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。