Antivertigo agents. III. Synthesis of 5,6,7,8-tetrahydro-1,6-naphthyridine methyl homologs.
作者:AKIRA SHIOZAWA、YUHICHIRO ICHIKAWA、CHIKARA KOMURO、SHUJI KURASHIGE、HIROSHI MIYAZAKI、HIROSHI YAMANAKA、TAKAO SAKAMOTO
DOI:10.1248/cpb.32.2522
日期:——
5-Methyl-(4a), 7-methyl-(4b), and 8-methyl-5, 6, 7, 8-tetrahydro-1, 6-naphthyridine (4c) were synthesized by chemical modification of pyridine derivatives. On the other hand, the synthesis of the compounds (20b, c) having a methyl group in the aromatic ring of 5, 6, 7, 8-tetrahydro-1, 6-naphthyridine was accomplished by the condensation of 1-benzyl-4-piperidinone with the corresponding 3-amino-enones followed by debenzylation. The pathway of the condensation is briefly discussed.
5-甲基-(4a)、7-甲基-(4b)和8-甲基-5, 6, 7, 8-四氢-1, 6-萘啶 (4c) 通过对吡啶衍生物的化学修饰合成而成。另一方面,通过将1-苄基-4-哌啶酮与相应的3-氨基-烯酮缩合后去苄基化,合成了具有5, 6, 7, 8-四氢-1, 6-萘啶芳环中甲基取代基的化合物(20b, c)。缩合反应的路径进行了简要讨论。