Gold-Catalyzed Oxidation Terminal Alkyne: An Approach to Synthesize Substituted Dihydronaphthalen-2(1<i>H</i>)-ones and Phenanthrenols
作者:Hui-Bo Ling、Zi-Sheng Chen、Fang Yang、Bin Xu、Jin-Ming Gao、Kegong Ji
DOI:10.1021/acs.joc.7b01244
日期:2017.7.7
A facile gold-catalyzed oxidationterminalalkynes to synthesize substituted dihydronaphthalen-2(1H)-ones 3 and phenanthrenols 5 was realized. Various useful structures and drug precursors were generated in up to 99% yield under mild condition and lowcatalystloading.
α-Carbonyl Radicals from <i>N</i>-Enoxybenzotriazoles: De Novo Synthesis of 9-Phenanthrols
作者:Quynh H. Nguyen、Tae-Woong Um、Seunghoon Shin
DOI:10.1021/acs.orglett.2c03356
日期:2022.11.18
donors or alcoholic solvents led to α-carbonylradicals. The utility of the α-carbonylradicals was demonstrated in intramolecular tandemcyclization and in the synthesis of 9-phenanthrols and their analogues. The mechanistic experiments suggested that quenching of the reactive benzotriazolyl radical by the alcohol was accompanied by the formation of an α-hydroxy radical that mediated hydrogen atom transfer
Directed Metalation–Suzuki–Miyaura Cross-Coupling Strategies: Regioselective Synthesis of Hydroxylated 1-Methyl-phenanthrenes
作者:Kåre B. Jørgensen、Toni Rantanen、Thilo Dörfler、Victor Snieckus
DOI:10.1021/acs.joc.5b01300
日期:2015.10.2
A general, efficient, and regioselective synthesis of a series of hydroxylated 1-methylphenanthrenes 9 by a combined directed ortho metalation (DoM)-Suzuki-Miyaura cross-coupling directed remote metalation (DreM) sequence is reported. Diversity to this methodology was achieved by a regioselective DoM rather than DreM reaction, affording more highly substituted phenanthrols (Table 2). Application of the turbo-Grignard reagent (i-PrMgCl-LiCl) in the Ni-catalyzed Corriu-Kumada reaction gave efficient decarbamoylation (Tables 3 and 4). Additional features are the TMS protecting group and halo-induced ipso-desilylation tactics applied to the regioselective synthesis of phenanthrenes (Scheme 2).
Jacques; Kagan, Bulletin de la Societe Chimique de France, 1956, p. 128,136