Copper-Mediated Fluorination of Arylboronate Esters. Identification of a Copper(III) Fluoride Complex
摘要:
A method for the direct conversion of arylboronate esters to aryl fluorides under mild conditions with readily available reagents is reported. Tandem reactions have also been developed for the fluorination of arenes and aryl bromides through arylboronate ester intermediates. Mechanistic studies suggest that this fluorination reaction occurs through facile oxidation of Cu(I) to Cu(III), followed by rate-limiting transmetalation of a bound arylboronate to Cu(III). Fast C-F reductive elimination is proposed to occur from an aryl- copper(III)-fluoride complex. Cu(III) intermediates have been generated independently and identified by NMR spectroscopy and ESI-MS.
作者:Thomas M. Gøgsig、Dennis U. Nielsen、Anders T. Lindhardt、Troels Skrydstrup
DOI:10.1021/ol300837d
日期:2012.5.18
The direct carbonylativepalladiumcatalyzedsynthesis of monoprotected 1,3-ketoaldehydes is reported starting from aryl iodides applying near stoichiometric amounts of carbonmonoxide. Besides representing platforms for a variety of heterocyclic structures, these motives serve as viable precursors for the highly relevant aryl methyl ketones. The presented strategy can also be adapted for the facile
Effective Palladium-Catalyzed Hydroxycarbonylation of Aryl Halides with Substoichiometric Carbon Monoxide
作者:Signe Korsager、Rolf H. Taaning、Troels Skrydstrup
DOI:10.1021/ja3114032
日期:2013.2.27
A protocol for the Pd-catalyzed hydroxycarbonylation of aryl iodides, bromides, and chlorides has been developed using only 1-5 mol % of CO, corresponding to a p(CO) as low as 0.1 bar. Potassium formate is the only stoichiometric reagent, acting as a mildly basic nucleophile and a reservoir of CO. The substoichiometric CO could be delivered to the reaction from an acyl-Pd(II) precatalyst, which provides
已开发出一种用于芳基碘化物、溴化物和氯化物的 Pd 催化羟基羰基化的方案,仅使用 1-5 mol% 的 CO,对应于低至 0.1 bar 的 ap(CO)。甲酸钾是唯一的化学计量试剂,作为温和的碱性亲核试剂和 CO 的储库。亚化学计量的 CO 可以从酰基-Pd(II) 预催化剂输送到反应中,提供 CO 和活性催化剂,和从而避免了处理有毒气体的需要。
radicals, generated in situ. A simple metal-free borylation of aryl iodides mediated by a fluoride sp2–sp3 diboron adduct is described. The reaction conditions are compatible with various functional groups. Electroniceffects of substituents do not affect the borylation while steric hindrance does. The reaction proceeds via a radical mechanism in which pyridine serves to stabilize the boryl radicals, generated
[EN] TRIAZOLES FOR THE TREATMENT OF DEMYELINATING DISEASES<br/>[FR] TRIAZOLES POUR LE TRAITEMENT DE MALADIES LIÉES À LA DÉMYÉLINISATION
申请人:VERTEX PHARMA
公开号:WO2016197009A1
公开(公告)日:2016-12-08
The invention relates to triazole compounds of formula I and I' or pharmaceutically acceptable salts thereof, useful as modulators of demyelinating diseases: The invention also provides pharmaceutically acceptable compositions comprising the compounds of the invention, methods of using the compositions and kits thereof in the treatment of various demyelinating and neurodegenerative diseases, including multiple sclerosis.
[EN] FLUORINATION OF ARYL COMPOUNDS<br/>[FR] FLUORATION DE COMPOSÉS ARYLES
申请人:UNIV CALIFORNIA
公开号:WO2014107379A1
公开(公告)日:2014-07-10
The invention provides compositions and methods of using the compositions in fluorinating aryl precursors containing a leaving group replaceable by a fluorine atom. The compositions include a metal ion source, a electrophilic fluorine source, a base, and a compound, which is an aryl precursor of the aryl fluoride, and which has a leaving group replaceable by the fluorine atom. Exemplary methods of the invention make use of such compositions and methods to prepare an aryl fluoride compound. In an exemplary embodiment, the electrophilic fluorine source is a source of 18F.