申请人:AKZO N.V.
公开号:EP0069424A1
公开(公告)日:1983-01-12
There is provided a process for the selective reduction of 8,14-seco-1,3,5(10),9(11)-oestratetraene-14,17-diones resulting in the corresponding 14,17-ketols with a higher enantioselectivity than obtainable hitherto and a high diastereoselectivity (trans/cis- or cis/trans-ratio) by using a chiral reducing agent consisting of a complex alkali metal aluminiumhydride having the formula
M Al(OR1)m(OR2)nH4-m-n, in which M represents an alkali metal;
OR is derived from the chiral alcohol (+)-(2S,3R)-4-dimethylamino-3-methyl-1,2-diphenyl-2-butanol or the enantiomer thereof with the (-)-(2R,3S)-configuration;
OR2 is derived from an achiral organic hydroxy compound having 1-10 C-atoms;
m = 1-3; n = 0-2; and m + n ≤ 3.
提供了一种选择性还原 8,14-seco-1,3,5(10),9(11)-雌甾-14,17-四烯-14,17-二酮的工艺,该工艺通过使用一种手性还原剂得到相应的 14,17-酮,该还原剂的对映体选择性比迄今为止所能得到的要高,并且具有很高的非对映选择性(反式/顺式或顺式/反式比),该手性还原剂由具有以下式子的复合碱金属铝酸酐组成
M Al(OR1)m(OR2)nH4-m-n,其中 M 代表碱金属;
OR 源自手性醇 (+)-(2S,3R)-4-dimethylamino-3-methyl-1,2-diphenyl-2-butanol 或其具有 (-)-(2R,3S)-configuration 的对映体;
OR2 来自具有 1-10 个 C 原子的非手性有机羟基化合物;
m = 1-3;n = 0-2;且 m + n ≤ 3。