Synthesis and stereochemistry of ceramide B, (2S,3R,4E,6R)-N-(30-hydroxytriacontanoyl)-6-hydroxy-4-sphingenine, a new ceramide in human epidermis
作者:Kenji Mori、Yui Masuda
DOI:10.1016/j.tetlet.2003.10.025
日期:2003.12
pentadecan-15-olide, the enantiomers of 1-pentadecyn-3-ol, and (S)-Garner's aldehyde. Comparison of the 1H NMR spectra of the tetraacetyl derivatives of 1 and 1′ with that of ceramide B, a new protein-bound ceramide in human stratum corneum, revealed it to be (2S,3R,4E,6R)-1.
Detergents are the most frequently applied reagents in membraneprotein (MP) studies. The limited diversity of one-head-one-tailed traditional detergents, however, is far from sufficient for structurally distinct MPs. Expansion of detergent repertoire has a continuous momentum. In line with the speculation that detergent pre-assembly exerts superiority, herein we report for the first time cross-conjugation
去污剂是膜蛋白 (MP) 研究中最常用的试剂。然而,一头一尾传统洗涤剂的有限多样性对于结构不同的 MP 来说还远远不够。洗涤剂品种的扩张势头不断。与去污剂预组装发挥优势的推测一致,本文首次报道了两个系列单体去污剂的交叉共轭,用于构建二聚去污剂的二维库。最佳去污剂在个体 MP 的系统评估中具有独特的偏好。此外,前所未有的混合去污剂 14M8G 和 14M9G 分别实现了转运蛋白 MsbA 的高质量 EM 研究和 G 蛋白偶联受体 A2A AR 的 NMR 研究。鉴于交叉偶联化学物质的丰富性,
Wailes, Australian Journal of Chemistry, 1959, vol. 12, p. 173,186
作者:Wailes
DOI:——
日期:——
First Asymmetric Synthesis of 6-Hydroxy-4-Sphingenine-Containing Ceramides. Use of Chiral Propargylic Alcohols To Prepare a Lipid Found in Human Skin
作者:Jiong Chun、Hoe-Sup Byun、Robert Bittman
DOI:10.1021/jo026240+
日期:2003.1.1
present here the first synthesis of the 6S and 6R diastereoisomers 2 and 3, which represent analogues of (2S,3R)-ceramide (1) having two allylic hydroxyl groups. Chiralpropargylicalcohols 8 and 11, which were prepared by asymmetric dihydroxylation of alpha,beta-unsaturated ester 13 and allylic chloride 22, respectively, were employed as precursors of 2 and 3. Nucleophilic addition of lithiated TBS-protected
Synthetic studies towards naturally occurring γ-(<i>Z</i>)/(<i>E</i>)-alkylidenebutenolides through bimetallic cascade cyclization and an adventitious photoisomerization method
visible light-induced photoisomerization method of γ-(Z)-alkylidenebutenolides to their corresponding E-components was reported in this article. Initially, a series of naturally occurring enantiopure γ-(Z)-alkylidenebutenolides was synthesized by employing a “Pd–Cu” bimetallic cascade cyclization protocol. In the later part, the synthesized γ-(Z)-alkylidenebutenolides were photoisomerized in the presence
本文报道了一种通用且灵活的可见光诱导γ-( Z )-亚烷基丁烯内酯光致异构化为其相应的E-组分的方法。最初,通过采用“Pd-Cu”双金属级联环化方案合成了一系列天然存在的对映体纯 γ-( Z )-亚烷基丁烯内酯。在后面的部分中,合成的 γ-( Z )-亚烷基丁烯内酯在三重光敏剂存在下以合理可接受的产率对 γ-( E )-亚烷基丁烯内酯进行光异构化。采用所开发的方法实现了 goniobutenolides、hygrophorones、ramariolide D、melodorinols/乙酰-melodorinols、versicolactones 和 phomopsolidones 的全合成。