第 40 卷第 5 期 | | Vol. 40 No. 5 | 2010 年 10 月 | Oct 2010 |
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所属栏目:医药及中间体
5,6,7,8-四氢吡啶并[3,4-b]吡嗪的合成 |
刘凌钧
(西南石油大学 化学与化工学院,四川 成都 610500) |
摘 要:3,4-二氨基吡啶与乙二醛环化得到吡啶并[3,4-b]吡嗪,进一步与氯甲酸乙酯在硼氢化锂的作用下发生还原反应得到乙基5,6-二氢吡啶并[3,4-b]吡嗪-6(5H)-羧酸酯,然后经钯碳氢化得到乙基-5,6,7,8-四氢-二氢吡啶并[3,4-b]吡嗪-6(5H)-羧酸酯,最后在碱性条件下去保护基团合成了5,6,7,8-四氢吡啶并[3,4-b]吡嗪。对还原反应进行了工艺研究,确定优化反应条件:硼氢化锂为还原剂,反应时间为1 h,反应温度为-15℃。总收率为48.4%。产品结构经1H NMR确证。 |
关键词:5,6,7,8-四氢吡啶并[3,4-b]吡嗪;3,4-二氨基吡啶;硼氢化锂 |
中图分类号:R914 文献标识码:A 文章编号:1009-9212(2010)05-0049-03 |
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Synthesis of 5,6,7,8-Tetrahydropyrido[3,4-b]pyrazine |
LIU Ling-jun
(School of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610500,China) |
Abstract:Pyrido[3,4-b]pyrazine(1),which was synthesized from 3,4-diaminopyridine and gloxyal,was converted into ethyl-pyrido[3,4-b]pyrazine-6(5H)-carboxylate (2) in lithium borohydride catalyzed reduction process. 2 was further transformed to the title compound(4) in several reaction steps. The preparation of 2 is critical to the whole process,therefore its reaction conditions were optimized. The target compound was achieved in overall yield of 48.4% and confirmed with 1H NMR. |
Key words:5,6,7,8-tetrahydropyrido[3,4-b]pyrazine;3,4-diaminopyridine;lithium borohydride |
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作者简介:刘凌钧(1983- ),男,山东枣庄人,硕士研究生,主要从事有机合成研究。(E-mail:lingjun966@126.com)
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收稿日期:2010-03-31
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