Nitrosation of Phenolic Substrates under Mildly Basic Conditions: Selective Preparation of <i>p</i>-Quinone Monooximes and Their Antiviral Activities
作者:Tsutomu Ishikawa、Toshiko Watanabe、Hisashi Tanigawa、Tatsuru Saito、Ken-Ichiro Kotake、Yoshiaki Ohashi、Hisashi Ishii
DOI:10.1021/jo951873s
日期:1996.1.1
Nitrosation of 3-methoxyphenol and 1-naphthol were examined under both acidic (NaNO(2)-EtCO(2)H-H(2)O) and basic (i-AmNO(2)-K(2)CO(3)-DMF) conditions. Acidic nitrosations afforded ortho-directed products, whereas para-directed nitrosations were observed under basic conditions to yield p-quinone monooximes. The basic para-directed nitrosation was further examined using 15 phenols, two naphthols, and
在酸性(NaNO(2)-EtCO(2)HH(2)O)和碱性(i-AmNO(2)-K(2)CO(3)-DMF下都检查了3-甲氧基苯酚和1-萘酚的亚硝化) 条件。酸性亚硝化提供了邻位定向的产物,而在碱性条件下观察到对位亚硝化可生成对醌单肟。使用15个酚,两个萘酚和四个酚杂环进一步检查了基本的对位亚硝化反应。一锅操作进行基本亚硝化,然后用硫酸二甲酯进行甲基化,可以高收率得到相应的甲基醚。衍生自3-甲氧基苯酚和8-羟基喹啉的两种对醌单肟对HSV-1具有中等活性,后一种肟对HSV-2也有效。另一方面,对苯二酚单肟衍生自水杨酸甲酯,1-萘酚,