Simple Phase Transfer Catalytic Method for α-Methoxylation of Sterically Hindered Ketones
摘要:
Reactions of sterically hindered ketones of ArylCOCHR(1)R(2) type (R(1), R(2) Me, Et, Ph) with carbon tetrachloride and methyl iodide in the presence of solid KOH and 18-crown-6 afford the corresponding alpha-methoxyketones [ArylCOC(OMe)R(1)R(2)] in one-pot process in 30-67% yields.
Selective C–C bond establishment from plentiful carbonyl compounds, which represents a crucial route to get the value-added products, is still far from satisfying both academic and industrial needs. Here, confirmed by both experiment and theoretical calculation, we report versatile and efficient asymmetric cross-coupling between carbonyl radicals (from aldehydes) and aryl radicals (from aryl halides)
Quadruple N-heterocyclic carbene/cobalt/photoredox/Brønsted base catalysis is demonstrated, realizing branch-selective hydroacylation of styrenes with aromatic and aliphatic aldehydes. This protocol allows to access branched ketones from readily available materials in an atom-economical manner. The quadruple catalysis can transfer a formyl hydrogen of aldehydes as hydrogen radical equivalent onto terminal
Ketal derivatives and the use thereof as intermediate products
申请人:SAGAMI CHEMICAL RESEARCH CENTER
公开号:EP0014440A1
公开(公告)日:1980-08-20
Ketal derivative having the formula:
in which R1 and R2 individually represent alkyl groups, or R' and R2 may together form an alkylene group, and X is a hydrogen atom, a halogen atom ora cyano group, and the use thereof as intermediate products for producing Suprofen.
Branch-Selective Intermolecular Hydroacylation: Hydrogen-Mediated Coupling of Anhydrides to Styrenes and Activated Olefins
作者:Young-Taek Hong、Andriy Barchuk、Michael J. Krische
DOI:10.1002/anie.200602377
日期:2006.10.20
Iron-Catalyzed Acylation of Polyfunctionalized Aryl- and Benzylzinc Halides with Acid Chlorides
作者:Andreas D. Benischke、Marcel Leroux、Irina Knoll、Paul Knochel
DOI:10.1021/acs.orglett.6b01677
日期:2016.8.5
FeCl2 (5 mol %) catalyzes a smooth and convenient acylation of functionalized arylzinc halides at 50 °C (2–4 h) and benzylic zinc chlorides at 25 °C (0.5–4 h) with a variety of acidchlorides leading to polyfunctionalized diaryl and aryl heteroaryl ketones.