Novel Synthesis of Bicycles with Fused Pyrrole, Indole, Oxazole, and Imidazole Rings
作者:Alan R. Katritzky、Sanjay K. Singh、Sergey Bobrov
DOI:10.1021/jo0485334
日期:2004.12.1
Reactions of benzotriazol-1-yl(1H-pyrrol-2-yl)methanone 10 and benzotriazol-1-yl(1H-indol-2-yl)methanone 11 with diverse ketones, isocyanates, and isothiocyanates in the presence of base afforded pyrrolo[1,2-c]oxazol-1-ones 1, oxazolo[3,4-a]indol-1-ones 2, pyrrolo[1,2-c]imidazoles 3, and imidazo[1,5-a]indoles 4 by a simple one-step procedure.
在碱存在下,苯并三唑-1-基(1 H-吡咯-2-基)甲酮10和苯并三唑-1-基(1 H-吲哚-2-基)甲酮11在碱的存在下与各种酮,异氰酸酯和异硫氰酸酯的反应得到吡咯并[1,2 - c ]恶唑-1-酮1,恶唑并[3,4- a ]吲哚-1-酮2,吡咯并[1,2- c ]咪唑3和咪唑并[1,5- a通过简单的一步操作即可吲哚4。
Highly Efficient Dehydrogenation of 5-Benzyl-3-phenyl-2-thioxoimidazolidin-4-one: Microwave versus Flash Vacuum Pyrolysis Conditions
作者:Ana J. Pepino、Walter J. Peláez、Elizabeth L. Moyano、Gustavo A. Argüello
DOI:10.1002/ejoc.201200257
日期:2012.6
5-Benzyl-3-phenyl-2-thioxoimidazolidin-4-one underwent thermal dehydrogenation to afford 5-benzylidene-2-thioxoimidaxolidin-4-one under microwave and flashvacuumpyrolysisconditions. A high predominance of the Z-isomer over the E-isomer of the imidazolidinone product was achieved. By using DFT and NBO calculations, the mechanism of the dehydrogenation and the selectivity were also explored.