Process for producing antifungal pyridazinone derivatives and certain novel compounds produced by such a process
申请人:SANKYO COMPANY LIMITED
公开号:EP0089650A1
公开(公告)日:1983-09-28
Compounds of formula (I):
[wherein R' and R3 represent hydrogen or halogen atoms, R2 represents a hydrogen or halogen atom or a lower alkyl or alkoxy group (provided R', R2 and R3 are not simultaneously hydrogen), ...... represents a single or double carbon-carbon bond and, where it is a single bond, R4 represents a group of formula -SR5 (wherein R5 represents an optionally substituted alkyl, phenyl, aralkyl or pyridyl group or a lower alkenyl group) and, where it is a double bond, R4 represents hydrogen] can be prepared by reacting a compound of formula (II):
with a compound of formula R6H [where R6 represents a group -SR5, a group -SR7 (where R7 represents a group of formula
and Y represents oxygen or sulphur, R8 and R9 represent lower alkoxy groups and R10 represents a lower alkoxy, lower alkyl or phenyl group), a methoxy group or a halogen atom) to give a compound of formula (IV):
or, where R6 represents a methoxy group, a methyl ester thereof; reacting this compound with hydrazine to give a compound of formula (V):
or (VI):
and if necessary, treating the compound of formula (V) with an acid or a base to produce the compound of formula (VI). All of the compounds of formula (I) are valuable antifungal agents and compounds of formula (V) where R6 represents a group of formula -SR5 are novel compounds.
式(I)化合物:
其中 R' 和 R3 代表氢原子或卤素原子,R2 代表氢原子或卤素原子或低级烷基或烷氧基(条件是 R'、R2 和 R3 不同时为氢),...... 代表单碳碳键或双碳碳键,如果是单键,R4 代表式-SR5 的基团(其中 R5 代表任选取代的烷基、苯基、芳烷基或吡啶基或低级烯基),如果是双键,R4 代表氢]可通过式(II)化合物与式 R6H[其中 R6 代表基团-SR5、基团-SR7(其中 R7 代表基团-SR7)、基团-R6H]反应制备:
与式 R6H[其中 R6 代表一个基团-SR5、一个基团-SR7(其中 R7 代表一个式基团
和 Y 代表氧或硫,R8 和 R9 代表低级烷氧基,R10 代表低级烷氧基、低级烷基或苯基)、甲氧基或卤原子),得到式(IV)化合物:
或(其中 R6 代表甲氧基)其甲酯;将该化合物与肼反应,得到式(V)化合物:
或 (VI):
必要时,用酸或碱处理式(V)化合物,生成式(VI)化合物。所有式(I)化合物都是有价值的抗真菌剂,而式(V)化合物(其中 R6 代表式-SR5 的基团)则是新型化合物。