Ring-Expansion Reaction of Cyclic β-Keto Esters or α-Cyano Ketones via Conjugate Addition to Alkynyl Imines: The Synthesis of Functionalized Medium-Sized Carbocycles - Hachiya, Iwao; Maehara, Wataru; Yamada, Yasushi; Kamiki, Toru; Shimizu, Makoto (Synlett, 2006)