References
- Narasimhan , N. S. and Mali , R. S. 1983 . Synthesis , : 957
- Vyas , G. N. and Shah , N. M. 1963 . Org.Synth.Coll. , IV : 836
- Thames , S. F. and Homer , C. O. 1966 . J.Heterocyclic Chem. , 3 : 490
- Napolitano , E. , Giannone , E. , Fiaschi , R. and Marsili , A. 1983 . J.Org.Chem. , 48 : 3653
- Compounds 4a-d, 5a-d and 7a-d gave satisfactory elemental analyses.
- Corey , E. J. and Suggs , J. W. 1975 . Tetrahedron Lett. , 31 : 2647
- Compounds 9a-d were prepared by addition of n-butyllithium (1.6 M in hexane,l.l eq) to a cooled (-789C) solution of furan, 2-ethylfuran bromobenzene or thiophene, respectively, in dry diethylether(10 mL).In the cases of 9a,9b. and 9d, the mixture was allowed to warming to room temperature and, after 1h., again cooled to -78[ddot]C.