【药物名称】Coluracetam, MKC-231
化学结构式(Chemical Structure):
参考文献No.14813
标题:4-Acylaminopyridine derivs.
作者:Ninomiya, K.; Saito, K.; Sugano, M.; Tobe, A.; Morinaka, Y.; Bessho, T.; Harada, H. (Mitsubishi Chemical Corp.)
来源:EP 0427636; JP 1991151366; JP 1991218360; JP 1991218361; US 5397785; US 5536728; US 5861411
合成路线图解说明:

The intermediate 2,3-dimethyl-5,6,7,8-tetrahydrofuro[2,3-b]quinolin-4-amine (IV) has been obtained by two different ways: The cyclization of the bicyclic isatin (I) with cyclohexanone, NH4OH and NH4OAc in methanol gives 2,3-dimethyl-5,6,7,8-tetrahydrofuro[2,3-b]quinolin-4-carboxamide (III), which is submitted to a Hofmann rearrangement by means of Br2 and NaOH in water to yield the intermediate amine (IV). The cyclization of 2-amino-4,5-dimethylfuran-3-carbonitrile (V) with cyclohexanone (II) by means of ZnCl2 in hot xylene or nitrobenzene gives directly the intermediate amine (IV). Finally, amine (IV) is condensed with 2-(2-oxopyrrolidin-1-yl)acetic acid methyl ester (VI) by means of NaH in NMP to provide the target amide.

参考文献No.320384
标题:Design and syntheses of 4-acylaminopyridine derivatives: Novel high affinity choline uptake enhancers II
作者:Chaki, H.; et al.
来源:Bioorg Med Chem Lett 1995,5(14),1495
合成路线图解说明:

The intermediate 2,3-dimethyl-5,6,7,8-tetrahydrofuro[2,3-b]quinolin-4-amine (IV) has been obtained by two different ways: The cyclization of the bicyclic isatin (I) with cyclohexanone, NH4OH and NH4OAc in methanol gives 2,3-dimethyl-5,6,7,8-tetrahydrofuro[2,3-b]quinolin-4-carboxamide (III), which is submitted to a Hofmann rearrangement by means of Br2 and NaOH in water to yield the intermediate amine (IV). The cyclization of 2-amino-4,5-dimethylfuran-3-carbonitrile (V) with cyclohexanone (II) by means of ZnCl2 in hot xylene or nitrobenzene gives directly the intermediate amine (IV). Finally, amine (IV) is condensed with 2-(2-oxopyrrolidin-1-yl)acetic acid methyl ester (VI) by means of NaH in NMP to provide the target amide.

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