Anodic oxidation of 4-methoxy-1-naphthol 1 in the presence of nucleophiles provided the corresponding products 8 - 12 and the dimers 13 and 17 were also produced. The reaction mechanism of the oxidation reaction including the [3 + 2] cycloaddition was investigated. (C) 2002 Elsevier Science Ltd. All rights reserved.
Reactivity of naphthol towards nucleophiles in anodic oxidation
作者:Hesham R El-Seedi、Shosuke Yamamura、Shigeru Nishiyama
DOI:10.1016/s0040-4020(02)00829-3
日期:2002.9
Reactivity of the anodic oxidation of 4-methoxy-1-naphthol 1 in the presence of nucleophiles has been investigated. The reaction with electron-rich alkenic nucleophiles such as 1-methoxy-4-propenylbenzene 2 and isosafrole 3 gave a very high yield, whereas the reaction with dihydropyran 4 and dihydrofuran 5 gave a moderate yield, but with ethyl vinyl ether 6 gave a very low yield of the substituted dihydronaphthofuran derivatives 7-10 and 12, respectively. Unexpectedly, the glycosyl derivative 11 was preferentially produced rather than naphthofuran 10 upon using 5 as a nucleophile. In addition, the dimers 15 and 16 were obtained in moderate yield without addition of nucleophile to 1. The mechanism of the oxidation reactions including the [3+2] and [5+2] cycloaddition were discussed. (C) 2002 Elsevier Science Ltd. All rights reserved.
Anodic oxidation of 4-methoxy-1-naphthol
作者:Hesham R. El-Seedi、Shosuke Yamamura、Shigeru Nishiyama
DOI:10.1016/s0040-4039(02)00544-0
日期:2002.4
Anodic oxidation of 4-methoxy-1-naphthol 1 in the presence of nucleophiles provided the corresponding products 8 - 12 and the dimers 13 and 17 were also produced. The reaction mechanism of the oxidation reaction including the [3 + 2] cycloaddition was investigated. (C) 2002 Elsevier Science Ltd. All rights reserved.