Organic synthesis using haloboration reaction. Part 7. A stereospecific synthesis of (Z)-.delta.-halo-.gamma.,.delta.-unsaturated ketones via haloboration reaction of terminal alkynes
Simple Synthesis of (<i>Z</i>)-12-Nonadecen-9-one, (<i>Z</i>)-13-Icosen-10-one, the Sex Pheromone of Peach Fruit Moth, and (<i>Z</i>)-5-Undecen-2-one, a Biologically Active Molecule from the Pedal Gland of the Bontebok
A simple and convenient synthesis of (Z)-12-nonadecen-9-one, (Z)-13-icosen-10-one, the sex pheromone of the peach fruit moth, and (Z)-5-undecen-2-one, the pheromone from the pedal gland of the bontebok, is described. These pheromones were readily synthesized using successive alkylation of acetone dimethylhydrazone in one-pot.
A new procedure for the reductive desulfonylation of β-keto sulfones is described. The reaction proceeds under a photochemical conditions with the Hantzschester in pyridine in the presence of ruthenium(II). Various functional groups are unaffected under the reaction conditions. Application of the procedure to the syntheses of certain natural products is also described.
描述了一种用于 β-酮砜还原脱磺酰化的新程序。在钌 (II) 存在下,该反应在光化学条件下与在吡啶中的 Hantzsch 酯进行。各种官能团在反应条件下不受影响。还描述了该程序在某些天然产物合成中的应用。
One-Pot Regio- and Stereoselective Cyclization of 1,2,<i>n</i>-Triols
作者:Tao Zheng、Radha S. Narayan、Jennifer M. Schomaker、Babak Borhan
DOI:10.1021/ja043002i
日期:2005.5.1
A simple and efficient process to cyclize triols containing a 1,2-diol functionality with a pendant hydroxyl group is presented. The one-pot procedure converts the 1,2-diol into an ortho ester in situ, which upon treatment with a Lewis acid generates a cyclic acetoxonium intermediate. This intermediate is subsequently trapped by the pendant hydroxyl group to generate a cyclic ether. The stereochemistry
Mild and efficient catalytic method for α-trimethylsilyl ketones
作者:Chunrui Sun、Jingwei Li、Silviya Demerzhan、Daesung Lee
DOI:10.3998/ark.5550190.0012.403
日期:——
A mild, efficient and convenient method for the synthesis of α-silyl ketones from corresponding aldehydes and trimethylsilyldiazomethane in the presence of a catalytic amount of indium(III) chloride has been developed.
Dimerization Behavior of Substituted Bicyclo[3.1.0]hex-1-ene Derivatives
作者:Jun-Cheng Zheng、Huaqing Liu、Nam-Kyu Lee、Daesung Lee
DOI:10.1002/ejoc.201301575
日期:2014.1
individual steps along the reaction pathway including a Brook rearrangement, elimination of lithium trimethylsilanolate to form alkylidene carbenes, and their addition to an alkene to form strained bicyclo[3.1.0]hex-1-ene derivatives were significantly affected by the substituents near or on the alkene moiety. Especially, the dimerization of bicyclo[3.1.0]hex-1-enes depends critically on the substituent pattern
描述了三甲基甲硅烷基重氮甲烷锂与各种 4-烯基酮的不同反应曲线。发现沿着反应途径的各个步骤包括布鲁克重排、消除三甲基硅烷醇化锂以形成亚烷基卡宾,以及它们与烯烃的加成以形成应变的双环 [3.1.0] 己-1-烯衍生物显着受以下因素的影响:烯烃部分附近或上的取代基。特别是,双环[3.1.0]己-1-烯的二聚反应关键取决于烯烃的取代基模式,该模式控制反应以协同或逐步方式进行。在 X 射线衍射分析的基础上,明确阐明了具有前所未有的结构复杂性的二聚体。