在叔丁醇钾和有机分子作为催化剂存在的情况下,已经开发出一种涉及邻卤代N芳基苄胺的“无过渡金属”分子内联芳基偶合的方法。该反应似乎通过KO t Bu促进的分子内均溶芳族取代(HAS)进行。有趣的是,这种联芳基偶合在叔丁醇钾作为唯一促进剂的情况下也起作用。在进一步扩展我们的方法时,我们发现N-酰基2-溴-N-芳基苄胺经历了一锅N-脱保护/联芳基偶联,然后进行氧化,因此提供了通往菲啶和苯并[ c ]菲啶骨架的快速途径。该策略已被应用于简明的金莲花科生物碱的合成。oxoassoanine(1B),anhydrolycorinone(1D),5,6- dihydrobicolorine(2D),trispheridine(2B),和苯并[ C ^ ]菲啶生物碱dihydronitidine(图3b),dihydrochelerythidine(3D),dihydroavicine(3F),norni
Abstract An efficient method of synthesis of 1‐tetralones has been achieved featuring a Stille cross‐coupling reaction as the key step.
摘要 以Stille交叉偶联反应为关键步骤,实现了一种有效的1-四氢萘酮合成方法。
Highly Regio- and Diastereoselective Synthesis of CF<sub>3</sub>-Substituted Lactones <i>via</i> Photoredox-Catalyzed Carbolactonization of Alkenoic Acids
use of a Ru photocatalyst and Umemoto’s reagent as a CF3 source is key in the present carbolactonization. This is the first example of a highly endo- and diastereoselectivesynthesis of CF3-substituted five-, six-, and seven-membered ring lactones from internal alkenoic acids.
A butenoic or propenoic acid derivative having the following formula in which G is an aryl or a heterocyclic ring, R11 and R12 are hydroben or an alkyl, X is sulfur or oxygen, R2 and R3 are hydrogen, an substituent such as an alkyl and J is pyridyl or phenyl having substituents and a heterocyclic ring may be formed between R2, R3 and J is provided here and is useful in the pharmacological field.