A novel and efficient method for the synthesis of α-cyanomethyl-β-dicarbonyls in moderate to excellent yields is developed by using inactive CH3CN and simple 1,3-dicarbonyls. A radical mechanism is proposed under the ESI-MS (electrospray ionization mass spectrometry) analysis results of control experiments.
New approaches to polysubstituted pyrroles and pyrrolinones from α-cyanomethyl-β-ketoesters
作者:Ayhan S. Demir、Mustafa Emrullahoglu、Gülben Ardahan
DOI:10.1016/j.tet.2006.10.054
日期:2007.1
efficient, regioselective one-pot synthesis of 5-alkoxy and 5-alkylsulfanylpyrrole-3-carboxylates in high yields via the zinc perchlorate-catalyzed addition of alcohols and thiols to the nitrile carbon of α-cyanomethyl-β-ketoesters followed by annulation. The addition–annulation process is undertaken in aqueous solution to give 4,5-dihydro-5-oxo-1H-pyrrole-3-carboxylates (pyrrolinones) in good yields. These
Zinc perchlorate catalyzed one-pot amination–annulation of α-cyanomethyl-β-ketoesters in water. Regioselective synthesis of 2-aminopyrrole-4-carboxylates
作者:Ayhan S. Demir、Mustafa Emrullahoglu
DOI:10.1016/j.tet.2005.11.018
日期:2006.2
In this paper, we report the efficient and regioselective synthesis of 2-aminopyrrole-4-carboxylates as derivatives of conformationally restricted analogues of gamma-amino butyrates (GABA) via a zinc perchlorate catalyzed amination-annulation of alpha-cyanomethyl-beta-ketoesters under mild reaction conditions in water. (c) 2005 Elsevier Ltd. All rights reserved.
An effective new synthesis of 2-aminopyrrole-4-carboxylates
作者:Ayhan S. Demir、Mustafa Emrullahoglu
DOI:10.1016/j.tet.2005.08.050
日期:2005.10
α-cyanomethyl-β-dicarbonyl compounds with amines catalyzed by p-TsOH affords the corresponding enamines in good yields. Base catalyzed cyclization via the addition of an amine moiety to the carbon–nitrogentriplebond of nitrile furnished 2-aminopyrroles in high yields.