Indium(III) Chloride-Promoted Intramolecular Addition of Allylstannanes to Alkynes
摘要:
In the presence of an equimolar amount of InCl3, 8-tributylstannyl-6-octen-1-ynes (allylstannanes bearing an alkynyl group) were efficiently cyclized to 2-allyl-1-methylenecyclopentanes. In contrast, catalytic use of InCl3 gave 2-allyl-1-(tributylstannylmethylene)cyclopentanes mainly by intramolecular allylstannylation. These cyclizations could proceed via intramolecular addition of an allylindium intermediate.
Iron-catalyzed addition of Grignard reagents to activated vinyl cyclopropanes
作者:Benjamin D. Sherry、Alois Fürstner
DOI:10.1039/b918818e
日期:——
A highly regioselective iron-catalyzed addition of branched primary, secondary or tertiary alkyl Grignardreagents to activated vinyl cyclopropanes is described, which likely proceeds by a direct addition mechanism as opposed to single electron transfer or an iron-allyl based process.
A new method for the synthesis of cyclopropane with three electron-withdrawing groups
作者:Chen Chen、Yao-Zeng Huang、Yanchang Shen
DOI:10.1016/0040-4039(88)85328-0
日期:1988.1
In the presence of trialkylstibine, dibromomalonic ester can react with electron-deficient olefins to give the title compounds in good yields.
在三烷基二b啶的存在下,二溴丙二酸酯可以与缺电子的烯烃反应,以高收率得到标题化合物。
Reactions of Enone Ethylene Ketals with Methyl Diazomalonate/Bis(acetylacetonato)copper(II)
作者:özkan Sezer、Ayşe Daut、Olcay Anaç
DOI:10.1002/hlca.19950780811
日期:1995.12.13
Several cyclic and acyclic enones and their ethylene ketals/acetals were reacted with dimethyl diazomalonate under bis(acetylacetonato)copper(II) catalysis. Cyclohex-2-en-1-one (1) yielded only C–H insertion products 2 and 3, whereas but-3-en-2-one gave a cyclopropane albeit in very low yield. The ethylene ketals 6 of cyclopent-2-en-1-one and cyclohex-2-en-1-one gave the corresponding cyclopropanes
Dibutyl telluride assists cyclopropanation of α,β-unsaturated ketone, ester, and nitrile with dibromomalonic esters without solvent at room temperature. In addition, it effects alkylidenation of aldehydes including α,β-unsaturated aldehyde with the same reagent.