Toyama Chemical Co., Ltd.

Ryuko Takeno

Isamu Saikawa

Chosaku Yoshida

Takako Hori

Hisatsugu Tsuda

Shohachi Murakami

Joji Nakano

Yasuo Kiba

Jun Nitta

Sumiko Kishimoto

Takihiro Inaba

Hiroyuki Imaizumi

Seishi Morita

Shuntaro Takano

Kiyoshi Tanaka

Hiroshi Sadaki

Kenji Takeda

Yoshiharu Murotani

Tetsuya Kajita

Hirohiko Fukuda

Junichi Yoshida

Keiichi Tanaka

Shinji Makino

Tomoya Shimotori

Hideyoshi Nagaki

This invention relates to a 4H-1-benzopyran-4-one derivative represented by the formula: ##STR1## or a salt thereof, a process for producing the same and a pharmaceutical composition comprising the same as active ingredient.

4H-1-benzopyran-4-one derivative or its salt, process for producing the

The invention relates to a process for producing a cephalosporin of the formula ##STR1## by reacting the compound ##STR2## with the compound ##STR3## in the presence of boron trifluoride or a complex thereof.

Novel process for producing a cephalosporin

This invention relates to a novel process for producing a 2-(2-aminothiazol-4-yl)glyoxylic acid derivative or a salt thereof which are useful in producing a cephalosporin antibiotic, and to intermediates for said derivative and salt and a process for producing the intermediates.

Novel process for producing 2-(2-aminothiazol-4-yl)glyoxylic acid

This invention relates to a novel aminothiazole intermediate for production of a cephalosporin of antibiotic activity.

Aminothiazole intermediate for a cephalosporin

Process for producing 2-(2-aminothiazol-4-yl)glyoxylic acid derivative

A 1-(4-aminobenzyl)-2,3-dioxopiperazine derivative represented by the formula: ##STR1## and an acid addition salt thereof have excellent carcinostatic activity but a low toxicity. Therefore, said compounds are useful as medicines and also as intermediates.

1-(4-Aminobenzyl)-2,3-dioxopiperazine derivatives, acid addition salts

Novel 1-(4-piperidiniobenzyl)-2,3-dioxopiperazine derivatives or acid

A 1-(4-aminobenzyl)-2,3-dioxopiperazine derivative represented by the formula: ##STR1## and a salt thereof have excellent carcinostatic activity but a low toxicity. Therefore, said compounds are useful as medicines and also as intermediates.

1-(4-Aminobenzyl)-2,3-dioxopiperazine derivatives and salts thereof

4-[4-(Thiazolyl-amino)benzyl]-2,3-dioxopiperazine derivatives, acid

Growing community of inventors

Toyama, Japan

Ryuko Takeno