Preparation of silyl polyenol ethers by carbonyl olefination of silyl esters
作者:Takeshi Takeda、Tatsuya Fukada、Akira Tsubouchi
DOI:10.1016/j.tetlet.2014.01.040
日期:2014.2
Silyl enol ethers were produced by the carbonyl olefination of silylesters with titanium carbene complexes generated by the desulfurizative titanation of thioacetals. The regioselective preparation of silyl dienol and trienol ethers has been achieved by using unsaturated silylesters and thioacetals.
Divergent Synthesis of Bioactive Resorcinols Isolated from the Fruiting Bodies of <i>Hericium erinaceum</i>: Total Syntheses of Hericenones A, B, and I, Hericenols B–D, and Erinacerins A and B
series of natural products by divergent functional group manipulations. The crucial C5′-oxygen functionality was installed at the initial stage by alkylation by an α-cyano ethoxyethyl ether. From a common synthetic intermediate, eight total syntheses including hericenones A, B, and I, hericenols B–D, and erinacerins A and B were achieved (hericenol B and erinacerin B were synthesized as racemates). The structure
6-Oxodendrolasin, 6-hydroxydendrolasin, 9-oxofarnesol and 9-hydroxyfarnesol, stress metabolites of the sweet potato
作者:Leo T. Burka、Lawrence J. Felice、Stephen W. Jackson
DOI:10.1016/0031-9422(81)85150-3
日期:1981.1
Abstract Four sesquiterpene stressmetabolites, 6-oxodendrolasin, 6-hydroxydendrolasin, 9-oxofarnesol, and 9-hydroxyfarnesol have been isolated from mercuric chloride-treated sweetpotatoes. The metabolites have been synthesized and feeding studies have been carried out to determine the extent of incorporation of 14 C-labelled 6-oxodendrolasin and 9-hydroxyfarnesol into ipomeamarone.
摘要 从氯化汞处理的甘薯中分离出四种倍半萜烯胁迫代谢物,6-氧代树胶素、6-羟基树胶素、9-氧代法呢醇和 9-羟基法呢醇。已经合成了代谢物并进行了喂养研究,以确定 14 C 标记的 6-氧代树胶素和 9-羟基法尼醇掺入伊波马隆的程度。
Stereochemical elucidation of the 1,4 polyketide amphidinoketide I
作者:Louise M Walsh、Jonathan M Goodman
DOI:10.1039/b309104j
日期:——
The relative and absolute stereochemistry of amphidinoketide I has been determined by the total synthesis of all the diastereoisomers. Molecular modelling suggests that the natural product is not the thermodynamically preferred diastereoisomer.
The dithiane 11 is alkylated with prenyl bromide to give 12. Hydrogenolysis of 12 with Raney-Nickel yields α-curcumene (6), hydrolysis of 12 gives the ketone 13. Prenal dithiane (14) is alkylated with 8 to give 15. ar-Turmerone (16) is formed by hydrolysis of 15. Reaction of 15 with sodium in liquid ammonia leads to a mixture of α-curcumene (6) and β-curcumene (10).