Dehydrobromination of 1,2-dibromocyclohexane and related compounds by lithium carbonate in hexamethylphosphoric triamide. An improved synthesis of 1,3-cyclohexadiene and some deuterium-labeled analogs
Fused bicyclic systems through a ni-mediated intermolecular cyclopentenone annulation
作者:Francisco Camps、Amadeu Llebaria、Josep M. Moretó、Lluís Pagès
DOI:10.1016/s0040-4039(00)77686-6
日期:1992.1
The extension of the Ni(CO)4 promoted carbonylative cycloaddition of acetylenes and allyl halides to the 5–8 membered 3-halocycloolefins leads efficiently to the formation of the corresponding 4–5 fused 2-cyclopentenones with high regio and stereoselectivities.
Oxime Radical Promoted Dioxygenation, Oxyamination, and Diamination of Alkenes: Synthesis of Isoxazolines and Cyclic Nitrones
作者:Bing Han、Xiu-Long Yang、Ran Fang、Wei Yu、Chao Wang、Xiao-Yong Duan、Shuai Liu
DOI:10.1002/anie.201203799
日期:2012.8.27
Up the tempo: The intramolecular addition of oxime radicals to CC bonds was achieved by using DEAD and TEMPO to give 4,5‐dihydroisoxazoles as a result of a CO bond‐forming, 5‐exo‐trig cyclization. γ,δ‐Unsaturated ketoximes also reacted to afford cyclicnitrones through CN bond formation. The reactions offer a metal‐free approach for the vicinal difunctionalization of unactivated alkenes.
Ring-fused and spiro cyclopentenones by Ni(CO)4-promoted intermolecular carbonylative cycloaddition of acetylenes with 3-halo- and 1-(halomethyl)cycloalkenes
作者:Lluis Pages、Amadeu Llebaria、Francisco Camps、Elies Molins、Carles Miravitlles、Josep M. Moreto
DOI:10.1021/ja00052a047
日期:1992.12
The title carbonylativecycloaddition of five- to eight-member ring 3-halo- and 1-(halomethyl)cycloalkenes with different acetylenes was studied. From moderate to good yields of ring-fused and spiro cyclopentenone derivatives were obtained, especially in the reaction with acctylenes bearing electron-withdrawing substituents by propa selection of the reaction conditions to avoid the acetylene polyinsertion
Tin-free radical/ionic hydroxymethylation of secondary and tertiary alkyliodides proceeded efficiently in the presence of tetrabutylammonium borohydride as the hydrogen source under atmospheric pressure of CO in conjunction with photoirradiation using black light. Two possible mechanisms were proposed, both of which involve hybrid radical/ionicprocesses.
The invention relates to novel etherified cycloalkanols of the formula ##STR1## wherein X.sub.1 represents oxygen, sulphur or methylene, X.sub.2 represents oxygen or sulphur, A represents an unsubstituted or substituted phenyl radical and n is an integer from 1 to 10 inclusive, and processes for the production thereof. These compounds, especially 2-(4-phenoxyphenoxy)-cyclo-pentan-1-ol, effect a lowering of the lipid content in the blood serum. They are also intermediates for the production of insecticidal cyclopropanecarboxylic acid esters.