T. Okatani

The effects of solvent and temperature on the orientation of cycloaddition reaction of 1,2,3-triazine with enamines: its application to the synthesis of alkaloids. onychine and 6-methoxyonychine

J. Koyama, K. Tagahara, T. Okatani, 1988 .

Synthesis of Alkaloids, Cleistopholine, Oxylopine (Isoursuline), and Ursuline

H. Irie, J. Koyama, K. Tagahara, 1989 .

Modified synthesis of monocyclic 1,2,3-triazine and cycloaddition reaction with enamine: the application to the synthesis of alkaloids, tortuosamine, N-formyltortuosamine and N-acetyltortuosamine

J. Koyama, K. Tagahara, T. Okatani, 1989 .

Synthesis of (-)-patchoulipyridine and related compounds

H. Irie, J. Koyama, K. Tagahara, 1991 .

Synthesis of sesquiterpene alkaloids guaipyridine epiguaipyridine and related compounds

J. Koyama, K. Tagahara, T. Okatani, 1987 .

Anthraquinones of Damnacanthus indicus

Isao Kouno, J. Koyama, K. Tagahara, 1992 .