References
- Nagarathnam , D. , Vedachalam , M. and Srinivasan , P. C. 1983 . Synthesis , 156
- Poissonnet , G. , Potier , P. and Dodd , R. H. 1989 . Tetrahedron Lett. , 30 : 3423
- Pelcman , B. and Gribble , G. N. 1990 . Tetrahedron Lett. , 31 : 2381
- Narayanan , K. and Cook , J. M. 1990 . Heterocycles , 31 : 203
- Elango , S. and Srinivasan , P. C. 1993 . Tetrahedron Lett , 34 : 1347
- Black , D. C. , Keller , P. A. and Kumar , Naresh . 1993 . Tetrahedron , 49 : 151