Oxydifluoromethylation of Alkenes by Photoredox Catalysis: Simple Synthesis of CF<sub>2</sub>
H-Containing Alcohols
作者:Yusuke Arai、Ren Tomita、Gaku Ando、Takashi Koike、Munetaka Akita
DOI:10.1002/chem.201504838
日期:2016.1.22
developed a novel and simple protocol for the direct incorporation of a difluoromethyl (CF2 H) group into alkenes by visible-light-driven photoredox catalysis. The use of fac-[Ir(ppy)3] (ppy=2-pyridylphenyl) photocatalyst and shelf-stable Hu's reagent, N-tosyl-S-difluoromethyl-S-phenylsulfoximine, as a CF2 H source is the key to success. The well-designed photoredox system achieves synthesis of not only β-CF2
我们已经开发出一种新颖且简单的协议,可通过可见光驱动的光氧化还原催化将二氟甲基(CF2 H)基团直接掺入烯烃。使用fac- [Ir(ppy)3](ppy = 2-吡啶基苯基)光催化剂和耐贮存的Hu's试剂N-甲苯磺酰基-S-二氟甲基-S-苯基亚砜基亚胺作为CF2 H来源是成功的关键。精心设计的光氧化还原系统不仅可以通过溶剂分解法从烯烃中合成β-CF2H-取代的醇,而且还可以合成醚和酯。本方法允许从烯烃中C = C部分的C(sp(3))-CF 2 H和C(sp(3))-O键的一步和区域选择性形成,例如羟基二氟甲基化,无论末端或内部烯烃。此外,这种方法可以容忍各种功能基团。