The 5-hydroperoxyfuran-2(5H)-ones 3 are synthesized by acid hydrolysis of the dihydrofurans 1 which are prepared in one-pot procedure by reaction of the corresponding furans 4 with singlet oxygen and methanol. The synthetic method has a wide range of applicability; however, compounds 3 unsubstituted at C-4 cannot be prepared since the corresponding dihydrofurans 1 are not formed.
The first nucleophilic aromatic substitution of suitably activated 2-methoxyfurans with Grignard reagents
作者:M.Rosaria Iesce、M.Liliana Graziano、Flavio Cermola、Stefania Montella、Lucrezia Di Gioia
DOI:10.1016/s0040-4039(03)01430-8
日期:2003.7
The reaction of 2-methoxyfuroates 1 with Grignardreagents 2 leads to tertiary alcohols or SNAr products depending on the position of the alkoxycarbonyl group. OMe-Displacement occurs only for 3-substituted derivatives. It takes place even for 3-acetyl-2-methoxyfuran while the presence of a further ester function at 4 position induces the formation of the sole 4-tertiary alcohol. The OMe-substitution