Jl. Renaud et al., SYNTHETIC USEFULNESS OF THE COBALT(I)-MEDIATED ENE TYPE REACTION FOR THE DIASTEREOSELECTIVE CONSTRUCTION OF BICYCLO[N.3.0]DERIVATIVES, Synlett, (8), 1997, pp. 931
Cobalt(I)-catalyzed cycloisomerization of cyclic epsilon-acetylenic be
ta-ketoesters 1 led to bicyclo[n.3,0]derivatives 2 in high yield and w
ith a total stereocontrol of two contiguous centers.