A [4 + 4] annulation strategy for the synthesis of eight-membered carbocycles based on intramolecular cycloadditions of conjugated enynes.

A [4 + 4] annulation strategy for the synthesis of eight-membered carbocycles based on intramolecular cycloadditions of conjugated enynes.
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A [4 + 4]基于共轭Enynes的分子内环载量合成八元的碳循环的环形策略。

DOI:
10.1016/j.tet.2011.09.031
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发表时间:
2011-12
期刊:
影响因子:
2.1
通讯作者:
Danheiser RL
Danheiser RL
中科院分区:
化学3区
文献类型:
--
作者:
Robinson JM;Tlais SF;Fong J;Danheiser RL

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报道了一种通过两个周环级联反应合成八元碳环的[4 + 4]成环策略。在第一步中,共轭烯炔与缺电子环丁烯的[4 + 2]环加成生成应变的六元环状丙二烯,其异构化为相应的1,3-环己二烯。在第二步中,该双环[4.2.0]辛-2,4-二烯中间体经历热或酸促进的6-电子电环开环以提供2,4,6-环辛三烯酮。后者的转变代表了第一个例子,促进6-电子的电环开环反应的酸。
A [4 + 4] annulation strategy for the synthesis of eight-membered carbocycles is reported that proceeds via a cascade involving two pericyclic processes. In the first step, the [4 + 2] cycloaddition of a conjugated enyne with an electron-deficient cyclobutene generates a strained six-membered cyclic allene that isomerizes to the corresponding 1,3-cyclohexadiene. In the second step, this bicyclo[4.2.0]octa-2,4-diene intermediate undergoes thermal or acid-promoted 6-electron electrocyclic ring opening to furnish a 2,4,6-cyclooctatrienone. The latter transformation represents the first example of the promotion of 6-electron electrocyclic ring opening reactions by acid.
DOI: 10.1016/s0040-4020(01)91012-9
发表时间: 1991-09-16
期刊: TETRAHEDRON
影响因子: 2.1
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