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Cefditoren pivoxil



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Cefditoren pivoxil

ME-1207, Spectracef, Meiact


  1. (-)-(6R,7R)-2,2-dimethylpropionyloxymethyl 7-((Z)-2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido)-3-((Z)-2-(4-methylthiazol-5-yl)ethenyl)-8-oxo-5-thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylate
  2. 7-(2-(2-aminothiazol-4-yl)-2-(methoxyimino)acetamido)-3-(2-(4-methylthiazol-5-yl)ethenyl)cephem-4-carboxylic acid pivaloyloxymethyl ester
  3. CDTR-PI
  4. cefditoren pivoxil
  5. ME 1207
  6. ME-1207
  7. Spectracef


Novel crystalline form of cefditoren pivoxil (first disclosed in EP175610). Represents Yungjin Pharma’s first interest in this API, which was developed and launched by Meiji Seika and previous licensee TAP Pharmaceuticals, and now marketed by Merus Labs, for treating chronic bronchitis and community acquired pneumonia caused by bacterial infections


Cefditoren is a third-generation cephalosporin antibiotic for oral use. It is commonly marketed under the trade name Spectracef by Vansen Pharma Inc.

Cefditoren is also marketed under the name Meiact by Meiji Seika Pharma Co., Ltd.[1]

Cefditoren pivoxil is a prodrug which is hydrolyzed by esterases during absorption, and the drug is distributed in the circulating blood as active cefditoren. Cefditoren is a cephalosporin with antibacterial activity against gram-positive and gram-negative pathogens. Cefditoren is effective against Staphylococcus aureus (methicillin-susceptible strains, including b-lactamase-producing strains), penicillin-susceptible strains of Staphylococcus aureus and Streptococcus pneumoniae, Streptococcus pyogenes, Haemophilus influenzae (including b-lactamase-producing strains), Haemophilus parainfluenzae (including b-lactamase-producing strains), Moraxella catarrhalis (including b-lactamase-producing strains), Streptococcus agalactiae, Streptococcus Groups C and G, and Streptococcus, viridans group (penicillin-susceptible and -intermediate strains).

Spectrum of bacterial susceptibility

Cefditoren has a broad spectrum of activity and has been used to treat bacterial infections of the skin and respiratory tract, including bronchitis, pneumonia, and tonsillitis. The following represents MIC susceptibility data for a few medically significant microorganisms.

  • Haemophilus influenzae: ≥0.063 – 0.25 μg/ml
  • Staphylcoccus aureus: 0.25 – >128 μg/ml (includes MRSA)
  • Streptococcus pyogenes: ≤0.004 – 2 μg/ml[2]

Cefditoren is a broad-spectrum antibiotic against Gram-negative and Gram-positive bacteria, but does not have antibacterial activity against Pseudomonas aeruginosa.[3]

Clinical use

Main article: Cephalosporin


Cefditoren is used to treat uncomplicated skin and skin structure infections, community-acquired pneumonia, acute bacterial exacerbation of chronic bronchitis, pharyngitis, and tonsillitis.


Cefditoren is available as 200- and 400-mg tablets. It can be formulated as the prodrug cefditoren pivoxil.

Chemical structure of cefditoren pivoxil

EP 0175610; ES 8704955; JP 1986178991; JP 1987019593
The reaction of 3-(chloromethyl)-7-(phenylacetamido)-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (I) with triphenylphosphine and NaI in acetone gives the corresponding phosphonium salt (II), which is condensed with 4-methylthiazole-5-carboxaldehyde (III) by means of NaHCO3 in dichloromethane affording 3-[2(Z)-(4-methylthiazol-5-yl)vinyl]-7-(phenylacetamido)-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (IV). The cleavage of the amido group of (IV) with PCl5 and pyridine yields the 7-amino compound (V), which is condensed with 2-(methoxyimino)-2-[2-(tritylamino)thiazol-4-yl]acetic acid (VI) by means of POCl3 in dichloromethane giving 3-[2(Z)-(4-methylthiazol-5-yl)vinyl]-7-[2(Z)-methoxyimino)-2-(2-tritylamino)thiazol-4-yl)acetamido]-3-cephem-4-carboxylic acid 4-methoxybenzyl ester (VII). The deprotection of (VII) with trifluoroacetic acid and anisole yields the free amino acid (VIII), which is finally esterified with iodomethyl pivalate (IX) in DMF.


  1. Meiact Full Description
  3. “Disease relevance of Cefditoren”. Retrieved June 24, 2014.
  4. Chem Pharm Bull 1992,39(9),2433
  5. J Antibiot 1990,43(8),1047
Synthesis Reference

Kiyoshi Yasui, Masahiro Onodera, Masamichi Sukegawa, Tatsuo Watanabe, Yuichi Yamamoto, Yasushi Murai, Katsuharu Iinuma, “Crystalline substance of cefditoren pivoxyl and the production of the same.” U.S. Patent US6294669, issued March, 1986.

Patent Submitted Granted
Therapy for Treating Resistant Bacterial Infections [US2009275552] 2009-11-05
Process for the preparation of thiazole intermediate [US6833459] 2003-10-30 2004-12-21
Nanoparticulate and Controlled Release Compositions Comprising Cefditoren [US8119163] 2008-11-13 2012-02-21

External links

Systematic (IUPAC) name
(7R)-7-((Z)-2-(2-Aminothiazol-4-yl)-2-(methoxyimino)acetamido)-3-((Z)-2-(4-methylthiazol-5-yl)vinyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
Clinical data
Trade names Spectracef
AHFS/ monograph
MedlinePlus a605003
Legal status
CAS number 104145-95-1 
ATC code J01DD16
PubChem CID 9870843
DrugBank DB01066
ChemSpider 8046534 Yes
Chemical data
Formula C19H18N6O5S3 
Mol. mass 506.58 g/mol





WO-2014189308, Yungjin Pharmaceutical Co Ltd


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DR ANTHONY MELVIN CRASTO, Born in Mumbai in 1964 and graduated from Mumbai University, Completed his Ph.D from ICT, 1991,Matunga, Mumbai, India, in Organic Chemistry, The thesis topic was Synthesis of Novel Pyrethroid Analogues, Currently he is working with GLENMARK PHARMACEUTICALS LTD, Research Centre as Principal Scientist, Process Research (bulk actives) at Mahape, Navi Mumbai, India. Total Industry exp 30 plus yrs, Prior to joining Glenmark, he has worked with major multinationals like Hoechst Marion Roussel, now Sanofi, Searle India Ltd, now RPG lifesciences, etc. He has worked with notable scientists like Dr K Nagarajan, Dr Ralph Stapel, Prof S Seshadri, Dr T.V. Radhakrishnan and Dr B. K. Kulkarni, etc, He did custom synthesis for major multinationals in his career like BASF, Novartis, Sanofi, etc., He has worked in Discovery, Natural products, Bulk drugs, Generics, Intermediates, Fine chemicals, Neutraceuticals, GMP, Scaleups, etc, he is now helping millions, has 9 million plus hits on Google on all Organic chemistry websites. His friends call him Open superstar worlddrugtracker. His New Drug Approvals, Green Chemistry International, All about drugs, Eurekamoments, Organic spectroscopy international, etc in organic chemistry are some most read blogs He has hands on experience in initiation and developing novel routes for drug molecules and implementation them on commercial scale over a 30 year tenure till date Dec 2017, Around 35 plus products in his career. He has good knowledge of IPM, GMP, Regulatory aspects, he has several International patents published worldwide . He has good proficiency in Technology transfer, Spectroscopy, Stereochemistry, Synthesis, Polymorphism etc., He suffered a paralytic stroke/ Acute Transverse mylitis in Dec 2007 and is 90 %Paralysed, He is bound to a wheelchair, this seems to have injected feul in him to help chemists all around the world, he is more active than before and is pushing boundaries, He has 9 million plus hits on Google, 2.5 lakh plus connections on all networking sites, 50 Lakh plus views on dozen plus blogs, He makes himself available to all, contact him on +91 9323115463, email, Twitter, @amcrasto , He lives and will die for his family, 90% paralysis cannot kill his soul., Notably he has 19 lakh plus views on New Drug Approvals Blog in 216 countries...... , He appreciates the help he gets from one and all, Friends, Family, Glenmark, Readers, Wellwishers, Doctors, Drug authorities, His Contacts, Physiotherapist, etc

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