Synthesis of 2,3-Dialkoxy-1H-pyrrole via Reduction of Dioxopyrroline with Sodium Hydrosulfite
摘要:
Reduction of IH-pyrrole-2,3-dione (3 and 7) with sodium hydrosulfite took place selectively in a 1,4-manner. Methylation of the product with diazomethane gave 1,5-dihydro-3-methoxy-2H-pyrrol-2-one (5 and 8) in good yield. Treatment of the methyl ether (5 or 8) with triethyloxonium tetrafluoroborate caused ethylation of the lactam carbonyl with concomitant deprotonation to give 2,3-dialkoxy-1H-pyrrole (9). This conversion provides a simple synthetic method of 2,3-dialkoxypyrroles.
ylate and 5-aryl-2,4-dioxopyrrolidine-3-carboxylate derivatives were successfully synthesized via carbonyl-based multiple component reaction and Dieckmann cyclization, respectively. Successive functional group transformations which include decarboxylation and hydrazonation afforded 2-oxo-5-aryl-3-hydrazone and 2-oxo-5-aryl-4hydrazone derivatives. Compound 3d exhibited activity against human histiocytic
Synthesis of 2,3-Dioxo-5-(substituted)arylpyrroles and Their 2-Oxo-5-aryl-3-hydrazone Pyrrolidine Derivatives
作者:M. Mohammat、Z. Shaameri、A. Hamzah
DOI:10.3390/molecules14010250
日期:——
Some novel 2,3-dioxo-5-(substituted)-arylpyrroles have been synthesized. Among these, pyrrolidine compound 1b was converted to 2,3-dioxo-5-aryl pyrrolidine 2b. Finally a set of hydrazone derivatives was obtained from the reaction of 2b with various hydrazine salts. The structures of all the new synthesized compounds were confirmed by elemental analyses, IR and 1H-NMR spectra.
Synthesis of 5-aryl-2-oxopyrrole derivatives as synthons for highly substituted pyrroles
作者:Bert Metten、Maarten Kostermans、Gitte Van Baelen、Mario Smet、Wim Dehaen
DOI:10.1016/j.tet.2006.04.005
日期:2006.6
A small library of 2-oxo-5-(hetero)arylpyrroles was prepared starting from 2,3-dioxo-5-(hetero)arylpyrrolidines. The large synthetic possibilities of these 2-oxopyrroles were investigated. The 2-oxopyrroles offer a large number of possible derivatizations including reactions with electrophiles. The chloroformylation of 2-oxo-5-(hetero)arylpyrroles provides pyrrole carbaldehydes. Some pyrrole carbaldehydes were used to synthesize polycyclic compounds like pyrrolo[3,4-d]pyridazinones, a thienopyrrole, apyrrolobenz[1,4]oxazepine, a pyrrolobenzo[1,4]thiazepine, and a pyrrolobenzo[1,4]diazepine. Hereby we showed through a short exploration that the oxopyrroles and analogues are interesting and versatile synthetic building blocks. (c) 2006 Elsevier Ltd. All rights reserved.