Annulation Strategies for Benzo[<i>b</i>]fluorene Synthesis: Efficient Routes to the Kinafluorenone and WS-5995 Antibiotics
作者:Ghassan Qabaja、Graham B. Jones
DOI:10.1021/jo0056186
日期:2000.10.1
Intramolecular palladium-mediated arylation approaches to benzo[b]fluorenes have been investigated. The methodology has been applied in a short synthesis of tri-O-methylkinafluorenone, providing an effective alternative td Friedel-Crafts-based approaches. During the course of this work, an acid-promoted quinolactonization of naphthoquinones was also developed, providing direct access to either ortho or para isomers as desired. Application of this methodology in syntheses of the antibiotics WS-5995A, WS-5995C, and functional analogues was demonstrated, and antitumoral activity of this class was determined.
An intramolecular arylation route to the kinafluorenones
作者:Ghassan Qabaja、Graham B Jones
DOI:10.1016/s0040-4039(00)00848-0
日期:2000.7
Intramolecular palladium-mediated arylation approaches to benzo[b]fluorenes have been investigated. The methodology has been applied in a short synthesis of kinafluorenone 2, providing an effective alternative to Friedel-Crafts-based approaches. (C) 2000 Elsevier Science Ltd. All rights reserved.
Cu(I)-catalyzed intramolecular cyclizations of substituted 2-iodobenzophenones under thermal and microwave conditions
作者:Reda A. Haggam
DOI:10.1016/j.tet.2013.05.077
日期:2013.8
Novel, easy-to-perform and practical intramolecular Cu(I)-catalyzed cyclizations of substituted 2-iodobenzophenones under thermal and microwave conditions are reported. The isolated cyclized products under microwave conditions are obtained with high yields and with short reaction times offering a valuable and reliable alternative to other protocols for the synthesis of fluorene analogues. (C) 2013 Elsevier Ltd. All rights reserved.
Microwave-assisted intramolecular palladium-mediated cyclizations of <i>o</i>-iodobenzophenones for methoxy fluoren-9-ones
作者:Reda A. Haggam
DOI:10.1080/00397911.2022.2095210
日期:2022.7.18
irradiation is an effective tool in organic reactions that required long reaction times under thermal conditions. Herein substituted 2-iodobenzophenones were transformed into substituted fluoren-9-ones via cesium carbonate and bis(triphenylphosphine) palladium(II) chloride with 56–92% yields within 30–45 min under microwave irradiations. A remarkable decrease in the reaction time with high yield products was