STUDIES ON QUINONES. VI. ACID-CATALIZED REARRANGEMENTS IN SOME 4-ACETYL-2,3-DIHYDROBENZO[<i>b</i>] FURANS
作者:Luis Barrios、V. Manuel Ruiz、Ricardo Tapia、Jaime Valderrama、Juan C. Vega
DOI:10.1246/cl.1980.187
日期:1980.2.5
N-propenylpiperidine gave the corresponding 2,3-dihydrobenzo[b]furans, 2b and 2c, containing the acetyl group at C-4. Acid treatment of these dihydrofurans rearranged to 8-methyl- and 2-methoxy-8-methyljuglone (4a, 4b). Juglone (4c) and 2,3-dihydrojuglone (6) were obtained in fair yields from 4-acetyl-2,5-dihydroxy-2,3-dihydrobenzo[b]furan (2e).
2-乙酰基-和 5-乙酰基-2-甲氧基-1,4-苯醌(1a, 1c)与 N-丙烯基哌啶反应得到相应的 2,3-二氢苯并[b]呋喃,2b 和 2c,含有乙酰基C-4 组。这些二氢呋喃的酸处理重排为 8-甲基-和 2-甲氧基-8-甲基胡桃酮 (4a, 4b)。从 4-乙酰基-2,5-二羟基-2,3-二氢苯并[b]呋喃 (2e) 中以相当的产率获得胡桃酮 (4c) 和 2,3-二氢胡桃酮 (6)。