(3+3)-Annulation of Donor-Acceptor Cyclopropanes with Diaziridines
作者:Alexey O. Chagarovskiy、Vladimir S. Vasin、Vladimir V. Kuznetsov、Olga A. Ivanova、Victor B. Rybakov、Alexey N. Shumsky、Nina N. Makhova、Igor V. Trushkov
DOI:10.1002/anie.201805258
日期:2018.8.6
The first example of (3+3)‐annulation of two different three‐membered rings is reported herein. Donor‐acceptor cyclopropanes in reaction with diaziridines were found to afford perhydropyridazine derivatives in high yields and diastereoselectivity under mild Lewis acid catalysis. The disclosed reaction is applicable for the broad substrate scope and exhibits an excellent functional group tolerance.
Synthesis of 1‐Substituted Pyrazolines by Reaction of Donor‐Acceptor Cyclopropanes with 1,5‐Diazabicyclo[3.1.0]hexanes
作者:Alexey O. Chagarovskiy、Vladimir V. Kuznetsov、Olga A. Ivanova、Alexander S. Goloveshkin、Irina I. Levina、Nina N. Makhova、Igor V. Trushkov
DOI:10.1002/ejoc.201900579
日期:2019.9
A simple and efficient methodology for the synthesis of 1‐alkyl‐2,3‐dihydropyrazoles and the corresponding tetrahydropyridazines has been proposed. In this process bicyclic diaziridines were used as synthetic equivalent of difficultly accessible unsubstituted 2,3‐dihydropyrazole and unstable unsubstituted tetrahydropyridazine.
Synthesis of hexahydropyridazin-3-ones by reactions between donor-acceptor cyclopropanes and phenylhydrazine
作者:Alexey O. Chagarovskiy、Olga А. Ivanova、Alexey N. Shumsky、Igor V. Trushkov
DOI:10.1007/s10593-018-2203-4
日期:2017.11
perchlorate-initiated reaction between dimethyl esters of 2-aryl- and 2-styryl-substituted cyclopropane-1,1-dicarboxylic acids and phenylhydrazine proceeded with opening of the cyclopropane ring and formation of a mixture containing acyclic and cyclic products: [2-(1-phenylhydrazinyl)alkyl]malonates and 1-phenylhexahydropyridazin-3-ones. Reaction conditions were found for preparative synthesis of polyfunctional
[3+2] cycloaddition of vinyl cyclopropane and hydroxylamines via isocynate intermediate to γ‐lactams
作者:Xiaobing Huang、Jingxun Yu、Xinjun Luan
DOI:10.1002/cjoc.202300008
日期:——
efficient strategy for the synthesis of γ-lactams has been reported. The hydroxylamines form Lossen rearrangement products of electron-deficient group migration with base and then undergo [3+2] cycloaddition reaction with vinyl cyclopropane, which could be performed with broad substrate scope, excellent functional group tolerance and high efficiency to produce the desired products. It also allowed further modification
Advancing the Reactivity of Dimethylcyclopropane-1,1-dicarboxylates via Cross Metathesis
作者:Michael Kerr、Matt Vriesen、Huck Grover
DOI:10.1055/s-0033-1340460
日期:——
Cross metathesis of the readily available dimethyl 2-vinylcycloropane-1,1-dicarboxylate with a variety of olefins gave divergent access to new donor-acceptor cyclopropanes bearing a -donor alkenyl substituent. The synthetic utility of these cyclopropanes was shown by their participation in cycloaddition reactions with nitrones to yield the anticipated tetrahydro-1,2-oxazines. Hydrogenation yielded the alkyl-substituted adducts which would be more difficult to access via other means.