Base-Mediated Cyclization Reaction of 2-(5-Hydroxy-1-pentynyl)benzonitriles to 4-Amino-2,3-dihydronaphtho[2,3-<i>b</i>]furanes and Synthesis of Furanonaphthoquinones
作者:Chih-Jyun Tsai、Chin-Chau Chen、Chih-Wei Tsai、Ming-Jung Wu
DOI:10.1021/acs.joc.5b02514
日期:2016.5.6
An efficient transformation of 2-(5-hydroxy-1-pentynyl)benzonitriles 5 to furanonaphthoquinones 11 is presented. Treatment of 5 with 1.5 equiv of NaOMe in DMSO at 140 °C for 0.5 h gave 6 in good yields. Conversion of 6 to 11 was carried out by oxidation of 6 with Fremy’s salt and KH2PO4 in acetone and water, followed by dehydrogenation using palladium on charcoal in diphenylether at reflux temperature
提出了2-(5-羟基-1-戊炔基)苄腈5到呋喃萘甲醌11的有效转化。在140°C下用1.5当量的NaOMe在DMSO中处理5对0.5小时,得到的6个收率很好。通过在丙酮和水中的弗雷米氏盐和KH 2 PO 4氧化6,然后在回流温度下用钯/炭在二苯醚中进行脱氢,将6转化为11。