Furan Derivatives. IV. On the Effects of Substituents in the Syntheses of 4,5-Dihydro-3<i>H</i>-naphtho[1,8-<i>bc</i>]furans
作者:Sakaaki Horaguchi、Mamoru Hara、Tsuneo Suzuki
DOI:10.1246/bcsj.55.865
日期:1982.3
The reaction of (8-oxo-5,6,7,8-tetrahydro-1-naphthyloxy)acetic acids with acetic anhydride and sodium acetate give a mixture of 4,5-dihydro-3H-naphtho[1,8-bc]furans and lactones. The relative yields of 4,5-dihydro-3H-naphtho[1,8-bc]furans and lactones varied according to kinds of substituents on the benzene ring of (8-oxo-5,6,7,8-tetrahydro-1-naphthyloxy)acetic acids. Substituents which make the methylene
(8-oxo-5,6,7,8-tetrahydro-1-naphthyloxy) 乙酸与乙酸酐和乙酸钠反应得到 4,5-dihydro-3H-naphtho[1,8-bc] 的混合物呋喃和内酯。4,5-二氢-3H-萘并[1,8-bc]呋喃和内酯的相对产率因(8-oxo-5,6,7,8-tetrahydro-1 -萘氧基)乙酸。通过空间效应使亚甲基更接近 (8-oxo-5,6,7,8-tetrahydro-1-naphthyloxy) 乙酸的羰基碳原子的取代基似乎有利于 4,5-dihydro -3H-萘并[1,8-bc]呋喃。另一方面,使亚甲基与羰基碳原子分离的取代基似乎有利于内酯的产生。(8-oxo-5,6,7,