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chunling0102

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[求助] 3-醛基-4-溴吡啶或3-醛基-4-氯吡啶的合成

有哪位大哥大姐做过3-醛基-4-溴吡啶或3-醛基-4-氯吡啶, 原料用4-溴吡啶或4-氯吡啶盐酸盐。我想要具体的操作过程和后处理过程,及收率

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kevin1991

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【答案】应助回帖

https://www.google.com.hk/patent ... NG+3-PYRIDYL+GROUPS,+PROCESS+FOR+PREPARING+THE+SAME+AND+USE+THEREOF&hl=zh-CN&sa=X&ei=dWlaUcqGFoPhlAW694DIAg&ved=0CEIQ6AEwAw
3楼2013-04-02 13:17:07
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kevin1991

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chunling0102: 金币+6, 博学EPI+1 2013-04-03 20:28:57
参考文献:Patent:SUBSTITUTED THIAZOLE DERIVATIVES BEARING 3-PYRIDYL GROUPS, PROCESS FOR PREPARING THE SAME AND USE THEREOF ( EP1348706 A1, 2003)可在google patent上下载
A solution (50 ml) of 4-chloropyridine (25.0 g, 0.22 mol) in tetrahydrofuran was added dropwise to a tetrahydrofuran solution (300 ml) of lithium diisopropylamide prepared from a solution (179 ml, 0.29 mol) of 1.6 M n-butyllithium in hexane and diisopropylamine (33.4 g, 0.33 mol) under an argon atmosphere at -78 DEG C. After stirring for 30 min., DMF (19.3 g, 0.26 mol) was added and the mixture was gradually heated to room temperature. The reaction mixture was extracted with ethyl acetate (200 ml) - 5percent NH4Cl aq. (300 ml). The organic layer was dried (MgSO4) and the solvent was evaporated under reduced pressure to give a crude title compound (27 g, 86percent) as an oil.<1>H-NMR (200Hz, CDCl3) delta : 7.45 (1H, d, J = 5.0 Hz), 8.69 (1H, d, J = 5.0Hz), 9.05 (1H, s), 10.51 (1H, S).
2楼2013-04-02 13:15:14
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