Selenium-mediated cyclization reactions of alkenyl-substituted β-ketoesters
作者:William P. Jackson、Steven V. Ley、Alan J. Whittle
DOI:10.1039/c39800001173
日期:——
Phenylselenating agents, in which the counter ion is non-nucleophilic, react with certain alkenyl-substitutedβ-ketoesters to afford cyclized products, some of which can be further rearranged using SnCl4.
New cyclization procedure for alkenyl-substituted β-dicarbonyl compounds using N-phenylselenophthalimide
作者:William P. Jackson、Steven V. Ley、Judith A. Morton
DOI:10.1039/c39800001028
日期:——
N-Phenylselenophthalimide can be used as an effective cyclizing reagent for certain alkenyl-substitutedβ-dicarbonylcompounds to give a number of polyfunctionalised products.
Photocatalytic Spirocyclization of 2-Alk-ω-enyl-Substituted Cycloalkane-1,3-diones
作者:Thorsten Bach、Johannes Hofer、Franziska Pecho
DOI:10.1055/a-2004-3771
日期:——
visible light, various cyclic 2-alk-4-enyl-substituted 1,3-diketones undergo an intramolecular endo-addition (m = 1) onto the doublebond resulting in spirocyclic products (11 examples, 62–92% yield). Both an organic (TXT: thioxanthone, 20 mol%) and an organometallic Ir-based photocatalyst (5 mol%) promote the reaction. Addition of triisopropylthiophenol is required to secure high yields. The spirocyclization
当用可见光照射时,各种环状 2-alk-4-enyl-取代的 1,3-二酮在双键上进行分子内内加成 ( m = 1),产生螺环产物(11 个例子,62-92% 产率). 有机物(TXT:噻吨酮,20 mol%)和有机金属 Ir 基光催化剂(5 mol%)均可促进反应。需要添加三异丙基苯硫酚以确保高产率。2-alk-5-enyl-取代底物 (m = 2) 的螺环化提供了七元内环化和六元外环化产物的混合物。
JACKSON W. P.; LEY S. V.; MORTON J. A., J. CHEM. SOC. CHEM. COMMUN., 1980, NO 21, 1028-1029
作者:JACKSON W. P.、 LEY S. V.、 MORTON J. A.
DOI:——
日期:——
JACKSON W. P.; LEY S. V.; WHITTLE A. J., J. CHEM. SOC. CHEM. COMMUN., 1980, NO 23, 1173-1174