Halide trapping of the Nazarov intermediate in strained polycyclic systems: a new interrupted Nazarov reaction

被引：46

作者：

White, TD

West, FG

机构：

[1] Univ Alberta, Dept Chem, Edmonton, AB T6G 2G2, Canada

[2] Univ Utah, Dept Chem, Salt Lake City, UT 84112 USA

来源：

TETRAHEDRON LETTERS | 2005年 / 46卷 / 34期

关键词：

Nazarov cyclization; diastereoselective; Lewis acid; carbocation; halide;

D O I：

10.1016/j.tetlet.2005.06.101

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

1,4-Dien-3-ones encased within bridged bicyclic frameworks undergo efficient Nazarov electrocyclization upon treatment with TiCl4, but the resulting cyclopentenyl cations are trapped by chloride in preference to deprotonation. In contrast to the usual eliminative pathway, which destroys one of the stereocenters formed during electrocyclization, this process preserves both new centers and generates an additional one at the site of chloride trapping. Examples involving skeletal rearrangements and other Lewis acids are also discussed. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：5629 / 5632

页数：4

共 41 条

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