Graphene Oxide: A Metal‐Free Carbocatalyst for the Synthesis of Diverse Amides under Solvent‐Free Conditions
作者:Khushbu P. Patel、Eknath M. Gayakwad、Vilas V. Patil、Ganapati S. Shankarling
DOI:10.1002/adsc.201801673
日期:2019.4.23
solvent‐free reaction conditions providing desired products in good to excellent yields. The one‐pot synthesis of 2,3‐Dihydro‐5H‐benzo[b]‐1,4‐thiazepin‐4‐one moiety by GO catalyzed Aza Michael addition followed by intramolecular transamidation is also described. A plausible reaction mechanistic pathway involving H‐bonding is discussed. The graphene oxide can be recycled and reused up to five cycles without
证明了环保,廉价,碳催化剂,氧化石墨烯(GO)促进了各种羧酰胺与脂肪族,环状和芳香族胺的高效无金属氨基转移。该协议同样适用于邻苯二甲酰亚胺,尿素和硫代酰胺,以确定其适应性。存在于氧化石墨烯表面的羰基(-C = O),环氧(-O-),羧基(-COOH)和羟基(-OH)等氧化官能团赋予催化剂酸性。氧化石墨烯本质上是多相的,可以在无溶剂的反应条件下有效地工作,从而以高至优异的收率提供所需的产物。还描述了GO催化的Aza Michael加成反应,然后进行分子内氨基转移,一锅法合成2,3-二氢-5H-苯并[b] -1,4-噻吩并-4-酮部分。讨论了涉及氢键的可能的反应机理途径。氧化石墨烯可以循环使用多达五个周期,而催化活性却没有太大损失。