Concise Total Syntheses of Palominol, Dolabellatrienone, β-Araneosene, and Isoedunol via an Enantioselective Diels−Alder Macrobicyclization
作者:Scott A. Snyder、E. J. Corey
DOI:10.1021/ja0576379
日期:2006.1.1
Concisetotalsyntheses of four members of the dolabellane family of diterpenoid natural products are reported. Key features of the developed route include the first demonstration of an enantioselective, intramolecular Type I Diels-Alder macrobicyclization, the first example of a stereoselective pi-allyl Stille coupling reaction involving a farnesyl-derived intermediate, a powerful new reagent for
报道了二萜类天然产物的多拉标烷家族的四个成员的简明全合成。所开发路线的主要特点包括首次展示了对映选择性、分子内 I 型 Diels-Alder 大环化,这是立体选择性 pi-allyl Stille 偶联反应的第一个例子,涉及法呢基衍生的中间体,这是一种用于形成二噻烷的强大新试剂具有酸敏感分子,以及基于改进的沃尔夫光化学重排的独特且高效的环收缩序列。
Thiosulfonic<i>S</i>-Esters; 6. Fluoride-Mediated α-Phenylsulfenylation of Cyclic Ketones and Esters via their Trimethylsilyl Enol Ethers
作者:Romualdo Caputo、Carla Ferreri、Giovanni Palumbo
DOI:10.1055/s-1989-27292
日期:——
Ketones and carboxylic acid esters are conveniently converted to their α-sulfenylated derivatives. This new procedure is likely to represent the first reliable one for regiospecific monosulfenylation of carbonyl compounds. It is based on the reaction of their trimethylsilyl enol ether derivatives with tetrabutylammonium fluoride in the presence of thiosulfonic S-esters, in anhydrous tetrahydrofuran, under mild conditions, at - 70°C for a few minutes.
Synthesis of unsymmetrical 1,4-diketones by the ceric ammonium nitrate promoted cross-coupling of trimethylsilyl enol ethers
作者:Enrico Baciocchi、Angela Casu、Renzo Ruzziconi
DOI:10.1016/s0040-4039(01)80489-5
日期:1989.1
Unsymmetrical 1,4-diketones are prepared in good yields (60–80%) by cerium (IV) ammonium nitrate oxidative cross-coupling between 1,2-disubstituted and 1-substituted trimethylsilyl enol ethers.
Fluorination of Ketones Using Iodotoluene Difluoride
作者:Shoji Hara、Saeko Sato、Masanori Yoshida
DOI:10.1055/s-2005-872105
日期:——
Fluorination of ketones was achieved by the reaction of silyl enol ethers with iodotoluene difluoride in the presence of BF 3 .OEt 2 and a Et 3 N.HF complex.