摘要:
A crystalline complex of penicillin G 1(S)-oxide and acetone is described, the complex being a useful intermediate in the preparation of other penicillins and cephalosporins. The complex may be prepared by contacting the oxide or a salt or other complex thereof with acetone.
摘要:
This invention concerns 6-(1,4-cyclohexadienylacylamido) penicillanic acids and the salts thereof which have potent antibiotic activity particularly against penicillin resistant staphylococci.
摘要:
The invention mainly pertains to a process for obtaining Ochropamine which comprises the steps of exhausting a vegetal drug by means of a solvent in an alkaline environment, separating the bases contained in the solvent by means of acid water, treating said acid water with a view to extracting therefrom the total alkaloids, and isolating the Ochropamine by chromatography, characterized in that said vegetal drug is the Cabucala Striolata Caudata.
AND THE NON-TOXIC, CATIONIC SALTS THEREOF WHEREIN: R1 IS THIENYL, PHENYL AND SUBSTITUTED PHENYL; R2 IS HYDROGEN AND ACYLOXY LOWER ALKYL; R3 IS HYDROGEN, LOWER ALKYL AND BENZYL; R4 IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND CARBOBENZOXY; AND N IS 0 OR 1.
摘要:
6-(N-(substituted-imidoyl)aminoacetamido)penicillanic acids and their salts are valuable as antibacterial agents, nutritional supplements in animal feeds, therapeutic agents in poultry and animals, including man, and are especially useful in the treatment of infectious diseases caused by Gram-positive and certain Gram-negative bacteria, most particularly those caused by the Proteus genus. 6-(N-(Phenylacetimidoyl)aminoacetamido)penicillanic acid, a preferred embodiment of the invention, is prepared by Raney nickel hydrogenation (50 p.s.i., R.T.) of an aqueous solution of sodium 6-(3-benzyl-1,2,4oxadiazole-5-one-4-acetamido)penicillanate which is prepared in turn by reaction of 6-aminopenicillanic acid with 3-benzyl-1,2,4oxadiazole-5-one-4-acetyl chloride.
摘要:
Small crystals are made by mixing a solution of a desired substance with an anti-solvent in a fluidic vortex mixer in which the residence time is less than 1s, for example 10 ms. The liquid within the fluidic vortex mixer (12) is subjected to high intensity ultrasound from a transducer (20, 22). The solution very rapidly becomes supersaturated, and the ultrasound can induce a very large number of nuclei for crystal growth. Small crystals, for example less than 5 μm, are formed. The resulting suspension is treated so as to add or remove ingredients, and then spray dried using an atomiser tuned to create small droplets in such a way that each droplet should contain not more than one crystal. Crystal agglomeration is hence prevented.
摘要:
Compounds of formula I: 1 wherein R1, R2, R3, R4 and n have any of the values defined in the specification, and their pharmaceutically acceptable salts, are useful for inhibiting null-lactamase enzymes, for enhancing the activity of null-lactam antibiotics, and for treating null-lactam resistant bacterial infections in a mammal. The invention also provides pharmaceutical compositions, processes for preparing compounds of formula I, and novel intermediates useful for the synthesis of compounds of formula I.