Bromide-Mediated C–H Bond Functionalization: Intermolecular Annulation of Phenylethanone Derivatives with Alkynes for the Synthesis of 1-Naphthols
作者:Tao Lu、Ya-Ting Jiang、Feng-Ping Ma、Zi-Jing Tang、Liu Kuang、Yu-Xuan Wang、Bin Wang
DOI:10.1021/acs.orglett.7b03186
日期:2017.12.1
formation of polysubstituted 1-naphthols. The usage of readily available bromine catalyst, broad substrate scope, and mild conditions make this protocol very practical. Mechanistic investigations reveal that the bromination of phenylethanone derivatives occurs to yield bromo-substituted intermediates, which react in situ with alkynes to furnish the desired 1-naphthols.
required for this reaction. The synthetic utility is demonstrated by pinacol coupling of ketyl radicals and benzannulation of α-carbonyl radicals with alkynes to give a series of highly substituted 1-naphthols in good to excellent yields. The readily available photocatalyst, mild reaction conditions, broad substrate scope, and high functional-group tolerance make this reaction a useful synthetic tool
Hantzsch Ester-Mediated Benzannulation of Diazo Compounds under Visible Light Irradiation
作者:Savita B. Nagode、Ruchir Kant、Namrata Rastogi
DOI:10.1021/acs.orglett.9b02135
日期:2019.8.16
A metal-free benzannulation of diazo compounds under visible light irradiation was developed. The photocatalytic single electron transfer by Hantzschester to the diazo enolates results into enolate vinyl radicals, which were trapped by alkynes leading to functionalized naphthalene-1-ols. The enolate vinyl radicals were also trapped intramolecularly by o-aryl groups to access phenanthren-10-ols. The
Silver(I)-Catalyzed Regioselective Construction of Highly Substituted α-Naphthols and Its Application toward Expeditious Synthesis of Lignan Natural Products
developed for regioselective synthesis of highly substituted α-naphthols, binaphthols, and anthracenol through silver(I) catalyzed C(sp3)–H/C(sp)–H, C(sp2)–H/C(sp)–H functionalization of β-ketoesters and alkynes, respectively, in a single step using water as a solvent. This protocol exhibited broad substrate scope and paved the way for synthesis of anticancer arylnaphthalenelignan natural products such as
Mn(III)-Mediated Facile Access to Polysubstituted α-Naphthols from β-Keto Ester Derivatives and Terminal Alkynes
作者:Yuzhu Yang、Weidong Pan、Lisheng He、Fei Li、Xiaolan Liu
DOI:10.1055/s-0039-1690870
日期:2020.7
A novel manganese-mediated reaction for the synthesis of polysubstituted α-naphthols has been developed from β-keto esters and terminal alkynes. This system holds the advantages of readily available starting materials and mild conditions. Mechanistic investigations revealed that this reaction proceeds via a tandem radical cyclization process.