Novel synthetic route for 5-substituted 6-arylmethylluracils from 2,4,6-trichloropyrimidines
作者:Yasser M. Loksha
DOI:10.1002/jhet.239
日期:2009.11
synthesized by bromination of 6‐arylmethylluracils (5a, 5b, 5c, 5d) with N‐bromosuccinimide (NBS). Refluxing 2‐(2,6‐dichloro‐5‐ethylpyrimidin‐4‐yl)‐2‐(3,5‐dimethylphenyl)acetonitrile (3f) with sodium methoxide followed by oxidation afforded (3,5‐dimethylphenyl)(5‐ethyl‐2,6‐dimethoxypyrimidin‐4‐yl)methanone (7). Addition of methylmagnesium bromide to compound 7 gave the tertiary alcohol derivative 8 which
用苄基氰化物衍生物(2a,2b)的钠盐处理2,4,6-三氯嘧啶(1a,1b),得到5-取代的4-芳基(氰基甲基)-2,6-二氯嘧啶(3a,3b,3c,3d,3e,3f)。用碘甲烷将化合物3a,3b烷基化,得到4-(1-芳基-1-氰基乙基)-2,6-二氯嘧啶(4a,4b)。化合物3a,3b,3c,3d,3e,将3f和4a,4b用浓盐酸水解,得到5-取代的6-芳基烷基尿嘧啶5a,5b,5c,5d,5e,5f,5g,5h。通过用N溴化6-芳基甲基尿嘧啶(5a,5b,5c,5d)合成了5-溴-6-芳甲基尿嘧啶(6a,6b,6c,6d)溴代琥珀酰亚胺(NBS)。用甲醇钠将2-(2,6-二氯-5-乙基嘧啶-4-基)-2-(3,5-二甲基苯基)乙腈(3f)回流,然后氧化得到(3,5-二甲基苯基)(5-乙基-2,6-二甲氧基嘧啶-4-基)甲酮(7)。在化合物7中添加甲基溴化镁后得到叔醇衍生物8,该叔醇衍生