A New Life for an Old Reagent: Fluoroalkyl Amino Reagents as Efficient Tools for the Synthesis of Diversely Fluorinated Pyrazoles
作者:Sergiy Pazenok、Florence Giornal、Grégory Landelle、Norbert Lui、Jean-Pierre Vors、Frédéric R. Leroux
DOI:10.1002/ejoc.201300561
日期:2013.7
describe the first practical method for the regioselective preparation of 3,5-bis(fluoroalkyl)pyrazoles. Starting from commercially available fluoroacetoacetates and by using (tetrafluoroethyl)dimethylamine as a convenient CF2H transfer reagent, this straightforward one-pot sequence affords highly substituted pyrazoles in good yields and excellent regioselectivity. Furthermore, these carboxylate intermediates
在此,我们描述了区域选择性制备 3,5-双(氟烷基)吡唑的第一种实用方法。从市售的氟乙酰乙酸酯开始,并使用(四氟乙基)二甲胺作为方便的 CF2H 转移试剂,这种简单的一锅法以良好的收率和出色的区域选择性提供了高度取代的吡唑。此外,这些羧酸酯中间体被转化为相应的吡唑酸,这是设计新型生物活性成分的宝贵基础。