Gold(I)-catalyzed intramolecular cyclopropanation of dienynes

被引：136
|
作者：
Nieto-Oberhuber, C
López, S
Muñoz, MP
Jiménez-Núñez, E
Buñuel, E
Cárdenas, DJ
Echavarren, AM
机构：
[1] Inst Chem Res Catalonia ICIQ, Tarragona 43007, Spain
[2] Univ Autonoma Madrid, Dept Quim Organ, E-28049 Madrid, Spain
来源：
CHEMISTRY-A EUROPEAN JOURNAL | 2006年 / 12卷 / 06期
关键词：
alkynes; cyclization; density functional calculations; gold; platinum; zinc;
D O I：
10.1002/chem.200501089
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Gold(I) complexes are the most active catalysts for the biscyclopropanation of dienynes to form tetracyclic compounds. Pt-II and Zn-II are also able to promote the biscyclopropanation, although less efficiently. The configurations obtained in all cases with the use of gold(I) catalysts can be explained by the pathway proceeding through anti cyclopropyl gold carbenes. Similar intermediates are most probably involved in reactions catalyzed by Ru-II and Pt-II. Two different cyclopropanation pathways have been found; they depend on the structures of the cyclopropyl gold carbenes (anti or syn) and the relative arrangements of the metal carbenes and the alkenes.
引用
收藏
页码：1694 / 1702
页数：9
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