A new synthetic route to 2-substituted naphtho[2,3-<i>b</i>]furan-4,9-dione2-Substituted Naphtho[2,3-<i>b</i>]furan-4,9-dione
作者:Jyunichi Koyanagi、Katsumi Yamamoto、Kouji Nakayama、Akira Tanaka
DOI:10.1002/jhet.5570340209
日期:1997.3
9-Dimethoxynaphtho[2,3-b]furan 9 was obtained in 91% yield via the reductive methylation of naphtho[2,3-b]furan-4,9-dione 2. After treatment of 9 with butyllithium, the mixture was allowed to react with N,N-dimethylacetamide, followed by oxidization with cerium(IV) diammonium nitrate to give 2-acetylnaphtho[2,3-b]furan-4,9-dione 1. 2-Formylnaphtho[2,3-b]furan-4,9-dione 13 and 2-trimethylsilyl-naphtho[2,3-b]furan-4
4,9-二甲氧基萘并[2,3- b ]呋喃9是在91%的收率得到经由萘并[2,3-的还原甲基化b ]呋喃-4,9-二酮2。用丁基锂处理9后,使混合物与N,N-二甲基乙酰胺反应,然后用硝酸铈(IV)二铵氧化,得到2-乙酰基萘[2,3 - b ]呋喃-4,9-二酮1。2- Formylnaphtho [2,3- b ]呋喃-4,9-二酮13和2-三甲基甲硅烷-萘并[2,3- b ]呋喃-4,9-二酮14也从获得9通过类似的方法。的halodesilylations 14容易得到2- iodonaphtho [2,3- b ]呋喃-4,9-二酮16,2-bromonaphtho [2,3- b ]呋喃-4,9-二酮17,和2- chloronaphtho [2- ,3 - b ]呋喃-4,9-二酮18的产率分别为82%,93%和83%。此外,14的氮杂硅烷基化以77%的产率得到2-硝基萘[2,3