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Showing posts with label Nuuk. Show all posts
Showing posts with label Nuuk. Show all posts

Thursday, 7 July 2016

Rifaximin

Rifaximin.png

Rifaximin;
Rifaxidin; Rifacol; Xifaxan; Normix; Rifamycin L 105;L 105 (ansamacrolide antibiotic), L 105SV
(2S,16Z,18E,20S,21S,22R,23R,24R,25S,26S,27S,28E)-5,6,21,23,25-pentahydroxy-27-methoxy-2,4,11,16,20,22,24,26-octamethyl-2,7-(epoxypentadeca-[1,11,13]trienimino)benzofuro[4,5-e]pyrido[1,2-á]-benzimidazole-1,15(2H)-dione,25-acetate
 CAS 80621-81-4,  4-Deoxy-4-methylpyrido[1,2-1,2]imidazo[5,4-c]rifamycin SV,
4-Deoxy-4′-methylpyrido[1′,2′-1,2]imidazo[5,4-c]rifamycin SV, Rifacol
C43H51N3O11
Molecular Weight: 785.87854 g/mol


XIFAXAN tablets for oral administration are film-coated and contain 200 mg or 550 mg of rifaximin.

See synthesis
http://www.allfordrugs.com/2016/07/06/rifaximin/



SPECTRA
LINK IS CLICK
STR1
APT 13C NMR RIFAXIMIN
STR1
1H NMR PARTIAL
STR1
IR

STR1

Direct infusion mass analysis ESI (+)


STR1
STR1
IH NMR
STR1
  • [-]ESI    FRAG PATHWAY

PATENT

Patent US20130004576
Rifaximin (INN; see The Merck Index, XIII Ed., 8304, CAS no. 80621-81-4), IUPAC nomenclature (2S,16Z,18E,20S,21S,22R,23R,24R,25S,26S,27S,28E)-5,6,21,23,25 pentahydroxy-27-methoxy-2,4,11,16,20,22,24,26-octamethyl-2,7-(epoxypentadeca-(1,11,13)trienimino)benzofuro(4,5-e)pyrido(1,2,-a)benzimidazole-1,15(2H)-dione,25-acetate) is a semi-synthetic antibiotic belonging to the rifamycin class of antibiotics. More precisely rifaximin is a pyrido-imidazo rifamycin described in the Italian patent IT 1154655, whereas the European patent EP 0161534 discloses a process for rifaximin production using rifamycin O as starting material (The Merck Index, XIII Ed., 8301).
U.S. Pat. No. 7,045,620, US 2008/0262220, US 7,612,199, US 2009/0130201 and Cryst. Eng. Comm., 2008, 10 1074-1081 (2008) disclose new forms of rifaximin.
WO 2008/035109 A1 discloses a process to prepare amorphous rifaximin, which comprises reaction of rifamycin S with 2-amino-4 picoline in presence of organic solvent like dichloromethane, ethylacetate, dichloroethylene, chloroform, in an inert atmosphere. When water is added to the reaction mixture, a solid precipitate corresponding to amorphous rifaximin is obtained.
The process described in this document can be assimilated to a crash precipitation, wherein the use of an anti-solvent causes the precipitation of rifaximin without giving any information about the chemical physical and biological characteristics of the rifaximin obtained.
WO 2009/108730 A2 describes different polymorphous forms of rifaximin and also amorphous forms of rifaximin. Amorphous forms are prepared by milling and crash precipitation and with these two different methods the amorphous rifaximin obtained from these two different processes has the same properties.

FIG. 4: 13C-NMR spectrum of rifaximin obtained by spray drying process.


FIG. 5: FT-IR spectrum of rifaximin obtained by spray drying process.


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See synthesis
http://www.allfordrugs.com/2016/07/06/rifaximin/