REFERENCES
- Earl , J.C. and Mackay , A.W. 1935 . J. Chem. Soc. , : 899
- Stewart , F.H.C. 1964 . Chem. Rev. , 64 : 129
- Preston , P.N. and Turnbull , K.J. 1977 . Chem. Soc. Perkin Trans. 1 , : 1229
- Chan , W.L. , Waite , J.A. and Lin , Y.H. 1994 . Heterocycles , 38 ( 9 ) : 2023
- Turnbull , K. and Krein , D.M. 1997 . Tetrahedron Lett. , 38 ( 7 ) : 1165
- Burson , W.C. , Jones , D.R. , Turnbull , K. and Preston , P.N. 1991 . Synthesis , : 745
- Zhang , Z.B. , Wu , Y.R. and Yin , C.L. 1994 . J. of Beijing Normal University, Natural Science Edition , 30 ( 2 ) : 232
- Zhang , Z.B. , Wu , Y.R. and Yin , C.L. 1997 . J. of Beijing Normal University, Natural Science Edition , 33 ( 4 ) : 521