Reductive Chlorination and Bromination of Ketones via Trityl Hydrazones
作者:Julius R. Reyes、Viresh H. Rawal
DOI:10.1002/anie.201510909
日期:2016.2.24
A method is presented for the direct transformation of a ketone to the corresponding reduced alkyl chloride or bromide. The process involves the reaction of a ketone trityl hydrazone with tBuOCl to give a diazene which readily collapses to the α‐chlorocarbinyl radical, reduction of which by a hydrogen atom source gives the alkyl chloride product. The use of N‐bromosuccinimide provides the corresponding
An iron-catalyzed cross-coupling reaction of a primary or secondary alkyl halide with an aryl Grignardreagent proceeds under mild conditions to give the corresponding coupling product in quantitative yield.
Regiodivergent C−H and Decarboxylative C−C Alkylation by Ruthenium Catalysis:
<i>ortho</i>
versus
<i>meta</i>
Position‐Selectivity
作者:Korkit Korvorapun、Marc Moselage、Julia Struwe、Torben Rogge、Antonis M. Messinis、Lutz Ackermann
DOI:10.1002/anie.202007144
日期:2020.10.12
Ruthenium(II)biscarboxylate complexes enabled the selectivealkylation of C−H and C−C bonds at the ortho‐ or meta‐position. ortho‐C−HAlkylations were achieved with 4‐, 5‐ as well as 6‐membered halocycloalkanes. Furthermore, the judicious choice of the directing group allowed for a full control of ortho‐/meta‐selectivities. Detailed mechanistic studies by experiment and computation were performed and
Catalytic Access to Alkyl Bromides, Chlorides and Iodides via Visible Light-Promoted Decarboxylative Halogenation
作者:Lisa Candish、Eric A. Standley、Adrián Gómez-Suárez、Satobhisha Mukherjee、Frank Glorius
DOI:10.1002/chem.201602251
日期:2016.7.11
Herein is reported the catalytic, visiblelight‐promoted, decarboxylative halogenation (bromination, chlorination, and iodination) of aliphatic carboxylicacids. This operationally‐simple reaction tolerates a range of functional groups, proceeds at room temperature, and is redox neutral. By employing an iridium photocatalyst in concert with a halogen atom source, the use of stoichiometric metals such
New stereoselective routes from alcohols to secondary alkyl bromides with retention of configuration
作者:Mireille Sevrin、Alain Krief
DOI:10.1039/c39800000656
日期:——
Secondaryalcohols can be converted into the corresponding bromides with high stereoselectiveretention of configuration; this two-step process proceeds by a double inversion involving the intermediate selenides.