Bismuth(III) Chloride: An Efficient Catalyst for the One-Pot Stereoselective Synthesis of Octahydroacridines
作者:Gowravaram Sabitha、Erigala Venkata Reddy、Jhillu S. Yadav
DOI:10.1055/s-2002-20045
日期:——
A one-pot procedure for the stereocontrolled preparation of octahydroacridine derivatives is reported, which involves the intramolecular hetero-Diels-Alder reaction of N-arylimines produced in situ from citronellal and aromatic amines. The temperature of the reaction medium plays a key role in determination of the trans/cis ratio.
2-Azadienes derived in situ from arylamines and (R)-(+)-citronellal/3-methylcitronellal undergo intramolecular [4+2] hetero-Diels–Alder reactions in the air and moisture stable ionic liquid [bmim]BF4 in the absence of any acid catalyst to afford 1,2,3,4,4a,9,9a,10-octahydroacridine derivatives in high to quantitative yields.
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.