Cheiljedang Corp.

Youn Ha Lee

Kwang Hyuk Lee

Young Gi Kim

Chung Keun Rhee

Myung Xik Xiang

Byoung Chool Suh

Kwang Ho Lee

Hak Sung Kim

Yeo H Yoon

Jin Ah Kang

Novel 4,5-diamino pyrimidine derivatives are described by the following general formula I:

4,5-diaminopyrimidine derivatives and a method for the preparation thereof

A phosphodiesterase IV inhibiting cathecol derivatives of the general formula I: ##STR1## or a pharmaceutically acceptable salt thereof in which R1 is C.sub.1-7 alkyl; C.sub.3-7 cycloalkane; phenyl optionally substituted with lower alkyl lower alkoxy, nitro or halogen; pyrimidine optionally substituted with lower alkyl, lower alkoxy, nitro or halogen; or pyridine optionally substituted with lower alkyl, lower alkoxy, nitro or halogen; X, Y and Z are each independently oxygen, nitrogen or sulfur optionally substituted with C.sub.1-7 alkyl, C.sub.3-7 cycloalkane or phenyl; W is oxygen or sulfur is disclosed. In addition, a process for producing the compound of the general formula I and a pharmaceutical composition containing pharmaceutically effective amount of the compound of the general formula I are disclosed.

Cathecol derivatives and a method for the preparation thereof and a

An antibacterially effective compound of formula I: ##STR1## or a salt or hydrate thereof in which R1, R2, R3, R4, R5, X are as defined herein. Further, a process for producing the compound of formula I and an antibacterial composition containing antibacterially effective amount of the compound of formula I are disclosed.

Oxazolidinone derivatives and a method for the preparation thereof and

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Kyungkee-do, South Korea

Youn Ha Lee