Hydrochlorofluoromethylation of unactivated alkenes with chlorofluoroacetic acid
作者:Claudio F. Meyer、Sandrine M. Hell、Jeroen B.I. Sap、Antonio Misale、Aldo Peschiulli、Daniel Oehlrich、Andrés A. Trabanco、Véronique Gouverneur
DOI:10.1016/j.tet.2019.130679
日期:2019.11
An operationally simple method enabling hydrochlorofluoromethylation of unactivated alkenes under visible light activation is reported. The procedure has various benefits. It uses commercially available and inexpensive chlorofluoroacetic acid and phenyliodine(III) diacetate for the generation of the required chlorofluoromethyl radical, it converts feedstock olefins into attractive 1-chloro-1-fluoroalkanes
Hydrodifluoromethylation of Alkenes with Difluoroacetic Acid
作者:Claudio F. Meyer、Sandrine M. Hell、Antonio Misale、Andrés A. Trabanco、Véronique Gouverneur
DOI:10.1002/anie.201903801
日期:2019.6.24
hydrodifluoromethylation of alkenes is reported using difluoroacetic acid and phenyliodine(III) diacetate in tetrahydrofuran undervisible‐light activation. This metal‐free approach stands out as it uses inexpensive reagents, does not require a photocatalyst, and displays broad functional group tolerance. The procedure is also operationally simple and scalable, and provides access in one step to high‐value
A time-economical and robust synthesis of various selenofunctionalized heterocycles was accomplished via I2O5-mediated selenocyclizations of olefins with diselenides. Using this method, 116 selenomethyl-substituted heterocycles were synthesized with up to 97% isolated yield in minutes. Additional features of this new protocol include the use of an inorganic oxidant, mild conditions, and easy operation
通过I 2 O 5介导的烯烃与二硒化物的硒环化,实现了各种硒官能化杂环的经济且稳健的合成。使用这种方法,在几分钟内合成了 116 个硒甲基取代的杂环,分离产率高达 97%。这个新协议的其他特点包括使用无机氧化剂、温和的条件和易于操作。初步研究表明,这种转化是通过硒基碘诱导的亲电环化进行的。
CuBr 2 -promoted intramolecular bromocyclization of N-allylamides and aryl allyl ketone oximes
作者:Chun-Hua Yang、Zhong-Qi Xu、Lili Duan、Yue-Ming Li
DOI:10.1016/j.tet.2017.10.025
日期:2017.11
A new and easy-to-perform route to 2-oxazolines amd isoxazolines was reported. Using CuBr2 as both the bromide source and the reaction promoter, bromocyclization of N-allylamides and allyl ketone oximes proceeded readily, leading to oxazolines and isoxazolines in good to excellent yields.
haloheterocyclization of N-alkenylamides using bulk and common chemicals such as 1,2-dihaloethanes as halogenating reagents are less studied. Herein, we have developed an electrochemical intramolecular haloheterocyclization of N-alkenylamides to prepare 2-oxazolines, 2-thiazolines, 1,3-oxazines and isoxazolines using readily available 1,2-dihaloethanes as halogenating reagents. This protocol is a convergent