Synthesis of analogs of amrinone: 4-(3,4-Disubstitutedphenyl)pyridines and derivatives thereof
作者:Baldev Singh、George Y. Lesher
DOI:10.1002/jhet.5570280416
日期:1991.6
4-(3,4-Dimethoxyphenyl)pyridine (5c) prepared by the coupling of 3,4-dimethoxyphenyldiazonium chloride with pyridine was converted to 4-(4-pyridinyl)benzene-1,2-diol (6c) by treating with hydrobromic acid. Diazotization of 4-(4-pyridinyl)benzeneamine (7) and 3-(4-pyridinyl)benzeneamine (12) gave the corresponding phenols 8 and 13 which were nitrated to give 2-nitro-4-(4-pyridinyl)phenol (9) and 2-
通过将3,4-二甲氧基苯基重氮氯化物与吡啶偶联制备的4-(3,4-二甲氧基苯基)吡啶(5c)通过氢溴酸处理转化为4-(4-吡啶基)苯-1,2-二醇(6c)酸。4-(4-吡啶基)苯胺(7)和3-(4-吡啶基)苯胺(12)重氮化,得到相应的酚8和13,将其硝化得到2-硝基-4-(4-吡啶基)苯酚(7)。9)和2-硝基-5-(4-吡啶基)-苯酚(14)。还原这些硝基苯酚得到相应的氨基苯酚10和16,它们再与N,N'反应-羰基二咪唑分别生成苯并恶唑酮11和17。催化还原2-硝基-4-(4-吡啶基)苯胺(18),得到4-(4-吡啶基)苯-1,2-二胺(19),使其与原酸酯,尿素,四乙氧基甲烷和N,N反应-二(羰甲氧基)甲基伪硫脲,得到相应的苯并咪唑衍生物20、21、22和23。