Cross Dehydrogenative Coupling via Base-Promoted Homolytic Aromatic Substitution (BHAS): Synthesis of Fluorenones and Xanthones
作者:Sebastian Wertz、Dirk Leifert、Armido Studer
DOI:10.1021/ol4000857
日期:2013.2.15
Cross dehydrogenative coupling reactions occurring via base-promoted homolytic aromatic substitutions (BHASs) are reported. Fluorenones and xanthones are readily prepared via CDC starting with readily available ortho-formyl biphenyls and ortho-formyl biphenylethers, respectively. The commercially available and cheap tBuOOH is used as an oxidant. Initiation of the radical chain reaction is best achieved
Synthesis of fluorenones viaquaternary ammonium salt-promoted intramolecular dehydrogenative arylation of aldehydes
作者:Zhuangzhi Shi、Frank Glorius
DOI:10.1039/c2sc21823b
日期:——
Biologically interesting fluorenone, xanthone and anthrone derivatives have been prepared via an intramolecular oxidative acylation process. This novel direct acylation reaction proceeded without the aid of any transition metals, acids or bases, and uses a catalytic amount of a quaternary ammonium salt in the presence of a persulfate oxidant. Initial mechanistic studies have been carried out to elucidate