Annulation Strategies for Benzo[b]fluorene Synthesis: Efficient Routes to the Kinafluorenone and WS-5995 Antibiotics
摘要:
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.
Annulation Strategies for Benzo[b]fluorene Synthesis: Efficient Routes to the Kinafluorenone and WS-5995 Antibiotics
摘要:
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.
Synthesis of C-aryl glycosides related to the chrysomycins
作者:David J Hart、Gregory H Merriman、David G.J Young
DOI:10.1016/0040-4020(96)00876-9
日期:1996.11
A synthesis of chrysomycin substructure 44 is described in which a Ramberg-Backlund reaction plays a key role. Electrochemical oxidation of 44 provided 45, and unsuccessful attempts to convert 45 to chrysomycin B (2) are presented.
Koyama, Hiroya; Kamikawa, Tadao, Journal of the Chemical Society. Perkin transactions I, 1998, # 2, p. 203 - 209
作者:Koyama, Hiroya、Kamikawa, Tadao
DOI:——
日期:——
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.
Regioselective lactonization of naphthoquinones: synthesis and antitumoral activity of the WS-5995 antibiotics
作者:Ghassan Qabaja、Elisabeth M. Perchellet、Jean-Pierre Perchellet、Graham B Jones
DOI:10.1016/s0040-4039(00)00329-4
日期:2000.4
An acid promoted quinolactonization of naphthoquinones has been 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 analogs is demonstrated. Preliminary antitumoral activity of the analogs is presented together with electrochemical analysis. (C) 2000 Elsevier Science Ltd. All rights reserved.