Donor cyclopropanes in synthesis: utilising silylmethylcyclopropanes to prepare 2,5-disubstituted tetrahydrofurans
作者:Jonathan Dunn、Majid Motevalli、Adrian P. Dobbs
DOI:10.1016/j.tetlet.2011.10.091
日期:2011.12
The use of donor-only silylmethylcyclopropanes in the Lewis acid promoted reaction with aldehydes to generate 2,5-disubstitutedtetrahydrofurans is described. The diastereoselectivity obtained in the product is very much dependent upon the temperature of the reaction.
[3+2] Cycloaddition Reactions of Cyclopropylmethylsilanes and α-Keto Aldehydes: Trans- and Cis-selective Formation of 2-Silylmethyltetrahydrofurans
作者:Kohei Fuchibe、Yuji Aoki、Takahiko Akiyama
DOI:10.1246/cl.2005.538
日期:2005.4
Cyclopropylmethylsilanes and α-keto aldehydes underwent novel [3+2] cycloaddition reaction to afford 2-silylmethyl substituted tetrahydrofurans in good yields. Relative stereochemistries of the products were dependent on the reaction temperatures, trans- and cis-tetrahydrofurans were obtained stereoselectively at 0 °C and at −78 °C, respectively.
环丙基甲基硅烷和 α-酮醛发生了新颖的 [3+2] 环加成反应,以良好的收率获得了 2-硅甲基取代的四氢呋喃。产物的相对立体化学性质取决于反应温度,反式和顺式四氢呋喃分别在 0 °C 和 -78 °C 下立体选择性地获得。
Synthesis and reactions of donor cyclopropanes: efficient routes to cis - and trans -tetrahydrofurans
作者:Jonathan Dunn、Adrian P. Dobbs
DOI:10.1016/j.tet.2015.05.007
日期:2015.9
A detailed study on the synthesis and reactions of silylmethylcyclopropanes is reported. In their simplest form, these donor-only cyclopropanes undergo Lewis acid promoted reaction to give either cis- or trans-tetrahydrofurans, with the selectivity being reaction condition-dependant. The adducts themselves are demonstrated to be an important scaffold for structural diversification. The combination