A Direct One-Pot Synthesis of Naphtho[2,3-<b>
<i>b</i>
</b>]furan-4,9-dione Derivatives via C,O-Dialkylation of β-Dicarbonyl Compounds by 2,3-Dichloro-1,4-naphthoquinones
作者:Jian-Hua Xu、Hua-You Hu、Ye Zhu、Lei Wang
DOI:10.1055/s-2005-865305
日期:——
Base-promoted reactions of acyclic and cyclic β-dicarbonyl compounds (3) with 2,3-dichloro-1,4-naphthoquinone (1) and 4a,6,7,8a-tetrachloro-1,4-methanonaphthalene-5,8-dione (2) resulted in C,O-dialkylation of 3 to give 2,3-disubstituted naphtho[2,3-b]furan-4,9-diones (4) and 5,8-methanonaphtho[2,3-b]furan-4,9-diones (6) respectively in moderate to high yields.
无环和环状β-二酮化合物(3)在碱促反应中与2,3-二氯-1,4-萘醌(1)和4a,6,7,8a-四氯-1,4-美克萘-5,8-二酮(2)反应,导致3的C,O-双烷基化反应,分别产生2,3-二取代萘[2,3-b]呋喃-4,9-二酮(4)和5,8-美克萘[2,3-b]呋喃-4,9-二酮(6),产率中等至高。