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delta-Valerolactam is the starting material for a new route to hexahydrojulolidines, using intramolecular 1,4-cycloaddition. It is used as an intermediate in the preparation of other chemicals.
Naoki Toyooka; Yasuko Yoshida; Yasuhito Yotsui and Takefumi Momose. 2-Piperidone Type of Chiral Building Block for 3-Piperidinol Alkaloid Synthesis. J. Org. Chem. 1999, 64 (13), 4914-4919.
Tetsuji Kametani; Terumi Higa; Masuo Koizumi; Masataka Ihara; Keiichiro Fukumoto. Iminoketene cycloaddition. 2. Total syntheses of arborine, glycosminine, and rutecarpine by condensation of iminoketene with amides. J. Am. Chem. Soc. 1977, 99 (7), 2306-2309.
Starting material for a new route to hexahydrojulolidines, using intramolecular 1,4-cycloaddition: J. Org. Chem., 58, 5041 (1993).
For reaction as a heterodienophile in cycloaddition with Danishefsky's diene, see: Tris(6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedionato)europium(III), 33541.