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:EP0448188A2
公开(公告)日:1991-09-25
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
本发明涉及一种制备通式 I 的取代 6-(3,5,6,7-四氢吡咯并[2,1-c][1,2,4]-噻二唑-3-亚基亚氨基)-7-氟-2H-1,4-苯并恶嗪-3(4H)-酮的新工艺
其中
R¹ 是 C₁-C₆-烷基、C₂-C₆-烯基或 C₃-C₆-炔基,以及
R² 和 R³ 可以相同或不同,均为氢或 C₁-C₄ 烷基、
从已知的
式 II 的 2-氨基-5-氟苯酚
通过式 IV 的新乙酰苯胺
其中 R 为氢或氯、
通过式 V 的新 5-硝基乙酰苯胺
通过式 VI 的新 5-氨基乙酰苯胺
通过式 VIII 的新 5-异硫氰酸基乙酰苯胺
通过通式 IX 的已知苯并噁嗪酮异硫氰酸酯
和通式 XI 的已知亚氨基噻二唑