An Improved Synthesis of
(4-{4-Hydroxy-3-isopropyl-5-[(4-nitrophenyl)ethynyl]benzyl}-3,5-dimethylphenoxy)acetic
Acid (NH-3)
作者:Kenneth Rehder、Madathil Gopinathan
DOI:10.1055/s-0028-1088041
日期:——
5-dimethylphenoxy)acetate in high yield. Saponification of the ester group, followed by the removal of the methoxymethyl group afforded (4-4-hydroxy-3-isopropyl-5-[(4-nitrophenyl)ethynyl]benzyl}-3,5-dimethylphenoxy)acetic acid (NH-3). coupling - Sonogashira coupling - palladium catalysis - 1-iodo-4-nitrobenzene - hydrolysis
将4- [3-碘-5-异丙基-4-(甲氧基甲氧基)苄基] -3,5-二甲基苯氧基}乙酸甲酯与(三甲基甲硅烷基)乙炔的Sonogashira偶联,以定量收率得到相应的(三甲基甲硅烷基)乙炔基衍生物。该中间体与1-碘-4-硝基苯的无铜钯催化偶联得到甲基(4- 3-异丙基-4-(甲氧基甲氧基)-5-[(4-硝基苯基)乙炔基]苄基} -3,5 -高产率的-二甲基苯氧基)乙酸酯。酯化酯基,然后除去甲氧基甲基,得到(4- 4-羟基-3-异丙基-5-[(4-硝基苯基)乙炔基]苄基} -3,5-二甲基苯氧基)乙酸(NH -3)。 偶联-Sonogashira偶联-钯催化-1-碘-4-硝基苯-水解