A silver‐mediated oxidative difluoromethylation of styrenes and vinyl trifluoroborates with TMSCF2H is reported for the first time. This method enables direct and facile access to CF2H‐alkenes from abundant alkenes with excellent functional‐group compatibility. Moreover, this Ag/TMSCF2H protocol could further enable a series of radical difluoromethylation reactions of a wide array of substrates, offering
Divergent S- and C-Difluoromethylation of 2-Substituted Benzothiazoles
作者:Xiu Wang、Wenchao Ye、Taige Kong、Chenlu Wang、Chuanfa Ni、Jinbo Hu
DOI:10.1021/acs.orglett.1c03267
日期:2021.11.5
Two unprecedented and complementary synthetic strategies for S- and C-difluoromethylation of 2-substituted benzothiazoles have been developed by taking advantage of the remarkably different reactivity of CF2H– and 2-PySO2CF2– nucleophiles. A variety of structurally diverse difluoromethyl 2-isocyanophenyl sulfides and 2-difluoromethylated benzothiazoles were synthesized with these two new synthetic
Copper-Promoted Cycloaddition of α-Methylenyl Isocyanides with Benzothiazoles: Tunable Access to Benzo[<i>d</i>]imidazothiazoles
作者:Jian Wang、Jing Li、Qiang Zhu
DOI:10.1021/acs.orglett.5b02694
日期:2015.11.6
benzothiazoles. When the C2 position of benzothiazole is linked to a C–H or C–C bond, benzo[d]imidazo[2,1-b]thiazoles are obtained through a novel rearrangement via C–S bond cleavage and formation of a new C–S bond. When 2-chloro- or 2-bromobenzothiazoles are used under the same reaction conditions, the isomeric benzo[d]imidazo[5,1-b]thiazoles are formed selectively. These reactions proceed smoothly in moderate
通过α-亚甲基异氰化物与苯并噻唑的铜促进的环加成反应,已开发出可调谐途径生成苯并[ d ]咪唑并噻唑的两种异构体。当苯并噻唑的C2位置与C–H或C–C键相连时,通过C–S键的裂解和新C的形成,通过新颖的重排可以获得苯并[ d ]咪唑基[2,1- b ]噻唑–S键。当在相同反应条件下使用2-氯-或2-溴苯并噻唑时,选择性地形成异构体苯并[ d ]咪唑并[5,1- b ]噻唑。这些反应在室温下以中等至极好的收率顺利进行,并且可以容忍各种官能团。
Metallaphotoredox Difluoromethylation of Aryl Bromides
作者:Vlad Bacauanu、Sébastien Cardinal、Motoshi Yamauchi、Masaru Kondo、David F. Fernández、Richard Remy、David W. C. MacMillan
DOI:10.1002/anie.201807629
日期:2018.9.17
strategy for the difluoromethylation of arylbromides by metallaphotoredox catalysis. Bromodifluoromethane, a simple and commercially available alkyl halide, is harnessed as an effective source of difluoromethyl radical by silyl‐radical‐mediated halogen abstraction. The merger of this fluoroalkyl electrophile activation pathway with a dual nickel/photoredox catalytic platform enables the difluoromethylation
[EN] PROCESS FOR PRODUCTION OF DFMB DERIVATIVES<br/>[FR] PROCÉDÉ DE PRÉPARATION DE DÉRIVÉS DE DFMB
申请人:RHODIA OPERATIONS
公开号:WO2013123634A1
公开(公告)日:2013-08-29
Disclosed is a process for the production of a compound of formula (ΙΠ). The process comprises a step of reacting a compound of formula (I) with an excess amount of a compound of formula (II) in absence of aromatic solvent:wherein - n is 0 1, 2, 3 or 4; - X is NH, O or S; - each R] group may be the same or different, and is independently selected from the group consisting of hydrogen, hydroxyl, alkoxy, alkyl, carbonyl, carboxyl, carboxylic acid ester groups, amido, cyano, halogenated aliphatic, nitro, or amino groups; - R2 group is selected from the group consisting of hydroxyl, CI, F, Br, amino or alkoxy.