Manganese(III)-mediated intermolecular cyclization reactions of alkenes and active methylene compounds
作者:Jie Ouyang、Hiroshi Nishino、Kazu Kurosawa
DOI:10.1002/jhet.5570340114
日期:1997.1
The reactions of 1,1-diphenylethene, 1,1-bis(4-chlorophenyl)ethene, 1,1-bis(4-methylphenyl)ethene, and 1,1-bis(4-methoxyphenyl)ethene with 3,5-diacetyl-2,6-heptanedione in the presence of manganese(III) acetate in acetic acid at 80° yielded 4,6-diacetyl-8,8-diaryl-1,3-dimethyl-2,9-dioxabicyclo[4.3.0]non-3-enes (41-48%), 5-acetyl-2,2-diaryl-6-methyl-2,3-dihydrobenzo[b]furans (20–21%), 3-acetyl-5,5-diaryl-2-methyl-4
1,1-二苯乙烯,1,1-双(4-氯苯基)乙烯,1,1-双(4-甲基苯基)乙烯和1,1-双(4-甲氧基苯基)乙烯与3,5-的反应在乙酸锰(III)在乙酸中于80°存在下,通过二乙酰2,6-庚二酮[4.3.0]生成4,6-二乙酰-8,8-二芳基-1,3-二甲基-2,9-二氧杂双环[4.3.0 ] non-3-enes(41-48%),5-乙酰基-2,2-二芳基-6-甲基-2,3-二氢苯并[ b ]呋喃(20–21%),3-乙酰基-5,5 -二芳基-2-甲基-4,5-二氢呋喃(5–10%)和二苯甲酮(3–7%)。同样,1,1-二芳基醚与2,4-二乙酰基-1,5-戊二酸二甲酯或2,4-二乙酰基-1,5-戊二酸二乙酯反应得到相应的4,6-双(烷氧羰基)-8, 8-二芳基-1,3-二甲基-2,9-二氧杂双环[4.3.0] non-3-烯具有中等收率。