A one-pot synthesis of thiophene and pyrrole derivatives from readily accessible 3,5-dihydro-1,2-dioxines
作者:Cassie E Hewton、Marc C Kimber、Dennis K Taylor
DOI:10.1016/s0040-4039(02)00503-8
日期:2002.4
A one-pot synthesis of 2,5-disubstituted thiophene, 1,2,5-tri- and 2,5-disubstituted pyrrolederivativesfrom readily available 3,5-dihydro-1,2-dioxines is described. The reaction proceeds by an initial Kornblum–de la Mare rearrangement of the 3,5-dihydro-1,2-dioxine to its isomeric 1,4-diketone followed by condensation of the in situ 1,4-diketone with sulfur, ammonia or a primary amine.
描述了从容易获得的3,5-二氢-1,2-二恶英一锅合成2,5-二取代的噻吩,1,2,5-三-和2,5-二取代的吡咯衍生物。通过3,5-二氢-1,2-二恶英的Kornblum-de la Mare初始重排为其异构体1,4-二酮,然后将原位1,4-二酮与硫,氨或伯胺。
One-pot synthesis of pyrrole derivatives from (E)-1,4-diaryl-2-butene-1,4-diones
作者:H Surya Prakash Rao、S Jothilingam
DOI:10.1016/s0040-4039(01)01334-x
日期:2001.9
2,5-Di- and 1,2,5-trisubstituted pyrrolederivatives can be prepared conveniently from (E)-1,4-diaryl-2-butene-1,4-diones in a one-pot operation through domino-pathways via palladium-assisted transfer hydrogenation followed by a Paal–Knorr reaction using ammonium formate and its analogs.
A NOVEL PHOTOREARRANGEMENT OF 2,5-DIARYL-1,4-DITHIIN-1,1-DIOXIDE ACCOMPANIED BY EXTRUSION OF SULFUR DIOXIDE
作者:Keiji Kobayashi、Kiyoshi Mutai
DOI:10.1246/cl.1983.1461
日期:1983.9.5
Photolysis of the title compound afforded 2,5-diarylthiophene. The mechanism involving the valence isomerization to thioketone was supported by the photolysis in n-butylamine, which gave pyrrole derivatives.
Microwave mediated facile one-pot synthesis of polyarylpyrroles from but-2-ene- and but-2-yne-1,4-diones
作者:H.Surya Prakash Rao、S Jothilingam、Hans W Scheeren
DOI:10.1016/j.tet.2003.11.087
日期:2004.2
Several pyrrole derivates with multiple aryl substituents were prepared conveniently in a one pot-reaction from but-2-ene-1,4-diones and but-2-yne-1,4-diones via hydrogenation of the carbon-carbon double bond/triple bond followed by amination-cyclization. The reaction could be performed with ammonium formate or alkyl/arylammonium formates under Pd/C in polyethylene glycol-200 (PEG-200) under microwave irradiation. Using this procedure, different aryl-substituted pyrroles were prepared. Furthermore, studies on microwave vs thermal conditions indicate faster heating under microwave conditions was responsible for rate enhancement. (C) 2003 Elsevier Ltd. All rights reserved.