第 40 卷第 5 期 |  | Vol. 40 No. 5 | 2010 年 10 月 | Oct 2010 |
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所屬欄目:醫藥及中間體
5,6,7,8-四氫吡啶并[3,4-b]吡嗪的合成 |
劉凌鈞
(西南石油大學(xué) 化學(xué)與化工學(xué)院,四川 成都 610500) |
摘 要:3,4-二氨基吡啶與乙二醛環(huán)化得到吡啶并[3,4-b]吡嗪,進(jìn)一步與氯甲酸乙酯在硼氫化鋰的作用下發(fā)生還原反應得到乙基5,6-二氫吡啶并[3,4-b]吡嗪-6(5H)-羧酸酯,然后經(jīng)鈀碳氫化得到乙基-5,6,7,8-四氫-二氫吡啶并[3,4-b]吡嗪-6(5H)-羧酸酯,最后在堿性條件下去保護基團合成了5,6,7,8-四氫吡啶并[3,4-b]吡嗪。對還原反應進(jìn)行了工藝研究,確定優(yōu)化反應條件:硼氫化鋰為還原劑,反應時(shí)間為1 h,反應溫度為-15℃?偸章蕿48.4%。產(chǎn)品結構經(jīng)1H NMR確證。 |
關(guān)鍵詞:5,6,7,8-四氫吡啶并[3,4-b]吡嗪;3,4-二氨基吡啶;硼氫化鋰 |
中圖分類(lèi)號:R914 文獻標識碼:A 文章編號: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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作者簡(jiǎn)介:劉凌鈞(1983- ),男,山東棗莊人,碩士研究生,主要從事有機合成研究。(E-mail:lingjun966@126.com)
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收稿日期:2010-03-31
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