Oxidativecleavage of the carbon-carbon double bond of α-substituted styrene derivatives proceeds under an atmospheric pressure of molecularoxygen at the solventless conditions to afford the corresponding ketones in moderate yields with no requirement for transition metal catalysts or photo-activation.
Zeolite-Promoted Oxidations of 1,1-Diarylethylenes
作者:Edward L. Clennan、Gui-lan Pan
DOI:10.1021/ol035927t
日期:2003.12.1
been examined. Several intermediates, including an epoxide, have been identified by comparison to independently synthesized samples. Aldehyde intermediates were shown to undergo intrazeolite NorrishtypeIcleavages in competition with a novel new photooxygenation/autoxidation reaction. [reaction: see text]
Generation of oxiranyllithiums and oxiranyl Grignard reagents having a carbanion-destabilizing group from sulfinyloxiranes: Their property and an application to asymmetric synthesis of epoxides and alcohols
The first generation of oxiranyllithiums and oxiranyl Grignardreagents having a carbanion-destabilizing group (alkyl group) was realized from sulfinyloxiranes via the ligand exchange reaction of sulfoxides with tert-butyllithium or ethylmagnesium chloride in THF at −80 to −100°C. The generated oxiranyllithiums were found to be very unstable; however, these anions reacted with several electrophiles
We achieved intra- and intermolecular C(sp3)–H alkoxylation of benzylic positions of heteroaromaticcompounds using CuBrn (n = 1, 2)/5,6-dimethylphenanthroline (or 4,7-dimethoxyphenanthroline) and (tBuO)2 as a catalyst and an oxidant, respectively. The reaction proceeded at both terminal and internal benzylic positions of the alkyl groups. The intramolecular alkoxylation was performed on a gram scale