Nissan Chemical Industries Limited

Takashi Matsumoto

Keizo Tanikawa

Nobutomo Tsuruzoe

Ryozo Sakoda

Ken-ichi Shikada

Akira Saito

Hiroo Matsumoto

Hitoshi Nakabeppu

Norimasa Shudo

Yasunori Asada

Masumi Nakamura

Pyrazolones derivatives

Pyridazinone derivatives represented by the formula (I) and antiplatelet agents containing them: ##STR1## �wherein R is a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group, X is a hydrogen atom, a chlorine atom or a bromine atom, Ar is a pyridyl group or a phenyl group substituted with OR.sup.1 (wherein R.sup.1 is a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group) and A {wherein A is a hydrogen atom, a halogen atom, a C.sub.1 -C.sub.4 alkyl group or OR.sup.2 (wherein R.sup.2 is a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group)}, Y is C.sub.1 -C.sub.8 alkylene wherein one carbon atom on the straight chain is substituted with one OR.sup.1 group (wherein R.sup.1 is the same as defined above), and Z.sup.1 and Z.sup.2 are independently a hydrogen atom, a halogen atom, a C.sub.1 -C.sub.4 alkyl group or a OR.sup.1 group (wherein R.sup.1 is the same as defined above)!. These compounds have strong antiplatelet effects, are excellently safe, and can be used as active ingredients of prophylactic and therapeutic drugs for various thrombotic diseases.

Pyridazinone derivatives

A compound of the formula, ##STR1## or its pharmaceutically acceptable salt, and its preparation process and pharmaceutical compositions characterized by containing these compounds as effective ingredients. These compounds have strong antithrombotic activity, cardiotonic activity, vasodilator activity and anti-SRS-A activity, and are useful as prophylactic or therapeutic agents for various thrombotic affections, congestive heart failure, hypertension, asthma, immediate type allergy diseases and the like.

5-heteroarylamino-6-oxy-substituted 3(2H)-pyridazinones

A compound of the formula: ##STR1## or its pharmaceutically acceptable salt and pharmaceutical compositions containing these compounds as effective ingredients. These compounds have strong antithrombotic activity, cardiotonic activity, vasodilator activity and anti-SRS-A activity, and are useful as prophylactic or therapeutic agents for various thrombotic afflictions, congestive heart failure, hypertension, asthma, immediate-type allergy diseases and the like.

5-arylmethylamino-6-oxy-substituted 3(2H)-pyridazinones

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Takashi Matsumoto