Ionic liquid accelerated intramolecular hetero-Diels–Alder reactions: a protocol for the synthesis of octahydroacridines
作者:J.S. Yadav、B.V.S. Reddy、Lakshindra Chetia、G. Srinivasulu、A.C. Kunwar
DOI:10.1016/j.tetlet.2004.11.137
日期:2005.2
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.
原位衍生自芳基胺和(R)-(+)-香茅醛/ 3-甲基香茅醛的2-氮杂二烯在空气中和湿气稳定的离子液体[bmim] BF 4中发生分子内[4 + 2]杂Diels-Alder反应。不存在任何酸催化剂,以高到定量的产率得到1,2,3,4,4a,9,9a,10-八氢ac啶衍生物。