Rhodium(I)-Catalyzed [4+2+2] Cycloadditions of 1,3-Dienes, Alkenes, and Alkynes for the Synthesis of Cyclooctadienes
作者:Paul A. Wender、Justin P. Christy
DOI:10.1021/ja060878b
日期:2006.4.1
The first [4+2+2] cycloadditions involving terminal alkynes and diene-enes, including a fully intramolecular example, are reported resulting in the formation of cyclooctadienes using [RhCl(CO)2]2 (5 mol %) treated with AgSbF6 (10 mol %) as a precatalyst. The reaction is general for a variety of terminal alkynes, as well as variously substituted diene-enes (yields up to 88%).
Rhodium(I)-Catalyzed [2+2+1] Cycloadditions of 1,3-Dienes, Alkenes, and CO
作者:Paul A. Wender、Mitchell P. Croatt、Nicole M. Deschamps
DOI:10.1021/ja0489487
日期:2004.5.1
Initial examples of a Rh(I)-catalyzed [2+2+1] reaction of diene-enes and CO are described. This method allows for the facile, efficient, and diastereoselective construction of a variety of alkenyl cyclopentanones in good to excellent yields. Control studies show that the diene moiety is required for this process as bis-enes do not give the [2+2+1] products under the same conditions.
描述了 Rh(I) 催化的二烯-烯和 CO 的 [2+2+1] 反应的初始实例。这种方法允许以良好到极好的产率轻松、有效和非对映选择性地构建各种烯基环戊酮。对照研究表明,该过程需要二烯部分,因为在相同条件下双烯不会产生 [2+2+1] 产物。
Nickel-Catalyzed Three-Component Connection Reaction of Dimethylzinc, 1,ω-Ene-Diene, and Acetone: Synthesis of 1,2-Disubstituted Cycloalkanes
作者:Yoshinao Tamaru、Masanari Kimura、Keisuke Kojima
DOI:10.1055/s-2004-834908
日期:——
Under nickel catalysis, 1,3,8-nonatrienes and 1,3,9-decatrienes 3 react at room temperature with dimethylzinc and acetone at the alkene and diene termini, respectively, providing 1,2-disubstituted cycloalkanes 4 in good yield. The stereoselectivities of 4 provide useful information about the mechanistic frameworks for the present reaction and related cyclization reaction of Ï-dienynes 1.