The reaction of various cyclopropyl bromides with I-PrMgCl˙LiCl in THF-dioxaneprovides the corresponding magnesiated cyclopropane reagents withcomplete retention of configuration.
Hantzsch Ester-Mediated Photochemical Transformations in the Ketone Series: Remote C(sp<sup>3</sup>)–H Arylation and Cyclopentene Synthesis through Strain Release
作者:Jan Paternoga、Jonas Kühlborn、Nils Ole Rossdam、Till Opatz
DOI:10.1021/acs.joc.0c02591
日期:2021.2.19
A metal-free Hantzsch ester-mediated synthesis of cyclopentenylketones as well as γ-hetarylketones starting from ketocyclopropanes under eco-friendly conditions was developed. The versatility of the developed conditions is shown by reacting ketocyclopropanes in both a formal [3 + 2] cycloaddition with terminal alkynes (further investigated using theoretical calculations) and a radical C–C-coupling
Harnessing Applied Potential: Selective β-Hydrocarboxylation of Substituted Olefins
作者:Anas Alkayal、Volodymyr Tabas、Stephanie Montanaro、Iain A. Wright、Andrei V. Malkov、Benjamin R. Buckley
DOI:10.1021/jacs.9b13305
日期:2020.1.29
The construction of carboxylic acid compounds in a selective fashion from low value materials such as alkenes remains a long-standing challenge to synthetic chemists. In particular, β-addition to styrenes is underdeveloped. Herein we report a new electrosynthetic approach to the selective hydrocarboxylation of alkenes that overcomes the limitations of current transition metal and photochemical approaches
Catalytic Reactions of Carbene Precursors on Bulk Gold Metal
作者:Yibo Zhou、Brian G. Trewyn、Robert J. Angelici、L. Keith Woo
DOI:10.1021/ja900653s
日期:2009.8.26
Bulk gold metal powder, consisting of particles (5-50 microm) much larger than nanoparticles, catalyzes the coupling of carbenes generated from diazoalkanes (R(2)C=N(2)) and 3,3-diphenylcyclopropene (DPCP) to form olefins. It also catalyzes cyclopropanationreactions of these carbeneprecursors with styrenes. The catalytic activity of the gold powder depends on the nature of the gold particles, as
散装金金属粉末,由比纳米粒子大得多的粒子 (5-50 微米) 组成,催化重氮烷烃 (R(2)C=N(2)) 和 3,3-二苯基环丙烯 (DPCP) 产生的卡宾的耦合形成烯烃。它还催化这些卡宾前体与苯乙烯的环丙烷化反应。金粉的催化活性取决于金颗粒的性质,这由 TEM 和 SEM 研究确定。可以从涉及生成卡宾 R(2)C:吸附在金表面上的中间体的机制来理解这些反应。
Intermolecular asymmetric cyclopropanation with diazoketones catalyzed by chiral ruthenium porphyrins
作者:Irène Nicolas、Paul Le Maux、Gérard Simonneaux
DOI:10.1016/j.tetlet.2008.01.129
日期:2008.3
The asymmetric addition of diazoacetophenone to styrene derivatives to give optically active cyclopropyl ketones (ee up to 86%) was carried out by using chiral ruthenium porphyrins as homogeneous catalysts.