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    • 4. 发明授权
    • Process for the preparation of calcipotriol
    • 卡泊三醇的制备方法
    • US07829746B2
    • 2010-11-09
    • US12685256
    • 2010-01-11
    • Andrzej KutnerMichal ChodynskiKinga LeszczynskaWieslaw SzelejewskiHanna Fitak
    • Andrzej KutnerMichal ChodynskiKinga LeszczynskaWieslaw SzelejewskiHanna Fitak
    • C07C35/00
    • C07C401/00C07C2601/02Y02P20/55
    • A process for the preparation of calcipotriol at least including: (a) reacting a C-22 phenylsulfonyl derivative of cholecalciferol of Formula 2, wherein R1 and R2 are the same or different and represent hydroxyl protecting groups, with a silyl derivative of alfa-hydroxy aldehyde of Formula 3, wherein R3 represents silyl group of formula Si(R4)(R5)(R6), where R4-R6 are the same or different and represent C1-6 alkyl or phenyl groups, in the presence of a strong organic base in an aprotic solvent, followed by reductive desulfonation of the obtained diastereomeric mixture of alfa-hydroxysulfones with sodium amalgam, removal of the hydroxyl protecting groups, and purification of the product. The process leads to the formation of calcipotriol containing less than 0.3% of the (22Z)-isomer. The obtained calcipotriol is free of mercury traces.
    • 一种制备卡泊三醇的方法,至少包括:(a)使式2的胆钙化甾醇的C-22苯基磺酰基衍生物与其中R 1和R 2相同或不同并代表羟基保护基,与α-羟基的甲硅烷基衍生物 醛,其中R 3表示式Si(R 4)(R 5)(R 6)的甲硅烷基,其中R 4 -R 6相同或不同,表示C 1-6烷基或苯基,在强有机碱存在下 在非质子溶剂中,然后将所得到的α-羟基磺酰胺与汞齐汞合物的非对映异构体混合物还原脱磺化,除去羟基保护基团并纯化产物。 该方法导致含有小于0.3%的(22Z)异构体的卡泊三醇的形成。 得到的卡泊三醇没有汞痕迹。