Transformations of enaminones. A simple one-pot synthesis of imidazolone derivatives
Transformations of enaminones. A simple one-pot synthesis of imidazolone derivatives
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DOI:
10.1016/j.tet.2011.11.013
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发表时间:
2012-01-14
期刊:
影响因子:
2.1
通讯作者:
Stanovnik, Branko
中科院分区:
文献类型:
--
作者:
Bezensek, Jure;Groselj, Uros;Stanovnik, Branko
Ethyl (5-benzoyl-2-oxo-3-substituted-2.3-dihydro-1H-imidazol-1-yl)carbamates 7 were prepared by the Michael addition of diethyl azodicarboxylate (3) to (E)-3-(dimethylamino)-1-phenylprop-2-en-1-one (2) followed by substitution of the dimethylamino group with primary amines 5a-n to afford a mixture of (E) and (Z) diethyl 1-(1-(substituted)amino)-3-oxo-3-phenylprop-1-en-2-yl)hydrazine-1,2-dicarboxylates (6a-n), followed by cyclization to give final products 7a-n. The intermediate 6i was isolated and characterized and transformed into 7i. All imidazolones 7a-n were synthesized in one pot reaction sequences with individual reactions being very clean. (C) 2011 Elsevier Ltd. All rights reserved.