Selenium- and tellurium-based ionic liquids and their use in the synthesis of octahydroacridines
作者:Eder J. Lenardão、Samuel R. Mendes、Patrícia C. Ferreira、Gelson Perin、Claudio C. Silveira、Raquel G. Jacob
DOI:10.1016/j.tetlet.2006.08.049
日期:2006.10
A general and easy method for the synthesis of several selenonium and telluronium salts is described. These compounds are acidic liquids at room temperature and were obtained in excellent yields. Phenyl butyl ethyl selenonium tetrafluoroborate was employed in the hetero-Diels-Alder cyclization of aryl imines derived from citronellal, affording octahydroacridines in good yields. (c) 2006 Elsevier Ltd. All rights reserved.
Intramolecular hetero-Diels-Alder reaction of N-arylimines. Applications to the synthesis of octahydroacridine derivatives
作者:Sabine Laschat、Juergen Lauterwein
DOI:10.1021/jo00062a033
日期:1993.5
A new intramolecular Lewis acid catalyzed hetero-Diels-Alder reaction of N-arylimines 5 with nonactivated olefins tethered to the 2-azadiene system was developed in order to prepare 1,2,3,4,-4a,9,9a,10-octahydroacridine derivatives 6. Both reactivity and cis/trans selectivity of 6 were mainly dependent on the substitution pattern in the 3-position of the cyclization precursor 5. The type of Lewis acid plays only a minor role in determination of the cis/trans ratio. The synthetic utility of this new cyclization was increased by performing it as a one-pot reaction (3+4-->6). Both absolute configuration and preferred conformation were assigned by detailed NMR studies.
Clean and atom-economic synthesis of octahydroacridines: application to essential oil of citronella
作者:Raquel G Jacob、Gelson Perin、Giancarlo V Botteselle、Eder J Lenardão
DOI:10.1016/s0040-4039(03)01749-0
日期:2003.9
A green and efficient method for the synthesis of octahydroacridine (OHA) has been developed by a simple one-pot hetero-Diels-Alder reaction starting from (+)-citronellal and N-arylamines in the presence of a solid supported catalyst (SiO2/ZnCl2), under MW irradiation and without any solvent. The method was used in the direct preparation of OHA from citronella oil in good yield. (C) 2003 Elsevier Ltd. All rights reserved.