The key role of water in the heterogeneous permanganate oxidation of ω-hydroxy alkenes
作者:Sundarababu Baskaran、Imadul Islam、Padma S. Vankar、Srinivasan Chandrasekaran
DOI:10.1039/c39900001670
日期:——
Potassium permanganate–copper sulphate in dichloromethane in the presence of a catalytic amount of water effects a smooth oxidative cyclization of ω-hydroxyalkenes to ω-lactones in good yields with the net loss of one or more carbon atoms in the process.
A Novel Synthesis of γ,δ-Unsaturated Aldehydes from α-Formyl-γ-lactones
作者:Roger L. Snowden、Robert Brauchli、Simon Linder
DOI:10.1002/hlca.201000447
日期:2011.7
A preparatively useful one‐step transformation of γ,γ‐disubstituted α‐formyl‐γ‐lactones into trisubstituted γ,δ‐unsaturated aldehydes is described, by means of catalytic amounts of either AcOH or AcOEt in the vapor phase over a glass support. A mechanistic rationale is proposed.
Direct formation of epoxyalkylcopper reagents from activated copper and epoxyalkyl bromides and their intranolecular cyclizations
作者:Tse-Chong Wu、Reuben D Rieke
DOI:10.1016/s0040-4039(00)82446-6
日期:——
Epoxyalkylcopper compounds have readily been prepared by the directoxidativeaddition of active copper to epoxyalkyl halides. The intramolecular cyclization of the epoxyalkylcopper reagents via an epoxide cleavage process is described. Significantly, many functional groups can be present in the bromoepoxides yielding highly functionalized carbocycles. The regioselectivity of this cyclization is affected
New organocopper reagents prepared utilizing highly reactive copper
作者:Reuben D. Rieke、Richard M. Wehmeyer、Tse-Chong Wu、Greg W. Ebert
DOI:10.1016/0040-4020(89)80072-9
日期:1989.1
Highly reactive copper solutions have been prepared by the lithium naphthalide reduction of copper(I) iodide/trialkylphosphine complexes. These activated copper solutions will react with organic halides under very mild conditions to form stable organocopper reagents. Significantly, the organocopper reagents can contain considerable functionalities such as ester, nitrile, chloride, epoxide, and ketone