Abstract With iodobenzene diacetate [PhI(OAc)2] as the oxygen source, manganese(III) porphyrin complexes exhibit remarkable catalytic activity toward the selective oxidation of alkenes and activated hydrocarbons. Conspicuous is the fact that the readily soluble PhI(OAc)2 in the presence of a small amount of water is more efficient than the commonly used PhIO and other oxygen sources under same catalytic
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,