Antibiotic aminoglycosides, processes of preparation and pharmaceutical compositions

Claim 2

The 4-O-(2',6'diamino 2',6'-didesoxyα, D-glucopy rannosyl) 6-O-(3"-amino 3",4",6"-tridesoxy α, D-xylohexopyrranoxyl) 2-desoxy streptamine of the formula: ##STR14## or the pharmaceutically acceptable salts with mineral or organic acids thereof.

Claim 3

A product according to claim 1 wherein the mineral or organic acid is sulfuric acid, hydrochloric acid, phosphoric acid, hydrobromic acid, nitric acid, succinic acid, tartaric acid, formic acid, acetic acid, citric acid, oxalic acid, benzylic acid, glyoxylic acid, aspartic acid, benzoic acid, para-toluenesulfonic acid, fumaric acid, maleic acid or methanesulfonic acid.

Claim 4

A process for the preparation of the product of claim 1 which comprises reacting a compound of the formula: ##STR15## with bromine or iodine in the presence of an alkaline agent selected from the group consisting of alkaline hydroxide and alkaline alcoholate to obtain a product of the formula: ##STR16## treating said product with ethyl chloroformate in the presence of an alkaline agent selected from the group consisting of sodium carbonate, potassium carbonate, sodium bicarbonate, sodium hydroxide, potassium hydroxide, lithium hydroxide and tertiary amines to obtain a product of the formula: ##STR17## which is reacted with a benzyl halide in the presence of an alkaline agent selected from the group consisting of baryta, sodium hydride, sodium amide and sodium hydroxide to obtain the product of the formula: ##STR18## which is treated with acetic anhydride in acetic acid in the presence of a strong acid selected from the group consisting of mineral acids, organic acids, Lewis acids and sulfonic type ion exchange resins to obtain the product having the formula: ##STR19## which is then treated with anhydrous hydrochloric acid in the presence of acetyl chloride in an organic solvent to obtain a product of the formula: ##STR20## which is reacted with a product having the formula: ##STR21## in the presence of a catalyst to obtain a mixture of α and β anomers having the formula: ##STR22## the said mixture being reduced with hydrogen in the presence of a catalyst and then treated with an alkaline base selected from the group consisting of baryta, sodium hydroxide and potassium hydroxide, the product of formula I being separated from the mixture of anomers thus obtained.