A Simple and Green Tandem Knoevenagel–Phospha-Michael Reaction for One-Pot Synthesis of 2-Oxindol-3-ylphosphonates Catalyzed by a DABCO-Based Ionic Liquid
作者:Ya-Qin Yu、Da-Zhen Xu、Lan-Lan Song、Cheng Yang
DOI:10.1055/s-0036-1588357
日期:——
approach is readily amenable to large-scale synthesis. A simple, clean, and efficient approach for the one-pot synthesis of 2-oxindol-3-ylphosphonates has been successfully developed. With 7 mol% loading of the 1,4-diazabicyclo[2.2.2]octane-based ionic liquid catalyst, 2-oxindol-3-ylphosphonates form in good to excellent yields within short times. This tandem reaction involves a phospha-Michael addition
摘要 已经成功开发了一种简单,清洁,有效的一锅合成2-oxindol-3-ylphosphonates的方法。负载1,4-二氮杂双环[2.2.2]辛烷的离子液体催化剂的量为7 mol%,可以在短时间内以优异的产率形成2-氧吲哚-3-基膦酸酯。该串联反应涉及将磷酸-迈克尔加成到活化的烯烃上,所述烯烃通过Knoevenagel缩合原位形成。相应的产物易于通过简单的结晶分离和纯化。催化剂可以循环使用五次而不会显着降低活性。这种方法易于进行大规模合成。 已经成功开发了一种简单,清洁,有效的一锅合成2-oxindol-3-ylphosphonates的方法。负载1,4-二氮杂双环[2.2.2]辛烷的离子液体催化剂的量为7 mol%,可以在短时间内以优异的产率形成2-氧吲哚-3-基膦酸酯。该串联反应涉及将磷酸-迈克尔加成到活化的烯烃上,所述烯烃通过Knoevenagel缩合原位形成。相应的产物易于通过