Toyo Jozo Kabushiki Kaisha

Asahi Kasei Kogyo Kabushiki Kaisha

Toyo Jozo Company, Ltd.

Hideyuki Watanabe

Hideo Sakakibara

Tatsuro Fujiwara

Takao Hirano

Daisuke Mochizuki

Masao Yaso

Tatsuro Fijiwara

2-alkoxy-5,6,7,8-tetrahydroquinoxaline derivatives, and production

20-O-Acyl-19,20-enolmacrolide antibiotic derivatives represented by the following general formula (I): ##STR1##

20-O-Acyl-19,20-enolmacrolide antibiotic derivatives

A compound of the formula ##STR1## wherein R.sub.1 is hydrogen, --COOR.sub.11 or ##STR2## R.sub.11 is optionally substituted lower alkyl, R.sub.12 is optionally substituted hydrocarbon, heterocyclic or heterocyclic-lower alkyl, R.sub.13 is hydrogen or lower alkyl, or R.sub.12 and R.sub.13 together constitute a heterocyclic ring together with the attached nitrogen atom, and R.sub.2 is hydrogen or hydroxyl, or a pharmaceutically-acceptable salt thereof, has stronger antibacterial activity against Gram-positive bacteria than does tylosin. It is produced by deformylation, or by oxidizing a formyl at position-14, or by amidating the latter compound.

14-de(hydroxymethyl)-mycaminosyltylonolide derivatives

Novel 23-demycinosyldesmycosin derivatives are disclosed of the formula ##STR1## wherein A is oxygen or sulfur, R.sub.1 is optionally substituted phenyl or ##STR2## group, in which R.sub.3 is optionally substituted phenyl and R.sub.4 and R.sub.5 are the same or different and are hydrogen, lower alkyl or optionally substituted phenyl, and R.sub.2 is hydrogen or hydroxyl. The compounds or non-toxic salts thereof are useful as antibiotics.

23-Demycinosyldesmycosin derivatives

Compounds of the formula ##STR1## wherein R.sub.1 is optionally substituted phenyl, thienyl, 2-amino-4-thiazolyl or 2-chloroacetamido-4-thiazolyl; A is lower alkylene, lower alkenylene, or lower alkylene substituted by lower alkyl, amino, lower alkoxyimino or phenyl-Z-group wherein Z is a single bond or --S-- or --SO.sub.2 --, but when R.sub.1 is 2-amino-4-thiazolyl or 2-chloroacetamido-4-thiazolyl then A is lower alkylene substituted by lower alkoxyimino; R.sub.2 is hydrogen or hydroxyl; X is oxygen or sulfur and n=0 or 1, or a non-toxic salt thereof. These compounds have a stronger antibacterial activity against Gram positive bacteria as compared with known macrolide antibiotics such as erythromycin and tylosin, and also have an equivalent level of antibacterial activity against Gram negative bacteria as compared with that of erythromycin, and hence may be useful for clinical use. These compounds are also useful for feed additives and growth stimulants.

Growing community of inventors

Shizuoka, Japan

Hideyuki Watanabe