An improved process for tert-butanesulfinyl ketimines formation using titanium(IV) alkoxides is described. This new protocol gives better results especially for sterically hindered ketones compared to classical conditions where titanium(IV) isopropoxide is found to be only moderately effective. We found that removal of isopropanol or ethanol from the reaction mixture either under a nitrogen flow or
描述了使用醇
钛(IV)形成叔
丁烷亚磺酰基酮
亚胺的改进方法。与发现
异丙醇钛(IV)仅适度有效的经典条件相比,此新方案可提供更好的结果,尤其是对于位阻酮。我们发现,在氮气流或真空下从反应混合物中除去
异丙醇或
乙醇可显着提高反应速率,转化程度和反应产率。已经在文献中报道的几种基质上举例说明了该方法是困难的。