合成路线:B) The reaction of 2-(hydroxyimino)-2-[5-(triphenylmethylamino)-1,2,4-thiadiazol-3-yl]acetic acid ethyl ester (XVIII) with bromofluoromethane and K2CO3 gives the corresponding fluoromethyl derivative (XIX),which is hydrolyzed with NaOH in ethanol - water to the corresponding acetic acid (XX).The reaction of (XX) with POCl3 in THF affords the corresponding acyl chloride (XXI),which is condensed with 7-amino-3-[3-chloro-1(Z)-propenyl]-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (XXII) to afford the 7-acetamido-cephem compound (XXIII).The reaction of (XXIII) with NaI in refluxing acetone gives the corresponding iodopropenyl derivative (XXIV),which is finally condensed with N-ethyl-N-methylglycinamide (XIV) and deprotected with trifluoroacetic acid in anisole.
参考文献标题:Synthesis and structure-activity relationships of fluoromethoxyimino containing cephems; E1077,a novel parenteral cephem
文献作者:Naito,T.; Kai,Y.; Kamiya,T.; et al.
参考来源:30th Intersci Conf Antimicrob Agents Chemother (Oct 21-24,Atlanta) 1990,Abst 447
合成路线:This compound can be obtained by two related ways:A) By condensation of 2-(5-amino-1,2,4-thiadiazol-3-yl)-2(Z)-(fluoromethoxyimino)acetyl chloride (VIII) with (6R,7R)-7-amino-3-[3-[N-(carbamoylmethyl)-N-ethyl-N-methylammonio]- 1(E)-propenyl]-3-cephem-4-carboxylate (XVII) by means of sodium acetate in methanol - water.The starting products (VIII) and (XVIII) are obtained as follows:1) The reaction of 2-cyano-2-(hydroxyimino)acetamide (I) with bromofluoromethane by means of K2CO3 in DMSO - DMF gives 2-cyano-2-(fluoromethoxyimino)acetamide (II),which is dehydrated with refluxing POCl3 to yield 2-(fluoromethoxyimino)propanedinitrile (III).The amonolysis of (III) with aqueous NH3 and ethanol affords 2-cyano-2-(fluoromethoxyimino)acetamidine (IV),which is chlorinated with aqueous NaOCl in methanol - ether giving 2-(N2-chloroamidino)-2-(fluoromethoxyimino)acetonitrile (V).The hydrolysis of (V) with H2O2 and HCl in water yields 2-(N2-chloroamidino)-2-(fluoromethoxyimino)acetic acid (VI),which is cyclized with potassium thiocyanate by means of triethylamine in methanol to afford 2-(5-amino-1,2,4-thiadiazol-3-yl)-2(Z)-fluoromethoxyimino)acetic acid (VII).Finally,this compound is converted into the desired acyl chloride (VIII) by reaction with PCl5 in dichloromethane.2) The reaction of 3-(chloromethyl)-7beta-(2-phenylacetamido)-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (IX) with triphenylphosphine and sodium iodide in acetone gives the corresponding phosphonium salt (X),which is condensed with chloroacetaldehyde (XI) to yield the 3-chloropropenyl derivative (XII).The reaction of (XII) with NaI in dry acetone affords the corresponding iodo derivative (XIII),which is condensed with N-ethyl-N-methylglycinamide (XIV) to give 3-[3-[N-(carbamoylmethyl)-N-ethyl-N-methylammonio]-1(E)-propenyl]-7beta-(phenylacetamido)-3-cephem-4-carboxylic acid 4-methoxybenzyl ester iodide (XV).The partial hydrolysis of (XV) with trifluoroacetic acid in anisole yields the inner salt (XVI),which is treated with Carrier-Fixed-Penicillin G Amidase in water at pH 7.5-8.0 to obtain the desired 7-amino derivative (XVII).
合成路线:B) The reaction of 2-(hydroxyimino)-2-[5-(triphenylmethylamino)-1,2,4-thiadiazol-3-yl]acetic acid ethyl ester (XVIII) with bromofluoromethane and K2CO3 gives the corresponding fluoromethyl derivative (XIX),which is hydrolyzed with NaOH in ethanol - water to the corresponding acetic acid (XX).The reaction of (XX) with POCl3 in THF affords the corresponding acyl chloride (XXI),which is condensed with 7-amino-3-[3-chloro-1(Z)-propenyl]-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (XXII) to afford the 7-acetamido-cephem compound (XXIII).The reaction of (XXIII) with NaI in refluxing acetone gives the corresponding iodopropenyl derivative (XXIV),which is finally condensed with N-ethyl-N-methylglycinamide (XIV) and deprotected with trifluoroacetic acid in anisole.
参考文献标题:E-1077
文献作者:Prous,J.; Castar,J.
参考来源:Drugs Fut 1992,17(7),543
合成路线:The synthesis of [14C]-labeled E-1077 has been described:The cyclization of 2-(N-chloroamidino)-2(Z)-(fluoromethoxyimino)acetic acid (I) with [14C]-potassium thiocyanate (II) in methanol gives labeled 2-(5-amino-1,2,4-thiadiazol-3-yl)-2(Z)-(fluoromethoxyimino)acetic acid (III),which is then condensed with (6R,7R)-7-amino-3-[3-[N-(carbamoylmethyl)-N-ethyl-N-methylammonium]-1(E)-propenyl]-3-cephem-4-carboxylate (IV) by means of POCl3 in DMF.
参考文献标题:Synthesis of [C-14]E1077,a novel parenteral cephalosporin antibiotic
文献作者:Kai,Y.; Chiku,S.
参考来源:J Label Compd Radiopharm 1994,34(11),1069
合成路线:The synthesis of [14C]-labeled cefluprenam has been described:The condensation of methyl ethylamine (I) with aqueous formaldehyde (II) and [14C]-labeled potassium cyanide (III) by means of HCl gives labeled 2-(N-ethyl-N-methylamino)acetonitrile (IV),which by partial hydrolysis with concentrated H2SO4 is converted to the acetamide (V).Finally,this compound is condensed with (6R,7R)-7-[2-(5-amino-1,2,4-thiadiazol-3-yl)-2(Z)-(fluoromethoxyimino)a cetamido]-3-[3-chloro-1(E)-propenyl]-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (VI) by means of NaI in DMF,and deprotected with trifluoroacetic acid-anisole.
参考文献标题:Synthesis of C-14-labelled cefluprenam (E1077),a novel parenteral cephalosporin antibiotic
文献作者:Sato,N.; Kai,Y.; Shemilt,G.I.; Chiku,S.
参考来源:J Label Compd Radiopharm 1995,36(2),173
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