1. 1,3-Dipolar cycloaddition of nitrile oxides with 1,4-dihydropyridines and conformational analysis of isoxazolo[5,4-b]pyridines
2. N. Tsuda, T. Mishina, M. Obata, K. Araki, A. Inui, and T. Nakamura, Yoshitomi Pharmaceutical Industries, Ltd, Japan Patent 61,227,854 (1986);
3. Chem. Abstr., 106, 176416m (1987) and
4. Japan Patent 63,101,383 (1988);
5. Chem. Abstr., 109, 128988g (1989).