Reduction of Ethyl Benzoylacetate and Selective Protection of 2-(3-Hydroxy-1-phenylpropyl)-4-methylphenol: A New and Facile Synthesis of Tolterodine
作者:Kathlia A. De Castro、Jungnam Ko、Daejong Park、Sungdae Park、Hakjune Rhee
DOI:10.1021/op7001134
日期:2007.9.1
A new and facile synthesis of tolterodine using ethyl benzoylacetate as the starting material was developed. Reduction using sodium borohydride in methanol followed by Friedel–Crafts alkylation utilizing FeCl3·6H2O as catalyst lead to the known 2-(3-hydroxy-1-phenylpropyl)-4-methylphenol intermediate. Consecutive protection of phenolic OH with p-toluenesulfonyl chloride via two-phase reaction and conversion
以苯甲酰乙酸乙酯为起始原料,开发了一种新的简便的托特罗定合成方法。使用甲醇中的硼氢化钠进行还原,然后使用FeCl 3 ·6H 2 O作为催化剂进行Friedel-Crafts烷基化反应,生成已知的2-(3-羟基-1-苯基丙基)-4-甲基苯酚中间体。通过两相反应用对-甲苯磺酰氯连续保护酚羟基,并使用对硝基苯磺酰氯将脂肪族羟基转化为羟基,有助于直接取代二异丙胺。在对甲苯磺酰基同时去保护后,通过使用l的拆分,获得光学纯的(R)-托特罗定· l-酒石酸酯-酒石酸,纯度为99.99%。