Total Synthesis and Structural Revision of the Marine Macrolide Neopeltolide
作者:Daniel W. Custar、Thomas P. Zabawa、Karl A. Scheidt
DOI:10.1021/ja710080q
日期:2008.1.1
The totalsynthesis and structural revision of the marine natural product neopeltolide is reported. The key bond-forming step involves a Lewis acid-catalyzed intramolecular cyclization to install the tetrahydropyran ring and the macrocycle simultaneously. This type of cyclization is the first of its kind and assembles the carbon backbone of the natural product efficiently. The synthesis of the reported
Total Synthesis and Structure−Activity Investigation of the Marine Natural Product Neopeltolide
作者:Daniel W. Custar、Thomas P. Zabawa、John Hines、Craig M. Crews、Karl A. Scheidt
DOI:10.1021/ja904604x
日期:2009.9.2
The total synthesis and biologicalevaluation of neopeltolide and analogs are reported. The key bond-forming step utilizes a Lewis acid-catalyzed intramolecular macrocyclization that installs the tetrahydropyran ring and macrocycle simultaneously. Independent of each other, neither the macrolide nor the oxazole sidechain substituents of neopeltolide can inhibit the growth of cancer cell lines. The
Synthesis of<i>anti</i>-1,3-Diols through RuCl<sub>3</sub>/PPh<sub>3</sub>-Mediated Hydrogenation of β-Hydroxy Ketones: An Alternative to Organoboron Reagents
Hydrogenation of enantioenriched β-hydroxyketones promoted by the catalyst generated in situ from commercially available and inexpensive RuCl3 and PPh3 under hydrogen pressure allowed the efficient preparation of a variety of anti-1,3-diols in good yields and with a high level of diastereoselectivity. This method should be an interesting alternative to organoboronreagents for the diastereoselective
A stereoselective totalsynthesis of the phytotoxic com- pound herbarumin III has been achieved by utilizing Crimmins's aldol approach, 1,3-syn asymmetric reduction, and an olefin meta- thesis reaction as the key steps.
通过利用 Crimmins 的羟醛方法、1,3-syn 不对称还原和烯烃复分解反应作为关键步骤,实现了植物毒性化合物 herbarumin III 的立体选择性全合成。
Participation of the β-hydroxyketone part for potent cytotoxicity of callystatin A, a spongean polyketide
The participation of the beta -hydroxyketone part of callystatin A in the potent cytotoxicity was analyzed through the analogue-syntheses and the assessment of their biological potencies. The ketonic carbonyl, the 19-hydroxyl, and the three asymmetric methyl groups located in the beta -hydroxyketone part of callystatin A were revealed to contribute to the cytotoxic potency, respectively. Moreover, the alpha,beta -unsaturated delta -lactone portion was shown to serve as a conclusive functional group for the cytotoxic activity. (C) 2000 Elsevier Science Ltd. All rights reserved.