摘要:
The present invention relates to a new method of protection of the carboxy group in the chemistry of the compounds of .beta.-lactam type. According to such a method, the carboxy group is protected by being transformed into its corresponding phenyl-acetoxy-methyl ester, which is then removed by an enzymatic route by means of penicillinacylase.In particular, if the .beta.-lactam compound also bears a phenyl-acetamidic substitutent, this latter is simultaneously hydrolysed during the same step of removal of the carboxy function protecting group.
摘要:
Penicillin sulfoxide esters are reacted with an isocyanate to produce the corresponding (substituted)-2-carbamoyloxymethylpenam, the corresponding (substituted)-3-carbamoyloxycepham or the corresponding 3-methylcephem. The 6- or 7-side-chain of these products may be cleaved to give the corresponding 6-amino (penams) or 7-amino (cephams and cephems) compounds, and the latter may be reacylated to produce different 6-acyl-2-carbamoyloxymethyl penams, 7-acyl-3-carbamoyloxy cephams and 7-acyl-3-methylcephems. The substituent groups may be removed from the (substituted)-2-carbamoyloxypenams or the (substituted)-3-carbamoyloxycephams to give the corresponding free 2-carbamoyloxymethylpenams or 3-carbamoyloxycephams, respectively.
摘要:
Penicillin-1-oxides are rearranged into the corresponding 3-desacetosycephalosporin derivatives in an inert organic solvent in the concomitant presence of an acid catalyst and an organic sulfide in a good yield and with a high purity.
摘要:
A penicillin sulfoxide ester is reacted with an N-chloro halogenating agent at a temperature of from about 75.degree. C. to about 135.degree. C. to produce a novel 2-chlorosulfinylazetidin-4-one intermediate. The intermediate can be treated with stannic chloride to produce a 3-exomethylenecepham sulfoxide.
摘要:
A penicillin sulfoxide ester is reacted with an N-chloro halogenating agent at a temperature of from about 75.degree. C. to about 135.degree. C. and in the presence of an alkylene oxide and calcium oxide to produce a 2-chlorosulfinylazetidin-4-one intermediate. The intermediate, upon separation from the alkylene oxide, calcium oxide, and any conversion products of both the alkylene oxide and calcium oxide, can be treated with stannic chloride to produce a 3-exomethylenecepham sulfoxide.
摘要:
Conversion of penicillin sulfoxides to the corresponding 3-desacetoxycelphalosporins are carried out in high yield by heating, e.g. 80.degree.-130.degree. C, a solvent solution of the penicillin in the presence of a complex formed by a phosphite or phosphine amide with the salt of a strong acid and a nitrogenous base, e.g. alpha-picoline hydrobromide.One preferred amide is 2-piperidino-1,3,2-dioxaphospolane.
摘要:
A process for preparing cephalosporins of the structure: ##STR1## where R is any of hydrogen, C.sub.1 to C.sub.4 alkyl, t-butoxy, benzyloxy, cyano-methyl, thienyl-methyl, furyl-methyl, naphthyl-methyl, phenyl-methyl, phenoxy-methyl, phenoxy-isopropyl, pyridyl-4-thiomethyl and tetrazolyl-1-methyl;R.sub.1 is any of hydroxyl, C.sub.1 to C.sub.4 alkoxy, benzyloxy, p-methoxy- (or nitro-) benzyloxy, benzhydryloxy, triphenylmethoxy, phenacyloxy, p-halophenacyloxy and trichloroethoxy;Z is any of hydrogen, hydroxyl, --O--CO--C.sub.1 -C.sub.4 alkyl, --O--C.sub.1 -C.sub.4 alkyl, --Br, --I, --Cl, --N.sub.3, --NH.sub.2, --O--CO--CH.sub.3, --O--CO--NH.sub.2 and an -S-mononuclear nitrogen heterocyclic ring,By reacting compounds of the structure: ##STR2## IN WHICH R, R.sub.1, and Z are as above defined; R.sub.2 and R.sub.3 are the same or different and represent a C.sub.1 to C.sub.4 alkyl, a mononuclear aryl ring, --CN, a mononuclear heterocyclic ring or the radicals --COR.sub.4, COOR.sub.4, --PO(OR.sub.4).sub.2, --CO--NHR.sub.4 or R.sub.2 and R.sub.3 together may represent: ##STR3## where T represents >CH.sub.2, -N--R.sub.4 ; and R.sub.4 is lower alkyl, a mononuclear aryl ring or a mononuclear heterocyclic ring,Alone or as mixtures with each other in a suitable solvent at a temperature between -100 and +120.degree. C with a strong base to give compounds of formula I that are a mixture of .DELTA..sub.2 and .DELTA..sub.3 cephem-derivatives from which the .DELTA..sub.3 cephem derivatives can be obtained.
摘要:
The invention relates to compounds of the formula: ##STR1## wherein R stands forBenzyl,Phenoxymethyl,4-amino-4-carboxy-1-butyl,R.sup.3 o--, r.sup.3 s--, r.sup.3 r.sup.4 n-- whereinR.sup.3 is loweralkyl, aryl or arylloweralkyl,R.sup.4 is hydrogen or R.sup.3, andR.sup.2 is hydrogen or methoxy, andR.sup.1 is hydrogen or a cleavable radical such as--CH.sub.2 OCH.sub.3, loweralkyl, 2,2,2-trichloroethyl, benzyl, p-nitrobenzyl, benzhydryl, phenacyl or trimethylsilyl. The novel compounds are useful intermediates in the preparation of known penicillin and cephalosporin derivatives.
摘要:
A process is disclosed for preparing a cephalosporin of structure: ##STR1## where R is selected from the class consisting of hydrogen, alkyl having from 1 to 4 carbon atoms, cyano-methyl, thienyl-methyl, furyl-methyl, naphthyl-methyl, phenyl-methyl, phenoxy-methyl, phenyl-isopropyl, phenoxy-isopropyl, pyridyl-4-thiomethyl, tetrazolyl-1-methyl;R.sup.1 is selected from the class consisting of hydroxy, alkoxy having from 1 to 4 carbon atoms, trichloroethoxy, benzyloxy, p-methoxy-benzyloxy, p-nitrobenzyloxy, benzhydryloxy, triphenylmethoxy, phenacyloxy, p-halophenacyloxy; andZ is selected from the class consisting of hydrogen, hydroxy, --O--Alkyl, --O--CO--Alkyl, --Br, --I, --NH.sub.2, --O--COCH.sub.3, --O--CO--NH.sub.2, and an --S-mononuclear nitrogen heterocyclic ring,Wherein a compound of structure: ##STR2## where R, R.sup.1 and Z have the above meanings, is reacted with iodine in a suitable aqueous solvent at a temperature between 5.degree. and 80.degree. C in the presence of an oxide of a heavy metal or with a free radical initiator under the influence of light or heat, to give a compound of structure: ##STR3## in which R, R.sup.1 and Z have the above meanings, AND THE SAID INTERMEDIATE (II) is reacted in a suitable solvent with a compound selected from the class consisting of inorganic and organic bases to finally give the desired compound (III) which is then isolated and purified in per se known manner.
摘要:
Penicillin sulfoxides are converted to 3-halo-3-methyl-cepham-4-carboxylic acid esters and amides or the corresponding cephem derivatives by heating the penicillin sulfoxide precursor in a polyhaloalkane solvent to a temperature between 50.degree. to about 150.degree. C. in the presence of an equimolar amount of a neutral or basic catalyst, respectively. The catalysts employed are bases such as pyridine, picoline, lutidine, quinoline, isoquinoline, dimethylaniline or a quaternary ammonium salt. The 3-halo-cepham intermediates produced with a quaternary ammonium catalyst are dehydrohalogenated to afford known cephem derivatives or converted to the free 4-carboxylic acid and the alkali metal, alkaline earth metal or ammonium salts thereof to afford novel antibacterial agents.