Construction of Vicinal Quaternary Carbons via Cu-catalyzed Dearomative Radical Addition
作者:Naoki Tsuchiya、Takashi Nishikata
DOI:10.1246/cl.190247
日期:2019.7.5
In this paper, we confirmed the dearomative addition of tertiary alkyl radicals onto BHT derivatives to form highly congested vicinal quaternary carbons to produce tert-alkylated styrenes in the pr...
Facile Synthesis of Single α-<i>tert</i>
-Alkylated Acetaldehydes by Hydroxyalkylation of Enamides in Aqueous Solution
作者:Yumi Murata、Takashi Nishikata
DOI:10.1002/chem.201801065
日期:2018.4.25
Cu‐catalyzed hydroxyalkylation of enamides in aqueous solutions. The yields of the products were very high and there was excellent functional group compatibility. Our reaction allows easy access to highly functionalized acetaldehydes that can be used to synthesize further useful compounds including spirocycles. The control experiments revealed that this reaction includes hydroxyalkylation processes via
Radical and Cation Crossover Reaction System Enables Synthesis of Complex Aliphatic Chains Possessing Functionalized Quaternary Carbons
作者:Yumi Murata、Taisei Shimada、Takashi Nishikata
DOI:10.1246/bcsj.20190120
日期:2019.9.15
Controlling the reactive species during the synthesis of complex aliphatic chains containing a quaternary carbon is incredibly difficult. In this paper, we efficiently controlled both radical and c...
Herein, we report an efficient method for the tertiary alkylation of a ketone by using an α‐bromocarbonyl compound as the tertiary alkyl source in a combined Cu‐organocatalyst system. This dual catalyst system enables the addition of a tertiary alkyl radical to an enamine. Mechanistic studies revealed that the catalytically generated enamine is a key intermediate in the catalytic cycle. The developed
the most useful reactants for the synthesis of alkyne and alkene derivatives. Because an alkyne undergoes addition reaction at a C–C triple bond or cross-coupling at a terminal C–H bond. Combining those reaction patterns could realize a new reaction methodology to synthesize complex molecules including C–C multiple bonds. In this report, we found that the reaction of 3 equivalents of terminal alkyne