Studies on ketene and its derivatives. CX. Synthesis of 1,3-dimethoxyfluoren-9-ones.
作者:JUN NAKANO、NOBUYA KATAGIRI、TETSUZO KATO
DOI:10.1248/cpb.30.2590
日期:——
The synthesis of 1, 3-dimethoxyfluoren-9-ones (7a-f) from ethyl 2-aryl-4, 6-dihydroxybenzoates (4a-d), prepared by the reaction of diketene with ethyl 3-aryl-3-oxopropionates (3a-d), is described. Reaction of diketene with 3a-d in the presence of sodium hydride in tetrahydrofuran gave 4a-d. Methylation of 4a-d with methyl iodide, followed by treatment with alcoholic sodium hydroxide, gave 2-aryl-4, 6-dimethoxybenzoic acids (6a-d). Cyclization of 6a-d with trifluoroacetic anhydride gave 7a-f.
本文介绍了由 2-芳基-4,6-二羟基苯甲酸乙酯(4a-d)合成 1,3-二甲氧基芴-9-酮(7a-f)的方法,该方法由二酮烯与 3-芳基-3-氧代丙酸乙酯(3a-d)反应制备。在氢化钠存在下,二酮烯与 3a-d 在四氢呋喃中反应,得到 4a-d。4a-d 与碘甲烷甲基化,然后用氢氧化钠醇处理,得到 2-芳基-4,6-二甲氧基苯甲酸(6a-d)。用三氟乙酸酐将 6a-d 环化,得到 7a-f。