An asymmetric synthesis of the furanocembrane (-)-bipinnatin J (3a) found in gorgonian corals is described. Treatment of 3a with VO(acaC)(2)-'BuOOH, followed by acetylation, gave acetoxypyranone 15. When 15 was heated in the presence of DBU, it underwent a transannular oxidopyrylium-alkene [5+2] cycloaddition producing the polycyclic diterpene (+)-intricarene 1, isolated from the coral Pseudopterogorgia kallos. The total synthesis of intricarene 1 mimics its most likely biosynthesis via oxidation of bipinnatin J (3a) in vivo. (c) 2006 Elsevier Ltd. All rights reserved.
Antibacterial compounds of formula (I) are provided, as well as stereoisomers and pharmaceutically acceptable salts thereof; pharmaceutical compositions comprising such compounds; methods of treating bacterial infections by the administration of such compounds; and processes for the preparation of such compounds.
Studies toward the Synthesis of an Oxazole-Based Analog of (−)-Zampanolide
作者:Christian P. Bold、Cindy Klaus、Bernhard Pfeiffer、Jasmine Schürmann、Rafael Lombardi、Daniel Lucena-Agell、J. Fernando Díaz、Karl-Heinz Altmann
DOI:10.1021/acs.orglett.1c00378
日期:2021.3.19
Studies are described toward the synthesis of an oxazole-based analog of (−)-zampanolide (2). Construction of (−)-dactylolide analog 22 was achieved via alcohol 5 and acid 4 through esterification and Horner–Wadsworth–Emmons (HWE)-based macrocyclization; however, attempts to attach (Z,E)-sorbamide to 22 proved unsuccessful. The C(8)–C(9) double bond of the macrocycle was prone to migration into conjugation
Total Synthesis of (−)-Dactylolide and Formal Synthesis of (−)-Zampanolide via Target Oriented β-<i>C</i>-Glycoside Formation
作者:Fei Ding、Michael P. Jennings
DOI:10.1021/jo8009853
日期:2008.8.1
The totalsynthesis of (−)-dactylolide and formal synthesis of (−)-zampanolide via target oriented β-C-glycoside formation is described. The two key reactions involved a stereoselective reduction of the appropriate oxocarbenium cation and a highly chemo- and diastereoselective ring-closing metathesis protocol for the formation of the macrocyclic core. In addition to the described chemistry, in vitro
作者:Thomas R. Hoye、Michael E. Danielson、Aaron E. May、Hongyu Zhao
DOI:10.1021/jo101598y
日期:2010.11.5
has been achieved. The core macrocycle was made via a dual macrolactonization/pyran hemiketal formation reaction, developed to circumvent issues related to the reversible nature of acylketene formation from β-keto lactone substrates. Initial approaches to the core of the natural product that revolved around ring-closingmetathesis (RCM) and relay ring-closingmetathesis (RRCM) reactions are also described
(-)-callipeltoside A ( 1 )的全合成已经实现。核心大环是通过双重大环内酯化/吡喃半缩酮形成反应制成的,开发该反应是为了避免与 β-酮内酯底物形成酰基烯酮的可逆性质相关的问题。还描述了围绕闭环复分解 (RCM) 和中继闭环复分解 (RRCM) 反应的天然产物核心的初步方法。
Studies toward the total synthesis of nakiterpiosin: construction of the CDE ring system by a transannular Diels–Alder strategy
The transannular Diels–Alder (TADA) reaction was applied to the synthesis of the CDE ring system of nakiterpiosin (1). Tetracyclic compound 25 may be a key intermediate in the totalsynthesis of 1.