Visible-Light Photocatalytic Aerobic Annulation for the Green Synthesis of Pyrazoles
作者:Ya Ding、Te Zhang、Qiu-Yun Chen、Chunyin Zhu
DOI:10.1021/acs.orglett.6b01867
日期:2016.9.2
A selective and high yielding synthesis of polysubstituted pyrazoles through a VLPC (visible light photoredox catalysis)-promoted reaction of hydrazine with Michael acceptors is reported. The method employs very mild reaction conditions and uses air as the terminal oxidant, which makes the process environmentally benign. Different types of Michael acceptors with various substituents can undergo the
报道了通过VLPC(可见光氧化还原催化)促进的肼与迈克尔受体的反应选择性和高产率地合成多取代的吡唑。该方法采用非常温和的反应条件,并使用空气作为末端氧化剂,这使该过程对环境无害。具有各种取代基的不同类型的迈克尔受体可以进行反应,以良好至优异的产率得到相应的吡唑。提出该反应是通过VLPC促进的肼氧化成重氮,然后将其加到迈克尔受体上,而不是肼与羰基的常规缩合反应。