使用一氧化碳和硫醇对烯烃进行氢硫羰基化是从简单结构单元合成硫酯的有效方法。由于催化剂中毒的固有挑战,过渡金属催化的不对称硫代羰基化,特别是在利用地球丰富的金属时,在文献中仍然很少见。在此,我们报道了镍催化的环丙烯对映选择性硫代羰基化反应,用于合成多种官能化硫酯,收率良好至优异,具有高立体选择性。这种新方法采用廉价、空气稳定的镍 (II) 前驱体,与镍 (0) 催化剂相比,它可以提高催化剂保真度,防止 CO 中毒。
Reductive Cyclopropanations Catalyzed by Dinuclear Nickel Complexes
作者:You-Yun Zhou、Christopher Uyeda
DOI:10.1002/anie.201511271
日期:2016.2.24
Dinuclear Ni complexes supported by naphthyridine‐diimine (NDI) ligands catalyze the reductive cyclopropanation of alkenes with CH2Cl2 as the methylene source. The use of mild terminal reductants (Zn or Et2Zn) confers significant functional‐group tolerance, and the catalyst accommodates structurally and electronically diverse alkenes. Mononickel catalysts bearing related N chelates afford comparatively
Convenient Access to Various 1-Cyclopropylcyclopropane Derivatives
作者:Armin de Meijere、Alexander F. Khlebnikov、Hans Wolf Sünnemann、Daniel Frank、Karsten Rauch、Dmitrii S. Yufit
DOI:10.1002/ejoc.201000209
日期:2010.6
―78 °C, and the resulting 1-lithio-1-cyclopropylcyclopropane can be trapped with various electrophiles to give the correspondingly 1-substituted bicyclopropyl derivatives 10 in yields ranging from 38 to over 90 % (13 examples). The (1-cyclopropylcyclopropyl)boronate 10m, which is also obtained from the 1-lithio derivative, has been subjected to Suzuki cross couplings with a number of aryl halides to
Direct Photoexcitable Iodomethylborate Enabling Cyclopropanation of Reactive Alkenes
作者:Rikako Nakamura、Yuto Sumida、Hirohisa Ohmiya
DOI:10.1246/bcsj.20220112
日期:2022.7.15
Radical-mediated cyclopropanation tool for reactive alkenes including dehydroamino acids (DHAAs) has been developed based on directly photoexcitable borate generating iodomethyl radical under visible light irradiation. The borate at the excited state serves as a strong single electron reductant. Therefore, this photoexcitable borate offers a simple protocol for cyclopropanation of DHAAs to forge m
Redox-Neutral Photocatalytic Cyclopropanation via Radical/Polar Crossover
作者:James P. Phelan、Simon B. Lang、Jordan S. Compton、Christopher B. Kelly、Ryan Dykstra、Osvaldo Gutierrez、Gary A. Molander
DOI:10.1021/jacs.8b05243
日期:2018.6.27
A benchtop stable, bifunctional reagent for the redox-neutral cyclopropanation of olefins has been developed. Triethylammonium bis(catecholato)iodomethylsilicate can be readily prepared on multigram scale. Using this reagent in combination with an organic photocatalyst and visible light, cyclopropanation of an array of olefins, including trifluoromethyl- and pinacolatoboryl-substituted alkenes, can
in the literature. Herein, we report a nickel-catalyzed enantioselective hydrothiocarbonylation of cyclopropenes for the synthesis of a diverse collection of functionalized thioesters in good to excellent yields with high stereoselectivity. This new method employs an inexpensive, air-stable nickel(II) precursor, which provides enhanced catalyst fidelity against CO poisoning compared to nickel(0) catalysts
使用一氧化碳和硫醇对烯烃进行氢硫羰基化是从简单结构单元合成硫酯的有效方法。由于催化剂中毒的固有挑战,过渡金属催化的不对称硫代羰基化,特别是在利用地球丰富的金属时,在文献中仍然很少见。在此,我们报道了镍催化的环丙烯对映选择性硫代羰基化反应,用于合成多种官能化硫酯,收率良好至优异,具有高立体选择性。这种新方法采用廉价、空气稳定的镍 (II) 前驱体,与镍 (0) 催化剂相比,它可以提高催化剂保真度,防止 CO 中毒。