申请人:KUTNER Andrzej
公开号:US20100222614A1
公开(公告)日:2010-09-02
A process for the preparation of calcipotriol at least including: (a) reacting a C-22 phenylsulfonyl derivative of cholecalciferol of Formula 2, wherein R
1
and R
2
are the same or different and represent hydroxyl protecting groups, with a silyl derivative of alfa-hydroxy aldehyde of Formula 3, wherein R
3
represents silyl group of formula Si(R
4
)(R
5
)(R
6
), where R
4
-R
6
are the same or different and represent C
1-6
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.
一种制备骨化三醇的方法,至少包括以下步骤:(a)将式子2的C-22苯基磺酰基衍生物的R1和R2相同或不同,分别代表羟基保护基,与式子3的α-羟基醛的硅烷衍生物反应,其中R3代表公式Si(R4)(R5)(R6)的硅烷基,其中R4-R6相同或不同,代表C1-6烷基或苯基,在无水溶剂中存在强有机碱,随后还原得到的α-羟基磺酸盐的非对映异构体混合物与汞齐还原,去除羟基保护基,并纯化产物。该方法导致含有少于0.3%的(22Z)-异构体的骨化三醇的形成。所得到的骨化三醇不含有汞痕迹。