Sn(OTf)2-promoted aldolreaction of α-bromo ketones with aldehydes giving α-bromo-β-stannyloxy ketones which were then converted to titaniumenolates on treatment with low-valent titanium. Double aldols were formed by subsequent reaction of the above titaniumenolates with aldehydes in one-pot procedure. Further, small and medium-sized carbocyclic compounds whose ring skeletons were composed of double aldol structure
双醛醇反应在酮的一个 α-碳上立体选择性地进行,得到 α-(1-羟烷基)-β-羟烷基酮 (双醛醇),通过以下三种方法收率良好:i) 三氟甲磺酸锡 (II) 介导在叔胺存在下醛与 β-羟基酮(单羟醛)的羟醛反应,ii) 碘化钐 (II) 介导的醛与烷基或芳基环氧乙烷基酮的羟醛反应,iii) Sn(OTf)2-促进α-溴酮与醛的羟醛反应生成 α-溴-β-甲锡烷氧基酮,然后在用低价钛处理后转化为钛烯醇化物。双羟醛是通过上述钛烯醇化物与醛在一锅法中的后续反应形成的。更多,