通过解卷积激子耦合 CD⊥ 对来自 Leucetta microrhaphis 的 α,ω-双功能化鞘脂 Leucettamol A 的绝对构型
摘要:
leucettamol A ( 1 )的构型是一种已知的来自海洋海绵Leucetta microrhaphis 的长链“双头”鞘脂(二聚鞘脂),通过转化为N , N' , O , O '-四苯甲酰衍生物来确定,激子耦合圆二色光谱 (ECCD) 的测量,以及通过叠加激子对的解卷积进行的定量分析。与之前声称 leucettamol A ( 1 ) 是外消旋的分配相反,CD 方法明确地揭示了天然产物是手性和光学活性的,并显示出伪C 2对称性。链的每一端的配置有赤型立体化学,绝对构型为 2 R ,3 S ,28 S ,29 R。我们表明,与基于1 H NMR J的方法相比,解卷积 ECCD在所有情况下以更高的灵敏度 (<5 nmol)可靠地预测赤型与苏型邻氨基醇,并提供光学纯度的验证和这一困难类别中绝对构型的明确阐明天然产品。
DOI:
10.1021/np800549n
作为产物:
描述:
leucettamol A 在
palladium on activated charcoal 、 氢气 作用下,
以
甲醇 为溶剂,
反应 24.0h,
以2.6 mg的产率得到hexahydroleucettamol A
Absolute Configuration of the α,ω-Bifunctionalized Sphingolipid Leucettamol A from <i>Leucetta microrhaphis</i> by Deconvoluted Exciton Coupled CD
作者:Doralyn S. Dalisay、Sachiko Tsukamoto、Tadeusz F. Molinski
DOI:10.1021/np800549n
日期:2009.3.27
the natural product is chiral and optically active and displays pseudo-C2 symmetry. The configuration of each end of the chain has erythro stereochemistry with an absolute configuration of 2R,3S,28S,29R. We show that deconvolution ECCD reliably predicts erythro versus threo vicinal amino alcohols in all cases with greater sensitivity (<5 nmol) compared to 1H NMR J-based methods and provides verification
leucettamol A ( 1 )的构型是一种已知的来自海洋海绵Leucetta microrhaphis 的长链“双头”鞘脂(二聚鞘脂),通过转化为N , N' , O , O '-四苯甲酰衍生物来确定,激子耦合圆二色光谱 (ECCD) 的测量,以及通过叠加激子对的解卷积进行的定量分析。与之前声称 leucettamol A ( 1 ) 是外消旋的分配相反,CD 方法明确地揭示了天然产物是手性和光学活性的,并显示出伪C 2对称性。链的每一端的配置有赤型立体化学,绝对构型为 2 R ,3 S ,28 S ,29 R。我们表明,与基于1 H NMR J的方法相比,解卷积 ECCD在所有情况下以更高的灵敏度 (<5 nmol)可靠地预测赤型与苏型邻氨基醇,并提供光学纯度的验证和这一困难类别中绝对构型的明确阐明天然产品。
Leucettamol A: A new inhibitor of Ubc13-Uev1A interaction isolated from a marine sponge, Leucetta aff. microrhaphis
A compound that inhibits the formation of a complex composed of the ubiquitin E2 enzyme Ubc13 and Uev1A was isolated from the marinespongeLeucetta aff. microrhaphis. The compound was identified as leucettamol A (1) by spectroscopic analysis. Its inhibition of Ubc13-Uev1A interaction was tested by the ELISA method, revealing an IC(50) value of 50 microg/mL. The compound is the first inhibitor of Ubc13-Uev1A