Unexpected formation of substituted naphthalenes and phenanthrenes in a GaCl3 mediated dimerization–fragmentation reaction of 2-arylcyclopropane-1,1-dicarboxylates
摘要:
Dimethyl 2-arylcyclopropane-1,1-dicarboxylates on heating with GaCl3 undergo dimerization to afford arylnaphthalenes or phenanthrenes. A possible reaction mechanism including elimination of two dimethyl malonate molecules was proposed, dimethyl malonate gallium complex Ga3+[H2C(CO2Me)(2)}](3)(GaCl4-)(3) was isolated and characterized by X-ray diffraction analysis.
Copper-Catalyzed Oxidative Dehydrogenative Reaction of Quinoline-<i>N</i>-Oxides with Donor–Acceptor Cyclopropanes: Installation of a Tertiary Alkyl Motif at C2 Position
作者:Bikash Kumar Sarmah、Monuranjan Konwar、Animesh Das
DOI:10.1021/acs.orglett.1c03115
日期:2021.11.5
A copper-catalyzed oxidativedehydrogenative reaction of quinoline N-oxides with donor–acceptor cyclopropanes has been demonstrated to construct C2-alkylated quinolines containing a γ-keto diester motif. The use of molecularoxygen as an oxidant, excellent site-selectivity, and good functional group tolerance are the important features in this process. The preliminary mechanistic studies demonstrate
Stereospecific Copper(II)-Catalyzed Tandem Ring Opening/Oxidative Alkylation of Donor–Acceptor Cyclopropanes with Hydrazones: Synthesis of Tetrahydropyridazines
Aerobic copper(II)-catalyzed tandem ringopening and oxidative C–H alkylation of donor–acceptorcyclopropanes with bisaryl hydrazones is accomplished to produce tetrahydropyridazines, in which copper(II) plays dual role as a Lewis acid as well as redox catalyst. The reaction is stereospecific, and optically active cyclopropanes can be reacted with high optical purities (89–98% enantiomeric excess)
Rhodium-Catalyzed Cyclopropanation of Alkenes with Dimethyl Diazomalonate
作者:Francisco González-Bobes、Michaël D. B. Fenster、Susanne Kiau、Laxma Kolla、Sergei Kolotuchin、Maxime Soumeillant
DOI:10.1002/adsc.200800027
日期:2008.4.7
α′-tetramethyl-1,3-benzenedipropanoate] to catalyze the cyclopropanation of a wide range of alkenes with malonate-derived carbenoids under mild reaction conditions is reported in this communication. The experimental protocol is remarkably simple, uses readily accessible and stable dimethyldiazomalonate with very low catalyst loading. More importantly, the alkene is employed as a limiting reagent.
Ring opening of DA-cyclopropanes with electron rich arene/heteroarene: synthesis of 2-(2,2-diarylethyl)malonates
作者:Ranadeep Talukdar、Amrita Saha、Deo Prakash Tiwari、Manas K. Ghorai
DOI:10.1016/j.tet.2015.12.001
日期:2016.2
strategy for nucleophilic ring opening of donor-acceptor (DA)-cyclopropanes with electronrich arenes to provide 2-(2,2-diarylethyl)malonates in excellent yields is described. The reaction was found to be successful with heteroarenes as the nucleophile as well. Reaction of enantiopure DA-cyclopropane with arene/heteroarene as the nucleophiles afforded the corresponding 2-(2,2-diarylethyl)malonates with
[4 + 2] Annulation of Donor–Acceptor Cyclopropanes with Acetylenes Using 1,2-Zwitterionic Reactivity
作者:Roman A. Novikov、Anna V. Tarasova、Dmitry A. Denisov、Denis D. Borisov、Victor A. Korolev、Vladimir P. Timofeev、Yury V. Tomilov
DOI:10.1021/acs.joc.7b00209
日期:2017.3.3
of donor–acceptor cyclopropanes with acetylenes under the effect of anhydrous GaCl3 using 1,2-zwitterion reactivity was elaborated. The reaction opens access to substituteddihydronaphthalenes, naphthalenes, and other fused carbocycles. The direction of the reaction can be efficiently controlled by temperature.