摘要:
A method of crystallizing (1R,5S,6S)-2-[(6,7-dihydro-5H-pyrazolo[1,2-a][1,2,4]triazolium-6-yl)]thio-6-[(R)-1-hydroxyethyl]-1-methyl-carbapenem-3-carboxylate (hereinafter simply referred to as L-627), which is characterized by maintaining an aqueous solution of L-627 at temperatures ranging from the eutectic temperature of the solution to temperatures lower than 0° C. The method provides some advantages that loss of L-627 accompanied by crystallization is less, number of steps in the preparation of vial formulations is less and maintenance of these steps under sterile and dust-free conditions can be performed easily, dispensation of the drug can be conducted with quantitative accuracy, and the crystals dissolve in a solvent promptly at the time of use.
摘要:
A carbapenem derivative having an R-configuration at the 5-position, represented by general formula (I), and optically active pyrrolidine derivatives represented by general formulae (XI) and (XII), all of these compounds serving as the intermediate for the synthesis of carbapenems as β-lactam antibiotics. In formula (I) R1 represents hydrogen or an organic group; and R2 represents hydrogen or a carboxyl protective group. In formulae (XI) and (XII) R1 represents benzyl; R2 represents alkyl; R3 represents alkyl, benzyl or allyl; R4 represents hydrogen, alkyl, vinyl, phenyl, benzyl or a heterocyclic group containing 1 to 4 nitrogen or/and oxygen atoms; and R5 represents hydrogen or methyl.
摘要:
The invention relates to new 2-substituted alkyl-3-carboxy carbapenems having the formula: with R 1 , R 2 , R 3 , X and Y defined in the specification as antibiotics and beta lactamase inhibitors produced by a novel Michael addition-elimination reaction of a substituted allyl azetidinone in the reaction shown: with Q defined in the specification.
摘要:
Novel and improved simple process for preparing carbapenem compound, (1R,5S,6S)-2-[(6,7-dihydro-5H-pyrazolo [1,2-a][1,2,4]triazolium-6-yl)]thio-6-[(R)-1-hydroxyethyl]-1-methyl-carbapenem-3-carboxylate represented by the following formula: This compound may be prepared by using a mercapto reagent, 6,7-dihydro-6-mercapto-5H-pyrazolo[1,2-a][1,2,4]triazolium derivative of the following formula:
摘要:
Verbindung I erhält man durch Umsetzung von Verbindung IV mit Verbindung V bei Temperaturen von 50 bis 180°C in einem geeigneten organischen Lösungsmittel.
in which R₁ represents a hydrogen atom or a hydroxyl protecting group, R₂ represents a hydrogen atom or a carboxyl protecting group, and R₃ represents the group N(R₄)-CH=NR₅ wherein R₄ represents a hydrogen atom and R₅ represents a hydrogen atom; and salts, metabolically labile esters and solvates thereof and a process for their production. The compounds of formula (I) are either antibacterial agents and or useful intermediates for the preparation of antibacterial agents.
R² is hydroxy(lower)alkyl or protected hydroxy(lower)alkyl, R³ is hydrogen or lower alkyl, R⁶ is an organic group, and R is hydrogen, or certain groups, and processes for preparing them. The invention also relates to industrially excellent processes for preparing carbapenem derivatives having the formula
in which
R¹ is carboxy or protected carboxy, R² is hydroxy(lower)alkyl or protected hydroxy(lower)alkyl, R³ is hydrogen or lower alkyl, and R⁶ is an organic group, or salts thereof, which are useful as antimicrobial agents.
摘要:
The invention relates to new 2-substituted alkyl-3-carboxy carbapenems having the formula: with R 1 , R 2 , R 3 , X and Y defined in the specification as antibiotics and beta lactamase inhibitors produced by a novel Michael addition-elimination reaction of a substituted allyl azetidinone in the reaction shown: with Q defined in the specification.