Carbonyl coupling reaction employing low-valent titanium1 is a valuable method for preparing sterically hindered olefins.2-4 Recently, McMurry and Krepski5 have demonstrated further that the method is equally effective for cross-couplings between aryl ketones and aliphatic carbonyl compounds. We investigated the cross-couplings between dicyclopropyl ketone
Cocyclization of diyne (I) (prepared via silylation of bis‐2‐propynyl ether) with MeCN (II) in the presence of Co complex (III) yields the pyridine derivative (IV) which on purification affords (V).
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