The absoluteconfiguration of plakoside A (2S,3R,11R*,12S*)-2-[(2′′′R,5′′′Z,11′′′R*,12′′′S*)-2′′′-hydroxy-11′′′,12′′′-methylene-5′′′-docosenamido]-1-O-[2′-O-(3′′-methyl-2′′-butenyl)-β-d-galactopyranosyl]-11,12-methylene-1,3-docosanediol} was determined as 11S,12R,11′′′S,12′′′R by its degradation to two cyclopropane-containing fatty acids followed by their derivatization with a chiral reagent and subsequent
白果糖苷A (2 S,3 R,11 R *,12 S *)-2-[(2''' R,5''' Z,11''' R *,12''' S *)-2'''-羟基-11'',, 12'''-亚甲基-5''-二十二碳三烯基] -1- O- [2'- O-(3''-甲基-2' ′-丁烯基)-β-d-吡喃半乳糖基] -11,12-亚甲基-1,3-二十二烷二醇}通过降解为两个环丙烷而确定为11 S,12 R,11''' S,12''' R含脂肪酸,然后用手性试剂将其衍生化,然后对所得衍生物进行HPLC分析。
Absolute Configuration of a Ceramide with a Novel Branched-chain Fatty Acid Isolated from the Epiphytic Dinoflagellate,<i>Coolia monotis</i>
The absolute configuration of the chiral center at the C15 position of a novel branched-chain fatty acid derived from a new ceramideisolated from the epiphytic dinoflagellate Coolia monotis was determined to be of R from by reversed-phase HPLC after cleavage to 12-methylpentadecanoic acid and subsequent conversion with the chiral fluorescent reagent, (1R,2R)-2-(2,3-anthracenedicarboximido)cyclohexanol
Synthesis of the Four Stereoisomers of 2,6-Dimethyloctane-1,8-dioic Acid, a Component of the Copulation Release Pheromone of the Cowpea Weevil,<i>Callosobruchus maculatus</i>
A diastereomeric mixture and the four stereoisomers of 2,6-dimethyloctane-1,8-dioic acid (2), a copulation release pheromone of the cowpea weevil, Callosobruchus maculatus, were synthesized. The stereoisomeric purities of the four synthetic isomers of 2 were determined by the HPLC analyses of their bis-2-(2,3-anthracenedicarboximide)-1-cyclohexyl esters.
Enantioselective synthesis of phomallenic acid C, an inhibitor of bacterial FAS II pathway, was successful. Allenyldiyne structure was constructed by a direct anti-SN2′ coupling of propargyl mesylate with diynylindium in the presence of palladium catalyst. Enantiomeric purity was determined by Ohrui–Akasaka method to be 83%ee.
细菌FAS II途径抑制剂磷丙二酸C的对映选择性合成成功。烯丙基二炔结构是通过在钯催化剂存在下,将炔丙基甲磺酸酯与二炔基吡啶直接抗-S N 2'偶联而构建的。通过Ohrui–Akasaka方法测定对映体纯度为83%ee。