Iridium-catalyzed selective α-methylation of ketones with methanol
作者:Shinji Ogawa、Yasushi Obora
DOI:10.1039/c3cc49626k
日期:——
Iridium-catalyzed selective α-dimethylation and α-methylation of ketones or phenylacetonitriles, using methanol as the methylating agent, were achieved.
Utilization of MeOH as a C1 Building Block in Tandem Three-Component Coupling Reaction
作者:Kaushik Chakrabarti、Milan Maji、Dibyajyoti Panja、Bhaskar Paul、Sujan Shee、Gourab Kanti Das、Sabuj Kundu
DOI:10.1021/acs.orglett.7b02105
日期:2017.9.15
Ru(II) catalyzed tandemsynthesis of α-branched methylated ketones via multicomponent reactions following the hydrogen borrowing process is described. This nonphosphine-based air and moisture stable catalyst efficiently produced various methylated ketones using methanol as a methylating agent. This system was found to be highly effective in three-componentcoupling between methanol, primary alcohols
Silver/NBS-Catalyzed Synthesis of α-Alkylated Aryl Ketones from Internal Alkynes and Benzyl Alcohols via Ether Intermediates
作者:Supill Chun、Young Keun Chung
DOI:10.1021/acs.orglett.8b02252
日期:2018.9.21
inimide (NBS)-catalyzed synthesis of α-alkylated aryl ketones with a tertiary carbon center from internal alkynes and benzyl alcohols is reported. This reaction proceeds via the etherification of benzyl alcohols with an in situ generated benzyl bromide, formed by the reaction of benzyl alcohol with a catalytic amount of NBS and AgSbF6. Ag-catalyzed C–O cleavage of the ether leads to a tolyl radical
An electron rich, new co-operative iridium(III) complex catalysed tandem conversion of α,β-unsaturated ketones to the α-methylated ketones is described using methanol. Employing this chemoselective protocol, reductive methylation of a wide range of chalcone derivatives, variety of aryl and aliphatic fragment containing α,β-unsaturated ketones along with few biologically important molecules were effectively
Ruthenium(II)-Catalyzed Hydrogenation and Tandem (De)Hydrogenation <i>via</i> Metal–Ligand Cooperation: Base- and Solvent-Assisted Switchable Selectivity
作者:Rahul Daga Patil、Sanjay Pratihar
DOI:10.1021/acs.joc.2c01965
日期:——
carbonate)-assisted switchable synthesis of saturated ketone and α-methyl saturated ketone from α,β-unsaturated ketone is developed. Mechanistic aspects, evaluated from spectroscopic studies, in situ monitoring of the reaction progress, control studies, and labeling studies, further indicate the involvement of a tandem dehydrogenation–condensation–hydrogenation sequence in the reaction, in which the interconvertible