Huan, Leitao; Shu, Xiaomin; Zu, Weisai; Zhong, De; Huo, Haohua published the artcile< Asymmetric benzylic C(sp3)-H acylation via dual nickel and photoredox catalysis>, Electric Literature of 2725-82-8, the main research area is alpha aryl ketone enantioselective preparation photochem; alkylarene carboxylic acid benzylic carbon hydrogen acylation nickel photocatalyst; photochem alpha aryl ester enantioselective preparation; phenyl chloroformate alkylarene coupling nickel photocatalyst.
An asym. benzylic C-H acylation of alkylarenes employing carboxylic acids as acyl surrogates for synthesis of α-aryl ketones I [R1 = Me, 2-thienyl, 2-naphthyl, etc.; R2 = Me, Et, CH2CH2OAc, etc.; Ar = 3-thienyl, 4-FC6H4, 1,1′-biphenyl, etc.] via nickel and photoredox dual catalysis was reported. This mild yet straightforward protocol transformed a diverse array of feedstock carboxylic acids and simple alkyl benzenes into highly valuable α-aryl ketones with high enantioselectivities. The utility of this method was showcased in gram-scale synthesis and late-stage modification of medicinally relevant mols. Mechanistic studies suggested a photocatalytically generated bromine radical could perform benzylic C-H cleavage to activate alkylarenes as nucleophilic coupling partners which could then engage in a nickel-catalyzed asym. acyl cross-coupling reaction. This bromine-radical-mediated C-H activation strategy could be also applied to enantioselective coupling of alkylarenes with chloroformate for synthesis of chiral α-aryl esters, e.g., II.
Nature Communications published new progress about Acylation catalysts (stereoselective). 2725-82-8 belongs to class bromides-buliding-blocks, and the molecular formula is C8H9Br, Electric Literature of 2725-82-8.
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary