2 is reported. The synthesis is based upon stereoselectivepreparation of functionalized isoprenoid chains, ether-linkage formation between the isoprenoid chains with a glycerol derivative, and the ultimate intramolecular dicarbonyl coupling using low-valent titanium known as McMurry coupling. This syntheticmethod has successfully provided the first practical route to chemically defined archaeal macrocyclic
The first synthesis of an archaebacterial 36-membered macrocyclic diether lipid
作者:Tadashi Eguchi、Takumi Terachi、Katsumi Kakinuma
DOI:10.1039/c39940000137
日期:——
The archaebacterial macrocyclic diether lipid featuring a 36-membered ring is synthesized by the McMurry coupling as a key step.
关键步骤是通过麦克马里偶联合成具有 36 元环的古细菌大环二元脂。
36-Membered Macrocyclic Diether Lipid is Advantageous for Archaea to Thrive under the Extreme Thermal Environments
作者:Kenji Arakawa、Tadashi Eguchi、Katsumi Kakinuma
DOI:10.1246/bcsj.74.347
日期:2001.2
that the macrocyclic structure led to a decrease in the fluidity in the inter-membrane hydrophobic part more than in the membrane surface by limiting the motional freedom of the alkyl chains. The proton permeability was also significantly reduced by introducing a macrocyclic structure. Liposomal thermostability measurements using 6-carboxyfluorescein (CF) suggested that 36MPC formed liposomes with greater
An Olefin Metathesis Approach to 36- and 72-Membered Archaeal Macrocyclic Membrane Lipids
作者:Kenji Arakawa、Tadashi Eguchi、Katsumi Kakinuma
DOI:10.1021/jo980472k
日期:1998.7.1
An olefin metathesis approach, which has been successfully applied to an efficient synthesis of archaeal 36- and 72-membered macrocyclic membrane lipids (1, 2a, and 2b), is reported. In the presence of a Grubbs' ruthenium-alkylidene complex, RuCl2(=CHPh)(PCy3)(2) (3), a ring-closing metathesis (RCM) reaction of alpha,omega-diene 5 efficiently proceeded in 79% yield under high dilution conditions to give 36-membered 6. By changing the reaction conditions, a acyclic diene metathesis (ADM) product 7 was predominantly formed from the same substrate 5. The acyclic product 7 was subsequently subjected to the RCM reaction under high dilution conditions to provide 72-membered compound 8 in 45% yield. Final catalytic hydrogenation of 6 and 8 afforded the 36-membered lipid I and a mixture of the 72-membered lipid 2a and 2b, respectively. The present synthetic method appears to be of significant advantage for the synthesis of such giant ring structures of the 36- and 72-membered lipids, because both of the macrocylic lipids can be obtained in a short step at will from the same starting material only by changing the order and conditions of the metathesis reaction.
A Unified Approach for the Total Synthesis of
<i>cyclo</i>
‐Archaeol,
<i>iso</i>
‐Caldarchaeol, Caldarchaeol, and Mycoketide
作者:Ruben L. H. Andringa、Niels A. W. Kok、Arnold J. M. Driessen、Adriaan J. Minnaard
DOI:10.1002/anie.202104759
日期:2021.8.2
the strategy par excellence to prepare saturated isoprenoids and mycoketides. This highly stereoselective synthesisapproach is combined with an established 13C-NMR method to determine the enantioselectivity of each methyl-branched stereocenter. It is shown that this analysis is fit for purpose and the combination allows the synthesis of the title compounds with a significant increase in efficiency