Copper-catalyzed oxidative cleavage of Passerini and Ugi adducts in basic medium yielding α-ketoamides
作者:Anirban Ghoshal、Mayur D. Ambule、Revoju Sravanthi、Mohit Taneja、Ajay Kumar Srivastava
DOI:10.1039/c9nj03533h
日期:——
oxidative cleavage of Passerini and Ugi adducts in the presence of base and copper(I) iodide is studied in detail. The oxidative cleavage yields α-ketoamides along with acids and amides from Passerini and Ugi adducts respectively. Mechanistic investigations revealed that the reaction proceeds via a radical pathway involving molecular oxygen. Control experiments with 18O-labeled Passerini adducts confirmed
Published as part of the Special Topic Recent Advances in Amide Bond Formation Abstract A post-Passerini condensation transformation can be employed in the synthesis of three types of amides: α-hydroxy, α-oxy, and α-oxo amides. K2CO3 efficiently promotes the solvolysis of α-acetoxy amides to form α-hydroxy amides in methanol. 2-Acetoxy-2-(2-alkynylquinolin-3-yl)acetamides in basic methanol are cyclized
作为特别主题的一部分发表,酰胺键形成的最新进展 抽象 Passerini后缩合转化可用于合成三种类型的酰胺:α-羟基,α-氧基和α-氧代酰胺。K 2 CO 3有效地促进α-乙酰氧基酰胺的溶剂分解以在甲醇中形成α-羟基酰胺。碱性甲醇中的2-乙酰氧基-2-(2-炔基喹啉-3-基)乙酰胺通过脱乙酰基作用和5- exo - dig环化作用环化为1,3-二氢呋喃[3,4- b ]喹啉-1-羧酰胺。在碱性介质中用I 2处理2-羟基-2- [2-(苯基乙炔基)喹啉-3-基]乙酰胺产生吡咯并[2,3- b]喹啉-2,3-二酮。该环化涉及分子内环化,脱炔基芳构化和仲醇的氧化。