An investigation into the total synthesis of clerocidin: stereoselective synthesis of a clerodane intermediate
摘要:
A key clerodane intermediate was prepared during the investigation of the total synthesis of clerocidin. The diterpene backbone was synthesized by an enantioselective Robinson annulation followed by trapping of the enolate using allyl bromide. Selective hydrogenation conditions were developed to introduce the axial methyl group at the C-8 position. A palladium-mediated carbonylation reaction was employed to generate the key alpha,beta-unsaturated dialdehyde. (C) 1998 Elsevier Science Ltd. All rights reserved.
Formation of the C11-C1' bond through application of Barton's radical decarboxylation and quinoneaddition is the cornerstone of a new convergent and concise synthesis of the marine metabolites avarol (1) and avarone (2; see scheme), for which antimitotic, antileukemic, and antiviral effects have been reported.
Unified Synthesis of Quinone Sesquiterpenes Based on a Radical Decarboxylation and Quinone Addition Reaction
作者:Taotao Ling、Erwan Poupon、Erik J. Rueden、Sun H. Kim、Emmanuel A. Theodorakis
DOI:10.1021/ja027517q
日期:2002.10.1
several quinone sesquiterpenes is described herein. Essential to this strategy is a novel radical additionreaction that permits the attachment of a fully substituted bicyclic core 16 to a variably substitutedquinone 10. The addition product 15 can be further functionalized, giving access to natural products with a high degree of oxygenation at the quinone unit. The quinoneadditionreaction is characterized