Synthesis of Cyclopropane Fatty Acids by C(<i>sp</i><sup>3</sup>)−C(<i>sp</i><sup>3</sup>) Cross-Coupling Reaction and Formal Synthesis of α-Mycolic Acid
manipulations that are often employed in conventional synthetic routes. This method could be applicable to the synthesis of trans‐cyclopropane fatty acids and enantioenriched cyclopropane fatty acids. Formal synthesis of α‐mycolic acid was achieved by the C(sp3)−C(sp3) cross‐coupling reaction of cyclopropane‐containing bifunctional building blocks.
Preparation of fatty acid methyl esters for gas-liquid chromatography
作者:Ken’ichi Ichihara、Yumeto Fukubayashi
DOI:10.1194/jlr.d001065
日期:2010.3
A convenient method using commercial aqueous concentrated HCl (conc. HCl; 35%, w/w) as an acid catalyst was developed for preparation of fatty acidmethylesters (FAMEs) from sterol esters, triacylglycerols, phospholipids, and FFAs for gas-liquid chromatography (GC). An 8% (w/v) solution of HCl in methanol/water (85:15, v/v) was prepared by diluting 9.7 ml of conc. HCl with 41.5 ml of methanol. Toluene
A New Chiral Rh(II) Catalyst for Enantioselective [2 + 1]-Cycloaddition. Mechanistic Implications and Applications
作者:Yan Lou、Manabu Horikawa、Robin A. Kloster、Natalie A. Hawryluk、E. J. Corey
DOI:10.1021/ja047064k
日期:2004.7.1
A novel chiral Rh(II) catalyst (1) is introduced for the [2 + 1]-cycloaddition of ethyl diazoacetate to terminal acetylenes and olefins with high enantioselectivity. The catalyst 1 consists of one acetate bridging group and three mono-N-triflyldiphenylimidazoline-2-one bidentate ligands (DPTI) spanning the Rh(II)-Rh(II) metallic center in a structure that was determined by single-crystal X-ray diffraction
membrane. Some bacterial CLs are known to contain cyclopropane moieties in their acyl chains. Although the CLs are thought to be involved in the innate immune response, there have been few attempts at chemical synthesis of the CLs, and detailed studies of their biological activities are scarce. Thus, we have developed a synthetic route to CLs containingchiral cyclopropane moieties.
Total syntheses of cis-cyclopropane fatty acids: dihydromalvalic acid, dihydrosterculic acid, lactobacillic acid, and 9,10-methylenehexadecanoic acid
作者:Sayali Shah、Jonathan M. White、Spencer J. Williams
DOI:10.1039/c4ob01863j
日期:——
cis-Cyclopropane fatty acids (cis-CFAs) are widespread constituents of the seed oils of subtropical plants, membrane components of bacteria and protozoa, and the fats and phospholipids of animals. We describe a systematic approach to the synthesis of enantiomeric pairs of four cis-CFAs: cis-9,10-methylenehexadecanoic acid, lactobacillicacid, dihydromalvalic acid, and dihydrosterculic acid. The approach commences