General Route to 4a-Methylhydrofluorene Diterpenoids: Total Syntheses of (±)-Taiwaniaquinones D and H, (±)-Taiwaniaquinol B, (±)-Dichroanal B, and (±)-Dichroanone
作者:Mainak Banerjee、Ranjan Mukhopadhyay、Basudeb Achari、Asish Kr. Banerjee
DOI:10.1021/jo052589w
日期:2006.3.31
A general and convergent route for the synthesis of the 4a-methylhydrofluorene diterpenoids has been established through a common hexahydrofluorenoneintermediate (10) obtained via Pd(0)-catalyzed reductive cyclization of a substituted 2-(2-bromobenzyl) methylene cyclohexane (13). The strategy has been successfully utilized for the synthesis of (±)-taiwaniaquinones D (3) and H (5), (±)-taiwaniaquinol
Application of a Domino Friedel−Crafts Acylation/Alkylation Reaction to the Formal Syntheses of (±)-Taiwaniaquinol B and (±)-Dichroanone
作者:Shouchu Tang、Yanfen Xu、Jinmei He、Yongping He、Jiyue Zheng、Xinfu Pan、Xuegong She
DOI:10.1021/ol800513v
日期:2008.5.1
An efficient acid-promoted domino Friedel-Crafts (FC) acylation/alkylation reaction has been developed for the construction of the core 6,5,6-ABC tricyclic skeleton of taiwaniaquinoids. The formal total syntheses of diterpenoids (+/-)-taiwaniaquinol B and (+/-)-dichroanone based on this strategy have been achieved.
作者:Bara Singh、Siddheshwar K. Bankar、Ketan Kumar、S. S. V. Ramasastry
DOI:10.1039/d0sc01932a
日期:——
A palladium-catalysed intramolecular allylic (hetero)arylation strategy for the synthesis of fused cyclopentenes incorporated with all-carbon quaternary and spiro centres is described. The method is straightforward, shows broad scope, proceeds in synthetically useful yields, and provides a rare means to construct complex cyclopentanoids. The reaction is believed to involve a kinetically unfavourable
Synthesis of Taiwaniaquinoids via Nazarov Triflation
作者:Guangxin Liang、Yue Xu、Ian B. Seiple、Dirk Trauner
DOI:10.1021/ja062505g
日期:2006.8.1
A unified approach toward the taiwaniaquinoids that has yielded four natural products is described. A new variant of the Nazarov reaction with concomitant formation of an enol triflate serves as one of the key steps, considerably shortening the synthetic scheme and providing a general entry into this class of bioactive natural products.
Concise syntheses of (±)-dichroanone, (±)-dichroanal B, (±)-taiwaniaquinol B, and (±)-taiwaniaquinone D
作者:George Majetich、Joel M. Shimkus
DOI:10.1016/j.tetlet.2009.02.074
日期:2009.7
The total syntheses of dichronaone and dichroanal B, as well as the formal syntheses of taiwaniaquinol B and taiwaniaquinone D, are reported. (C) 2009 Elsevier Ltd. All rights reserved.