The mixture of hydrophilic [bmim][BF4] and water has been found to be a green and safe reaction medium in the synthesis of ethyl 3-amino-1-aryl-1H-benzo[f]chromene derivatives using domestic microwave oven.
For recent special issues on green chemistry, see: Acc. Chem. Res., 2002, 35(9).
2.
(a) LiC.-J., Chem. Rev., 1993, 93, 2023; (b) S. Ribe and P. Wipf, Chem. Commun., 2001, 299; (c) U.M. Lindström, Chem. Rev., 2002, 102, 2751.
3.
(a) WeltonT., Chem. Rev., 1999, 99, 2071; (b) P. Wasserscheid and W. Keim, Angew. Chem., Int. Ed., 2000, 39, 3772; (c) J.H. Davis, Jr., and P.A. Fox, Chem. Commun., 2003, 1209.
4.
(a) DulliusJ.E.L., SusrezP.A.Z., EinloftS., de SouzaR.F., and DupontJ., Organometallics, 1998, 17, 815; (b) J. Peng, F. Shi, Y. Gu and Y. Deng, Green Chem., 2003, 5, 224; (c) J.S. Yadav, B.V.S. Reddy, Ch. Srinivas Reddy and K. Rajasekhar, J. Org. Chem., 2003, 68, 2525; (d) J.K. Park, P. Sreekanth, B.M. Kim, Adv. Synth. Catal., 2004, 346, 49; (e) D.W. Kim, D.J. Hong, J.W. Seo, H.S. Kim, H.K. Kim, C.E. Song and D.Y. Chi, J. Org. Chem., 2004, 69, 3186.
5.
LiuZ., ChenZ.-C., and ZhengQ.-G., Org. Lett., 2003, 5, 3321.
6.
DysonP.J., EllisD.J., and WeltonT., Can. J. Chem., 2001, 79, 705.
7.
(d) LidströmP., TierneyJ., WatheyB., WestmanJ., Tetrahedron, 2001, 57, 9225; (e) M. Larhed, C. Moberg and A. Hallberg, Acc. Chem. Res., 2002, 35, 717; (c) C.O. Kappe, Angew. Chem. Int. Ed., 2004, 43, 6250.
8.
(a) HoffmannJ., NüchterM., OndruschkaB., and WasserscheidP., Green Chem., 2003, 5, 296; (b) For a recent letter to discuss microwave heating of ionic liquids between N. Leadbeater and B. Ondruschka, see: Green Chem., 2003, 5, 677.
9.
(a) LeyS.V., LeachA.G., and StorerR.I., J. Chem. Soc., Perkin Trans. 1, 2001, 358; (b) N.E. Leadbeater and H.M. Torenius, J. Org. Chem., 2002, 67, 3145; (c) E. Van der Eycken, P. Appukkuttan, W. De Borggraeve, W. Dehaen, D. Dallinger and C.O. Kappe, J. Org. Chem., 2002, 67, 7904.
10.
MayoK.G., NearhoofE.H., and KiddleJ.J., Org. Lett., 2002, 4, 1567.
11.
VallinK.S.A., EmilssonP., LarhedM., and HallbergA., J. Org. Chem., 2002, 67, 6243.
