A New Synthetic Method for α-Oxo-β,γ-unsaturated Esters
作者:Hideyuki Sugimura、Kazuhiro Yoshida
DOI:10.1246/bcsj.65.3209
日期:1992.11
α-Oxo-β,γ-unsaturated esters have been prepared in moderate to good yields via a two-step procedure consisting of the boron trifluoride-promoted reaction of 2-(trimethylsiloxy)acrylic esters with acetals, followed by treatment with silica gel in benzene under reflux.
Facile synthesis of pyrido[3,2-b]indole via multicomponent reaction strategy under aerobic conditions
作者:Rongrong Jiang、Youming Wang、Zhenghong Zhou
DOI:10.1016/j.tet.2016.08.050
日期:2016.10
developed an organocatalyzed three-component reaction of 1-acetylindolin-3-ones, β,γ-unsaturatedα-ketoesters and amines, which provide an efficient approach to access polysubstituted 1H-pyrido[3,2-b]indoles. Under the catalysis of 4-methylbenzenesulfonic acid monohydrate, the reactions of a wide range of 1-acetylindolin-3-ones, β,γ-unsaturatedα-ketoesters and amines took place smoothly to generate
我们已经开发了有机物催化的1-乙酰吲哚-3-酮,β,γ-不饱和α-酮酸酯和胺的三组分反应,这为获得多取代的1 H-吡啶并[3,2- b ]吲哚提供了一种有效的方法。在4-甲基苯磺酸一水合物的催化下,各种1-乙酰吲哚-3-酮,β,γ-不饱和α-酮酸酯和胺类的反应顺利进行,生成相应的稠密取代的1 H-吡啶基[3]。在温和的反应条件下,2-2- b ]吲哚衍生物的收率可以接受。另外,以良好的产率实现了代表性产物向生物学上重要的δ-碳卤化物的进一步转化。
Palladium-Catalyzed Asymmetric Formal [3+2] Cycloaddition of Vinyl Cyclopropanes and β,γ-Unsaturated α-Keto Esters: An Effective Route to Highly Functionalized Cyclopentanes
作者:Liang-yong Mei、Yin Wei、Qin Xu、Min Shi
DOI:10.1021/om300896z
日期:2012.11.12
Palladium-catalyzed asymmetricformal [3+2] cycloaddition of vinyl cyclopropanes and β,γ-unsaturated α-keto esters proceeded smoothly in the presence of chiral imidazoline–phosphine ligands to give the corresponding highlyfunctionalized cyclopentanes in good yields along with high diastereo- and enantioselectivities under mild conditions.
Direct Synthesis of β,γ-Unsaturated α-Keto Esters from Aldehydes and Pyruvates
作者:John Mansaray、Jiarui Sun、Shisheng Huang、Weijun Yao
DOI:10.1055/s-0037-1612255
日期:2019.4
methods to synthesize β,γ-unsaturated α-keto esters directly from aldehydes and pyruvates promoted by BF3•Et2O in the presence of Ac2O or by Ti(OEt)4 under mild conditions. A variety of aromatic aldehydes was tolerated to afford the desired products in moderate to excellent yield. Moreover, aliphatic aldehydes and Isatin were also employed to give the γ-alkyl β,γ-unsaturated α-keto esters in moderate yield
Construction of Bicyclo[3.2.1]octanes with Four Stereogenic Centers by Organocatalytic Domino Michael/Aldol Reaction
作者:A. Lefranc、L. Gremaud、A. Alexakis
DOI:10.1021/ol502171h
日期:2014.10.17
An enantio- and diastereoselective organocatalytic domino Michael/Aldol reaction for the direct preparation of synthetically and medicinally relevant bicyclo[3.2.1]octane derivatives with four stereogenic centers, including twoquaternary carbons, has been described. The reaction tolerates a large variety of substituents on β,γ-unsaturated 1,2-ketoesters and cyclic 1,3-ketoesters. It allows for the