... Synthesis of 3,4- Dihydro-S-hydroxycarhostyril, 1,2,3,4-Tetrahydro—5-hydroxy-2-ox0-1,7— naphthyridine, and Methyl 3-Methoxypyridine-4—carboxy1ate YASUMITSU T AMURA ... 5) A facile preparation of 5 has been established: Y. Tamura, M. Fujita, LC Chen, H. Kiyokawa ...