[EN] O-SUBSTITUTED (2R,3R)-3-(3-HYDROXYPHENYL)-2-METHYL-4-PENTENOIC ACIDS AND A METHOD OF OBTAINING THE SAME<br/>[FR] ACIDES (2R, 3R)-3-(3-HYDROXYPHÉNYLE)-2-MÉTHYL-4-PENTÉNOÏQUES O-SUBSTITUÉS ET LEUR PROCÉDÉ D'OBTENTION
申请人:ZENTIVA KS
公开号:WO2012089181A1
公开(公告)日:2012-07-05
The compounds of general formula II are new and represent important intermediates in the synthesis of tapentadol. In the synthesis of tapentadol of formula I and its pharmaceutically acceptable salts, O-protected (2R,3R)-acids of general formula II, in step A, are reacted in an inert organic solvent with an activating agent, optionally in presence of a catalyst or a base; in step B, the obtained compounds of general formula V, wherein R has the above mentioned meaning and X stands for chlorine or alkoxycarbonyloxyl group O-CO-OR1 or pivaloyloxyl O-CO-t-Bu group, wherein R1 is methyl or ethyl, are reacted with dimethylamine or its salts optionally in presence of a base; in step C, the obtained N, N-dimethylamides of general formula VI, wherein R has the above mentioned meaning, are reduced by means of hydride agents in a suitable solvent; in step D, the produced alkeneamines of general formula VII, wherein R has the above mentioned meaning, are hydrogenated on a metal catalysts in a suitable solvent; and, finally, in step E, the produced alkaneamines of general formula VIII, wherein R has the above mentioned meaning, are O-dealkylated by means of dealkylating agents, and, if required, the obtained tapentadol is converted by the action of a pharmaceutically acceptable acid to respective salts, e.g. hydrochloride.
通用公式II的化合物是新的,并在tapentadol合成中代表重要的中间体。在通用公式II的O-保护(2R,3R)-酸中,通过步骤A,在惰性有机溶剂中与活化剂反应,可选择性地在催化剂或碱的存在下;在步骤B中,所得到的通用公式V的化合物,其中R具有上述所述含义,X代表氯或烷氧羰氧基O-CO-OR1或戊酰氧基O-CO-t-Bu基团,其中R1为甲基或乙基,与二甲胺或其盐反应,可选择性地在碱的存在下;在步骤C中,所得到的通用公式VI的N,N-二甲基酰胺,其中R具有上述所述含义,通过适当溶剂中的氢化剂还原;在步骤D中,所得到的通用公式VII的烯胺,其中R具有上述所述含义,通过金属催化剂在适当溶剂中进行氢化;最后,在步骤E中,所得到的通用公式VIII的烷胺,其中R具有上述所述含义,通过去烷基化剂进行O-去烷基化,并且如果需要,通过药学上可接受的酸作用将得到的tapentadol转化为相应的盐,例如盐酸盐。