150239-12-6Relevant articles and documents
Use of a semihollow-shaped triethynylphosphane ligand for efficient formation of six- and seven-membered ring ethers through gold(I)-catalyzed cyclization of hydroxy-tethered propargylic esters
Ito, Hideto,Harada, Ayumi,Ohmiya, Hirohisa,Sawamura, Masaya
supporting information, p. 647 - 652 (2013/04/10)
The formation of six- and seven-membered ring ethers from hydroxy-tethered propargylic esters was efficiently catalyzed by a cationic gold(I) complex with a semihollow-shaped triethynylphosphane ligand. This gold catalysis showed a tolerance toward the reactions of primary, secondary, and tertiary alcohol substrates with various substitution patterns. A sterically congested 2,2,6,6-tetraalkyl-substituted tetrahydropyran derivative as well as 6,6- and 7,6-fused bicyclic diethers were obtained in useful yields. In addition, the gold catalysis was applicable to the reaction of a sulfonamide-tethered propargylic ester to give a piperidine derivative. Copyright
New masked δ-lithiocarbonyl compounds: Preparation and synthetic applications
Gil, Juan F.,Ramon, Diego J.,Yus, Miguel
, p. 4923 - 4938 (2007/10/02)
The reaction of 2-(4-chlorobutyl)-1,3-dioxolanes (1a-c) or 2-(4-chlorobutyl)-2-ethyl-1,3-dithiane (1d) with an excess of lithium powder and a catalytic amount of naphthalene (8 mol %) in THF at - 78°C leads to a solution of the corresponding masked lithiu
