Clavaminols G–N, six new marine sphingoids from the Mediterranean ascidian Clavelina phlegraea
摘要:
An exhaustive examination of the chemical constituents of the Mediterranean ascidian Clavelina phlegraea led to the isolation of clavaminols G-N (1-6), a new series of amino alcohols, which expand the family of modified marine sphingoids. Structures of the novel compounds 1-6 have been elucidated by spectroscopic analysis and chemical derivatization: bioactivities of compounds 1-6 have also been investigated and comparison of their pharmacological properties with those of previously isolated clavaminols A-F allowed us to perform an assessment of simple structure-activity relationships. (C) 2009 Elsevier Ltd. All rights reserved.
Retracted Article: A highly concise and practical route to clavaminols, sphinganine and (+)-spisulosine <i>via</i> indium mediated allylation of α-hydrazino aldehyde and a theoretical insight into the stereochemical aspects of the reaction
作者:Menaka Pandey、Partha Sarathi Chowdhury、Achintya Kumar Dutta、Pradeep Kumar、Sourav Pal
DOI:10.1039/c3ra43048k
日期:——
The stereoselective synthesis of 1,2-amino alcohols is reported by proline-catalyzed α-amination of aldehyde and one-pot indium mediated allylation of the crude α-hydrazino aldehydes.
chiral sulfonium salts, derived fromL- and D-methionine, has been designed and successfully employed in our laboratories for the diastereoselective synthesis of glycidic amides. The epoxy amides obtained were converted cleanly into 1,2-difunctionalized products through oxirane ring-opening reactions with different types of nucleophiles. The resulting ring-opened products represent valuable and useful
一类新的手性锍盐衍生自 L- 和 D-甲硫氨酸,已被设计并成功用于我们实验室的缩水甘油酰胺的非对映选择性合成。获得的环氧酰胺通过与不同类型亲核试剂的环氧乙烷开环反应完全转化为 1,2-双官能化产物。由此产生的开环产品代表了合成不同生物活性产品的有价值和有用的构建模块。因此,已经实现了克拉维醇 H 的便利合成以及其他生物活性化合物的关键前体的合成,例如聚酮衍生的天然产物,证明了这种化学的合成效率和实用性。
Total synthesis of clavaminol A, C and H
作者:Ahmed M. Zaed、Andrew Sutherland
DOI:10.1039/c1ob06060k
日期:——
synthesis of clavaminol A and C, (2R,3S)-2-amino-3-alkanols from the Mediterranean ascidian Clavelina phlegraea has been achieved in 29% overall yield. The key step involved a palladium(II)-catalyseddirected Overman rearrangement to create the C–N bond and install the erythro configuration while a one-pot, tributyltin hydride-mediated reduction allowed simultaneous formation of the methyl side-chain
A highly concise and expedient totalsynthesis of bioactive clavaminols (1–4) has been executed using commercially available achiral compound decanol. The synthetic strategy relied on trans-Wittig olefination, Sharpless asymmetric epoxidation, regioselective azidolysis and in situ detosylation followed by reduction as key reactions with good overall yield. Based on biological evaluation studies of
已经使用可商购的非手性化合物癸醇进行了高度简洁,方便的生物活性克拉维醇的全合成(1-4)。合成策略依赖于反维特希(Wittig)烯化,Sharpless不对称环氧化,区域选择性叠氮分解和原位脱甲苯磺酸化,然后还原为关键反应,具有良好的总收率。基于对所有合成化合物的生物学评估研究,观察到克拉维酚A(1)对DU145和SKOV3细胞系表现出良好的细胞毒性,IC 50值分别为10.8和12.5μM 。克拉维醇A(1)和脱乙酰基克拉维醇H(3))显示出对革兰氏阳性病原细菌菌株的选择性有希望的抑制作用,并且对测试的念珠菌菌株显示出良好的抗真菌活性。另外,化合物1和3已显示出显着的杀菌活性。发现化合物3与标准药物咪康唑等价,对白念珠菌MTCC 854,C的MFC值为15.6μg/ mL 。albicans MTCC 1637,C。白色念珠菌MTCC 3958和光滑念珠菌MTCC3019。化合物1和3还能够抑制生物膜形成的藤黄微球菌MTCC
Clavaminols G–N, six new marine sphingoids from the Mediterranean ascidian Clavelina phlegraea
An exhaustive examination of the chemical constituents of the Mediterranean ascidian Clavelina phlegraea led to the isolation of clavaminols G-N (1-6), a new series of amino alcohols, which expand the family of modified marine sphingoids. Structures of the novel compounds 1-6 have been elucidated by spectroscopic analysis and chemical derivatization: bioactivities of compounds 1-6 have also been investigated and comparison of their pharmacological properties with those of previously isolated clavaminols A-F allowed us to perform an assessment of simple structure-activity relationships. (C) 2009 Elsevier Ltd. All rights reserved.