Synthesis of β-Trifluoromethylated Ketones from Propargylic Alcohols by Visible Light Photoredox Catalysis
作者:Sehyun Park、Jung Min Joo、Eun Jin Cho
DOI:10.1002/ejoc.201500031
日期:2015.7
A practical method to access β-trifluoromethyl ketonesfrom readily available propargylicalcohols by visiblelight photocatalysis has been developed. Trifluoromethylation of propargylicalcohols with CF3I in the presence of Ru(bpy)3Cl2 as the photocatalyst followed by double-bond migration/keto-enol tautomerization provides β-trifluoromethyl ketones as the final product.
Catalytic hydrotrifluoromethylation of styrenes and unactivated aliphatic alkenes via an organic photoredox system
作者:Dale J. Wilger、Nathan J. Gesmundo、David A. Nicewicz
DOI:10.1039/c3sc51209f
日期:——
method for the metal-free hydrotrifluoromethylation of alkenes. The method relies on the single electron oxidation of a commercially available sodiumtrifluoromethanesulfinate salt (CF3SO2Na, Langlois reagent) by N-Me-9-mesityl acridinium as a photoredox catalyst. Methyl thiosalicylate is used as a substoichiometric H-atom donor for aliphatic alkenes, and thiophenol is used as a stoichiometric H-atom donor
本文提出了一种用于烯烃的无金属加氢三氟甲基化的直接方法。该方法依赖于作为光氧化还原催化剂的N -Me-9-间苯二甲啶ium对市售三氟甲烷亚磺酸钠盐(CF 3 SO 2 Na,Langlois试剂)的单电子氧化。硫代水杨酸甲酯 用作脂肪族烯烃的亚化学计量的H原子供体,并且 苯硫酚用作苯乙烯基底物的化学计量的H原子供体。转化的底物范围很广,包括单,二和三取代的脂族和苯乙烯基烯烃,几乎在所有检查的情况下都具有很高的区域选择性。
Rhodium-Catalyzed Novel Trifluoromethylation at the α-Position of α,β-Unsaturated Ketones
Treatment of alpha,beta-unsaturated ketones with CF(3)I in the presence of Et(2)Zn and RhCl(PPh(3))(3) gave novel alpha-trifluoromethylation products in good yields. Hydrogen transfer from the ethyl group on the rhodium complex to the beta-position of the enone seems to play an important role in this reaction.