by Lobo, A.M, Macedo de Abreu, P, Prabhakar, S, Godinho, L.S
Published in Tetrahedron letters (1983)

by Lobo, A.M, Macedo de Abreu, P, Prabhakar, S, Godinho, L.S, Rzepa, H.S, Sheppard, R.N
Published in Tetrahedron letters (1985)