P. Cruciani et al., STUDIES ON DIASTEREOSELECTIVITY OF THE COBALT(I) CATALYZED CYCLOISOMERIZATION OF SUBSTITUTED EPSILON-ACETYLENIC BETA-KETOESTER, Tetrahedron letters, 35(36), 1994, pp. 6677-6680
Cobalt (I) catalyzed cycloisomerization of a epsilon-acetylenic beta'-
alkyl beta-ketoester led to highly functionalized methylenecyclopentan
es with stereocontrol of two contiguous centers. The level of diastere
oselectivity is moderate to high (de = 12.92%).