(3 + 3)-Cyclodimerization of Donor–Acceptor Cyclopropanes. Three Routes to Six-Membered Rings
摘要:
The ability of donor acceptor cyclopropanes to (3 + 3)-cyclodimerize is disclosed. It has been found that Lewis acid-induced transformations of 2-(hetero)arylcyclopropane-1,1-dicarboxylates containing electron-abundant aromatic substituents led to the construction of six-membered cyclic systems. Depending on the substrate properties and the Lewis acid applied, three types of products can be obtained: (1) 1,4-diarylcyclohexanes, (2) 1-aryl-1,2,3,4-tetrahydronaphthalenes, and (3) 9,10-dihydroanthracenes.
(3 + 3)-Cyclodimerization of Donor–Acceptor Cyclopropanes. Three Routes to Six-Membered Rings
摘要:
The ability of donor acceptor cyclopropanes to (3 + 3)-cyclodimerize is disclosed. It has been found that Lewis acid-induced transformations of 2-(hetero)arylcyclopropane-1,1-dicarboxylates containing electron-abundant aromatic substituents led to the construction of six-membered cyclic systems. Depending on the substrate properties and the Lewis acid applied, three types of products can be obtained: (1) 1,4-diarylcyclohexanes, (2) 1-aryl-1,2,3,4-tetrahydronaphthalenes, and (3) 9,10-dihydroanthracenes.
Ring Opening of Donor–Acceptor Cyclopropanes with Cyanide Ion and Its Surrogates
作者:Maksim A. Boichenko、Ivan A. Andreev、Alexey O. Chagarovskiy、Irina I. Levina、Sergey S. Zhokhov、Igor V. Trushkov、Olga A. Ivanova
DOI:10.1021/acs.joc.9b03098
日期:2020.1.17
A straightforward method for ringopening of donor-acceptorcyclopropanes with trimethylsilyl cyanide as a surrogate of cyanide ion in the presence of B(C6F5)3 or trifluoromethanesulfonic acid as a catalyst has been developed. The methodology provides a short route to γ-cyanoesters that can be useful synthetic intermediates for the synthesis of diverse bioactive molecules such as glutaric and δ-aminovaleric
[3+2] Cyclodimerization of 2-arylcyclopropane-1,1-diesters. Lewis acid induced reversion of cyclopropane umpolung
作者:Alexey O. Chagarovskiy、Olga A. Ivanova、Ekaterina M. Budynina、Igor V. Trushkov、Mikhail Ya. Melnikov
DOI:10.1016/j.tetlet.2011.06.059
日期:2011.8
A novel Lewis acid catalyzed [3+2] cyclodimerization of 2-arylcyclopropane-1,1-dicarboxylates is reported. It is the first example of a reaction wherein a donor-acceptor cyclopropane provides two carbons in a newly formed ring. The described cyclodimerization represents a general convenient approach to polyfunctionalized cyclopentanes. (C) 2011 Elsevier Ltd. All rights reserved.