C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 401/00 (2006.01) C07J 9/00 (2006.01) C07J 71/00 (2006.01)
Patent
CA 2259339
A crystal of the compound of the structural formula (I); crystals of vitamin D derivatives prepared by purifying unpurified or roughly purified vitamin D derivatives by reversed phase chromatography and crystallizing the purified derivatives in organic solvents, novel by-products formed in the synthesis of vitamin D derivatives; and a process for the purification of vitamin D derivatives or intermediates thereof, which enables the constant and mass supply of high-purity vitamin D derivatives, particularly ED-71.
L'invention concerne un cristal du composé de la formule structurale (I); des cristaux de dérivés de vitamine D préparés par purification de dérivés de vitamines D non purifiés ou bien purifiés grossièrement, par chromatographie à phase inversée, et cristallisation des dérivés purifiés dans des solvants organiques; de nouveaux sous-produits formés lors de la synthèse de dérivés de vitamine D; et un procédé pour la purification de dérivés de vitamine D ou d'intermédiaires de ceux-ci, lequel permet l'apport constant et massif de dérivés de vitamines D de haute pureté, notamment de ED-71.
Chugai Seiyaku Kabushiki Kaisha
Norton Rose Or S.e.n.c.r.l.,s.r.l./llp
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