The present invention provides a process for preparing highly pure Temozolomide base which includes recovery from the purification mother liquors by using an anionic exchange resin. By treating Temozolomide hydrochloride with a mixture of an organic acid, a water miscible organic solvent, and water, Temozolomide free base is obtained in an acidic medium. Due to the high sensitivity of Temozolomide to basic pH values the recovery-including process is especially advantageous because it enables obtaining high yields of highly pure Temozolomide base in acidic conditions. The process for producing Temozolomide base includes hydrolysis of the starting material 8-cyano-3-methyl-[3H]-imidazo[5,1-d]-tetrazin-4-one in acidic medium to obtain highly pure Temozolomide hydrochloride in high yield.
This invention relates to a novel process for the synthesis of Temozolomide, an antitumor compound, and analogs, and to intermediates useful in this novel process.
[EN] SYNTHESIS OF TEMOZOLOMIDE AND ANALOGS<br/>[FR] SYNTHÈSE DE LA TÉMOZOLOMIDE ET ANALOGUES
申请人:SCHERING CORP
公开号:WO2002057269A1
公开(公告)日:2002-07-25
This invention relates to a novel process for the synthesis of Temozolomide, an antitumor compound, and analogs, and to intermediates useful in this novel process.
Process for the preparation of temozolomide and analogs
申请人:Pathi Srinivas Laxminarayan
公开号:US20090326028A1
公开(公告)日:2009-12-31
A process for the preparation of compounds of formula IA, where R═CH
3
(i.e. temozolomide):
comprising diazotizing a compound of the formula IIA:
where in R is as defined above in the presence of at least one metal halide, an acid and a source of nitrous acid, followed by conversion of acidic solution containing temozolomide. The conversion can be carried out by a liquid-liquid extraction technique in a water immiscible solvent. The temozolomide may be further purified in an acetone-water mixture.
This invention relates to a novel process for the synthesis of Temozolomide, an antitumor compound, and analogs, and to intermediates useful in this novel process.