₂-C₆-烯基或C₃-C₆-炔基,而R²和R³,可以相同也可以不同,为氢或C₁-C₄-烷基,该方法从已知的通式II的2-氨基-5-氟苯酚开始,经过新的通式IV的乙酰苯胺,其中R为氢或氯,经过新的通式V的5-硝基乙酰苯胺,经过新的通式VI的5-氨基乙酰苯胺,经过新的通式VIII的5-异硫氰酸基乙酰苯胺,经过已知的通式IX的苯并噁嗪酮异硫氰酸酯和经过已知的通式XI的亚亚胺噻二唑。