一种新型的双效离子液体,可作为合成3-甲基-4-芳基亚甲基-异恶唑-5(4 H )-ones的高效双功能催化剂
摘要:
摘要 制备了一种新型的两性离子液体 N , N , N ', N'- 四甲基 -N , N'- 双(磺基)乙烷-1,2-甲磺酸二铵[TMBSED] [OMs] 2),并通过分析其1 H NMR,13 C NMR,FT-IR,质量和热重数据确定。此后,它已被用作高效,均质和双功能的催化剂,以促进乙酰乙酸乙酯,羟胺盐酸盐和芳醛在无溶剂条件下的多组分反应,从而合成3-甲基-4-芳基亚甲基-异恶唑-5(4 小时 )-那些。由于[TMBSED] [OMs] 2的双重功能(具有酸性和碱性位点),并且每个都具有两个位点,因此它是一种高效且通用的合成催化剂。此外,已经提出了基于催化剂的双重功能的合理且有吸引力的机理。 图形概要
A bifunctional squaramide-catalysed enantioselective vinylogous Michael addition/cyclization cascade reaction of 4-unsaturated isoxazol-5-ones and α,α-dicyanoalkenes
作者:Yu Wang、Cheng Niu、Dong-Hua Xie、Da-Ming Du
DOI:10.1039/d1ob01256h
日期:——
stereoselective synthesis of spiro isoxazolone-cyclohexenimines was developed using a bifunctional squaramide-catalysed vinylogous Michael addition/cyclization cascade reaction of 4-unsaturated isoxazol-5-ones and α,α-dicyanoalkenes. The atom-economical cascade process can proceed smoothly under extremely low catalyst loading (1 mol%) and mild conditions, and the corresponding products were obtained
arylaldehydes under solvent-free conditions for the synthesis of 3-methyl-4-arylmethylene-isoxazole-5(4 H )-ones. Due to the dual-functionality of [TMBSED][OMs]2 (possessing acidic and basic sites), and also having two sites of each, it was a highly effective and general catalyst for the synthesis. Moreover, a plausible and attractive mechanism based on the dual-functionality of the catalyst has been proposed
摘要 制备了一种新型的两性离子液体 N , N , N ', N'- 四甲基 -N , N'- 双(磺基)乙烷-1,2-甲磺酸二铵[TMBSED] [OMs] 2),并通过分析其1 H NMR,13 C NMR,FT-IR,质量和热重数据确定。此后,它已被用作高效,均质和双功能的催化剂,以促进乙酰乙酸乙酯,羟胺盐酸盐和芳醛在无溶剂条件下的多组分反应,从而合成3-甲基-4-芳基亚甲基-异恶唑-5(4 小时 )-那些。由于[TMBSED] [OMs] 2的双重功能(具有酸性和碱性位点),并且每个都具有两个位点,因此它是一种高效且通用的合成催化剂。此外,已经提出了基于催化剂的双重功能的合理且有吸引力的机理。 图形概要