Page 1. Tetrahedron Letters,Vol.28,No.24,pp 2767-2768,1987 oo40-4039/87 $3.00 + .OO ... References and notes 1. C. Walsh, Tetrahedron, 38 (1982) 871 2. RB Silverman and PA Zieske, Biochemistry, 24 (1985) 2128 3. P. Lindbarg, R. Bergman and B. Wickberg, J. Chem. Sot. ...