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
A problem of the present invention is to provide an economical process with minimized toxicity for producing an aromatic compound having a variety of substituents such as various alkyl groups, and the problem is solved by a process for production of an aromatic compound represented by formula (1) below, which comprises reacting a compound represented by formula (2) below with an aromatic magnesium reagent represented by formula (3a) below in the presence of an iron catalyst and a diamine compound:
wherein R is an optionally substituted hydrocarbon group or a C
3
-C
10
saturated or unsaturated ring group; A is an optionally substituted C
4
-C
20
aromatic group or an optionally substituted heteroaromatic group; X is a halogen atom or a sulfonic acid ester; and Y
1
is bromine, iodine, chlorine or a carbanion ligand.
HALOGENATING AGENT AND PROCESS FOR HALOGENATING HYDROXYL GROUP
申请人:OTSUKA KAGAKU KABUSHIKI KAISHA
公开号:EP0976700A1
公开(公告)日:2000-02-02
A halogenating agent of the formula (1) and a method of halogenating hydroxyl group
wherein R1 and R2 are the same or different and are each ethyl, propyl, isopropyl, butyl, isobutyl or allyl; X is chlorine atom or bromine atom; and Y is chlorine ion, bromine ion, dichlorophosphate ion, dibromophosphate ion, chlorosulfonate ion, bromosulfonate ion, chlorooxalate ion or bromooxalate ion.
A problem of the present invention is to provide an economical process with minimized toxicity for producing an aromatic compound having a variety of substituents such as various alkyl groups, and the problem is solved by a process for production of an aromatic compound represented by formula (1) below, which comprises reacting a compound represented by formula (2) below with an aromatic magnesium reagent represented by formula (3a) below in the presence of an iron catalyst and a diamine compound:
wherein R is an optionally substituted hydrocarbon group or a C3 - C10 saturated or unsaturated ring group; A is an optionally substituted C4 - C20 aromatic group or an optionally substituted heteroaromatic group; X is a halogen atom or a sulfonic acid ester; and Y1 is bromine, iodine, chlorine or a carbanion ligand.