Efficient Synthesis of the Nucleus of Atorvastatin Calcium
作者:Yuzhi Xing、Shipeng Chen、Yingtao Zhou、Na Liu、Ligong Chen、Yang Li
DOI:10.1080/00397911.2015.1111382
日期:2015.12.17
(lit. 51.4%) from methylisopropylketone via five steps. Two impurities generated by the aldol condensation of methylisopropylketone were identified by gas chromatography–mass spectrometry and their generation can be inhibited by reducing the mixing time of methylisopropylketone and NaH. One oxybromination protocol with hydrogen peroxide was employed to make the best of bromine. A debromination
摘要 通过对相关反应的修饰,成功建立了阿托伐他汀钙母核的有效合成路线。在优化的条件下,通过五步从甲基异丙基酮中以61.2%的产率(lit.51.4%)得到化合物1。通过气相色谱-质谱法鉴定了甲基异丙基酮醛醇缩合产生的两种杂质,它们的产生可以通过减少甲基异丙基酮和 NaH 的混合时间来抑制。使用一种含过氧化氢的氧溴化方案来充分利用溴。通过1H NMR、13C NMR和高分辨质谱法分离并证实了脱溴副产物,并讨论了其产生机理。杂质可以通过保护反应避光来抑制,并且很容易通过重结晶去除。图形概要