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
Novel Synthesis of 1,3-Disubstituted Alkyl- and Aralkylnaphthalenes from Methylenetriphenylphosphorane, 1,1-Disubstituted Epoxides, Paraformaldehyde, and Trimethylsilyl Triflate
作者:Kentaro Okuma、Yoshitaka Hirose、Kosei Shioji
DOI:10.1246/cl.2002.438
日期:2002.4
A novel approach toward the synthesis of 3-methylnaphthalenes is achieved by the reaction of 3-methylene-5,5-disubstituted tetrahydrofurans derived from methylenetriphenylphosphorane, 1,1-disubstituted epoxides and paraformaldehyde with trimethylsilyl trifluoromethanesulfonate in the presence of diisopropylethylamine.