Eisai Company, Limited

Eisai Inc.

Hideto Ohhara

Kazutoshi Miyake

Toshiaki Ogawa

Shinji Suda

Isao Yamatsu

Toshihiko Kaneko

Takeshi Suzuki

Shigeru Souda

Yoshimasa Machida

Shigeki Hibi

Seiichiro Nomoto

Katsuya Tagami

Yasushi Okamoto

Motosuke Yamanaka

Makoto Okita

Kouichi Katayama

Kenichi Chiba

Hiroshi Shirota

Hideki Ono

Ryoichi Hashida

Masayuki Tanaka

Masaki Goto

Hideki Sakurai

Motosuki Yamanaka

Naphthalene derivatives of the formula: ##STR1## wherein R.sup.1, represents a hydrogen atom, a lower alkyl group or an acyl group; R.sup.2 independently represents a hydrogen atom, a lower alkyl group, a lower alkoxy group, a halogen atom, a cycloalkyl group, a cycloalkylalkyl group, a hydroxyl group, an aryl group which may be substituted, an arylalkyl group whose aryl group may be substituted, a heteroaryl group, or a heteroaryllakyl group; R.sup.3 represents a hydrogen atom, a lower alkyl group, a lower alkenyl group, an aryl group which may have a substituent, an arylalkyl group whose aryl group may be substituted, an arylalkenyl group whose aryl group may be substituted, a cycloalkyl group, an alkoxyalkyl group, a heteroaryl group, a heteroarylalkyl group, a carboxyl group, a carboxyalkyl group, an aminoalkyl group, or a cyano group; R.sup.6 is C.sub.1-6 alkyl; and m is 0 or an integer of from 1 to 2 useful in treating autoimmune diseases are disclosed.

Naphthalene derivative

A naphthalene derivative having the formula is new and useful for medicine. ##STR1## wherein R.sup.1 represents a hydrogen atom, a lower alkyl group or an acyl group;

A naphthalene derivative having the formula is new and useful for medicine. ##STR1## [wherein R.sup.1 represents a hydrogen atom, a lower alkyl group or an acyl group;

Novel 1-(imidazo[1,2-a]pyridin-6-yl)-2-alkanone derivatives and (imidazo [1,2-a]pyridin-6-yl) acetaldehyde derivatives are provided. The novel derivatives are intermediates for the production of 5-(6-imidazo[1,2-a]pyridyl)pyridine derivatives which are useful as cardiotonics.

1-(Imidazo[1,2-a]pyridin-6-yl)-2-alkanone derivatives and

5-(6-Imidazo[1,2-a]pyridyl)pyridine derivatives represented by general formula: ##STR1## wherein X represents hydrogen atom or methyl group; Y represents cyano group, carboxamido group, hydrogen atom, amino group or a halogen atom; Z represents hydrogen atom or a lower alkyl group; W represents hydrogen atom or a lower alkyl group; R.sup.1 represents hydrogen atom, a lower alkyl group, phenyl group, a group shown by formula: --CH.sub.2 R.sup.4 in which R.sup.4 is a lower alkoxy group, or a group shown by formula: ##STR2## in which R.sup.5 and R.sup.6 are hydrogen atom or a lower alkyl group;

5-(6-Imidazo(1,2-a)pyridyl)pyridine derivatives

5-(6-Imidazo[1,2-a]pyridyl)pyridine derivatives represented by general formula: ##STR1## wherein X represents hydrogen atom or methyl group; Y represents cyano group, carboxamido group, hydrogen atom, amino group or a halogen atom; Z represents hydrogen atom or a lower alkyl group; W represents hydrogen atom or a lower alkyl group; R.sup.1 represents hydrogen atom, a lower alkyl group, phenyl group, a group shown by formula: --CH.sub.2 R.sup.4 in which R.sup.4 is a lower alkoxy group, or a group shown by formula: ##STR2## in which R.sup.5 and R.sup.6 are hydrogen atom or a lower alkyl group; R.sup.2 represents hydrogen atom or a halogen atom; and R.sup.3 represents hydrogen atom, a lower alkyl group or a halogen atom; or a tautomer thereof; and pharmacologically acceptable salts thereof are disclosed. The 5-(6-imidazo[1,2-a]pyridyl) pyridine derivatives are effective for treating congestive heart failures.

5-(6-imidazo(1,2-a)-pyridyl)pyridine derivatives

5-(6-Imidazo[1,2-a]pyridyl)pyridine derivatives represented by general formula: ##STR1## wherein X represents hydrogen atom or methyl group; Y represents cyano group, carboxamido group, hydrogen atom, amino group or a halogen atom; Z represents hydrogen atom or a lower alkyl group; W represents hydrogen atom or a lower alkyl group; R.sup.1 represents hydrogen atom, a lower alkyl group, phenyl group, a group shown by formula: --CH.sub.2 R.sup.4 in which R.sup.4 is a lower alkoxy group, or a group shown by formula: ##STR2## in which R.sup.5 and R.sup.6 are hydrogen atom or a lower alkyl group R.sup.2 represents hydrogen atom or a halogen atom; and R.sup.3 represents hydrogen atom, a lower alkyl group or a halogen atom; or a tautomer thereof; and pharmacologically acceptable salts thereof are disclosed. The 5-(6-imidazo[1,2-a]pyridyl)pyridine derivatives are effective for treating congestive heart failures.

3-cyano-5-(6-imidazo[1,2-a]pyridyl)pyridin-2-ols useful as cardiotonics

Growing community of inventors

Tsukuba, Japan

Hideto Ohhara