Chemical synthesis and biological activities of 5-deazaaminopterin analogs bearing substituent(s) at the 5- and/or 7-position(s)
作者:Tsann Long Su、Jai Tung Huang、Ting Chao Chou、Glenys M. Otter、Francis M. Sirotnak、Kyoichi A. Watanabe
DOI:10.1021/jm00401a023
日期:1988.6
Condensation of cyanothioacetamide (4) with ethyl alpha-(ethoxymethylene)acetoacetate (5b), ethyl 4-ethoxy-2-(ethoxymethylene)-3-oxobutanoate (5c), ethyl 2-(ethoxymethylene)-3-oxo-4-phenylpropanoate (5d) afforded exclusively the corresponding 6-substituted pyridines (6b-d). Cyclization of 4 with 3-carbethoxybutane-2,4-dione (5e) gave 3-cyano-5-(ethoxycarbonyl)-4,6-dimethylpyridine-2(1H)-thione (6e)
氰基硫代乙酰胺(4)与α-(乙氧基亚甲基)乙酰乙酸乙酯(5b),4-乙氧基-2-(乙氧基亚甲基)-3-氧代丁酸乙酯(5c),2-(乙氧基亚甲基)-3-氧代-4-苯基丙酸乙酯的缩合(5d)仅提供相应的6-取代的吡啶(6b-d)。用3-乙氧基丁烷-2,4-二酮(5e)环化4,得到3-氰基-5-(乙氧基羰基)-4,6-二甲基吡啶-2(1H)-硫酮(6e),而4与3-的反应carbethoxy-1-phenylpropane-1,3-dione(5f)产生两种产物,3-cyano-5-(ethoxy羰基)-4-methyl-6-phenylpyridine-2(1H)-thione(6f)和6-methyl -4-苯基异构体6g。6f和6g的结构分配是基于对6f和6g通过MeI / K2CO3处理制备的2-(甲硫基)烟酸酯(7f,g)的1H和13C NMR光谱分析得出的。烟酸酯7b,dg转化为其相应的2,4-二氨基吡啶并[2