作者:Jian-Long Chen、Wolfgang Steglich
DOI:10.1002/jhet.5570300411
日期:1993.7
The new benzofuro[2,3-b]naphthyridine ring system was prepared. 2,4-Dichloro-3-(o-methoxyphenyl)naphthyridines 3a and 3b were obtained by chlorination of hydroxynaphthyridinones 2a and 2b. Demethylation followed by cyclization of 3a and 3b afforded 11-chlorobenzofuro[2,3-b]naphthyridines 4a and 4b. Hydrogenolysis of these 11-chlorobenzofuronaphthyridines gave the parent benzofuro[2,3-b]naphthyridines
制备了新的苯并呋喃[2,3- b ]萘啶环系统。通过氯化羟基萘啶酮2a和2b获得2,4-二氯-3-(邻甲氧基苯基)萘啶3a和3b。脱甲基,然后环化3a和3b,得到11-氯苯并呋喃[2,3- b ]萘啶4a和4b。这些11-氯苯并呋喃核苷的氢解产生母体苯并呋喃[2,3- b ]萘啶5a和5b。模拟4b也将其转化为11-甲氧基苯并呋喃[2,3- b ] [1,8]萘啶(6)。