A Concise and Efficient Approach to 2,6-Disubstituted 4-Fluoropyrimidines from α-CF3 Aryl Ketones
作者:Fangran Liu、Xiaofei Zhang、Qun Qian、Chunhao Yang
DOI:10.1055/s-0039-1690248
日期:2020.1
Herein, a concise and efficient protocol to synthesize a series of 2,6-disubstituted 4-fluoropyrimidines as universal and useful building blocks in medicinal chemistry is reported. From readily accessible α-CF3 aryl ketones and different amidine hydrochlorides, this method provides a very practical approach to this kind of compounds under mild conditions with good to excellent yields.
Radical Desulfur‐Fragmentation and Reconstruction of Enol Triflates: Facile Access to α‐Trifluoromethyl Ketones
作者:Xiaolong Su、Honggui Huang、Yaofeng Yuan、Yi Li
DOI:10.1002/anie.201608507
日期:2017.1.24
efficient oxidative radical desulfur‐fragmentation and reconstruction of enoltriflates for the synthesis of α‐CF3 ketones. Preliminary mechanistic studies disclosed that oxidative fragmentation to release a CF3 radical from the triflyl group of enoltriflate and subsequent addition of the CF3 radical to another enoltriflate form the desired α‐CF3 ketones. This method provides a new approach to α‐CF3
Scissoring Enaminone C═C Double Bond by Free Radical Process for the Synthesis of α-Trifluoromethyl Ketones with CF<sub>3</sub>SO<sub>2</sub>Na
作者:Lu Gan、Qing Yu、Yunyun Liu、Jie-Ping Wan
DOI:10.1021/acs.joc.0c02431
日期:2021.1.1
The C═C double bond cleavage on tertiary enaminones, enabling the formation of a new C–CF3 bond, has been realized as a practical method for the synthesis of α-trifluoromethyl ketones with only the promotion of TBHP and ambient heating. Control experiments support that the reactions proceed via a featured freeradical process. The deuterium labeling experiment employing D2O indicates that water participated
Synthesis of α‐Trifluoromethylated Ketones from Vinyl Triflates in the Absence of External Trifluoromethyl Sources
作者:Takuji Kawamoto、Rio Sasaki、Akio Kamimura
DOI:10.1002/anie.201608591
日期:2017.1.24
A novel method for the conversion of vinyl triflates into α‐trifluoromethylated ketones in the absence of external trifluoromethyl sources is described. This process accomplishes an efficient migration of the trifluoromethyl group of the triflate to the α‐position in the ketone through a radical process. The reaction proceeds by the addition of a trifluoromethyl radical to the vinyl triflate and subsequent