V
V. V. Pakal’nis
Researcher at Saint Petersburg State University
Publications - 19
Citations - 189
V. V. Pakal’nis is an academic researcher from Saint Petersburg State University. The author has contributed to research in topics: Tautomer & Ring (chemistry). The author has an hindex of 7, co-authored 19 publications receiving 168 citations.
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Recent advances in isoxazole chemistry
Alexey V. Galenko,Alexander F. Khlebnikov,Mikhail S. Novikov,V. V. Pakal’nis,Nikolai V. Rostovskii +4 more
TL;DR: In this paper, the preparation methods and reactions of isoxazoles are described and systematized on the basis of analysis of the literature published from 2005 to present, and major attention is focused on the most efficient approaches: condensation of hydroxylamine with 1,3-dielectrophiles and reactions with nitrile oxides with alkenes and alkynes.
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Isoxazolium N-ylides and 1-oxa-5-azahexa-1,3,5-trienes on the way from isoxazoles to 2H-1,3-oxazines.
Alexander F. Khlebnikov,Mikhail S. Novikov,Yelizaveta Gorbunova,Ekaterina E. Galenko,Kirill I. Mikhailov,V. V. Pakal’nis,Margarita S. Avdontceva +6 more
TL;DR: Theoretical and experimental studies of the reaction of isoxazoles with diazo compounds show that the formation of 2H-1,3-oxazines proceeds via theformation of (3Z)-1-oxa-5-azahexa- 1,3,5-trienes which undergo a 6π-cyclization.
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Selective syntheses of 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones via temperature-dependent Rh(II)-carbenoid-mediated 2H-azirine-ring expansion
TL;DR: In this article, the Rh(II)-catalyzed reaction of 2-carbonyl-substituted 2H-azirines with ethyl 2-cyano-2-diazoacetate or 2-dazo-3, 3,3,3-trifluoropropionate provides an easy access to 2-1,3oxazines and 1H-pyrrol-3(2H)-ones.
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Domino reactions of 2H-azirines with acylketenes from furan-2,3-diones: Competition between the formation of ortho-fused and bridged heterocyclic systems
Alexander F. Khlebnikov,Mikhail S. Novikov,V. V. Pakal’nis,Roman O. Iakovenko,Dmitry S. Yufit +4 more
TL;DR: In this article, 3-Aryl-2H-azirines react with acylketenes, generated by thermolysis of 5-arylfuran-2,3-diones, to give bridged 5,7-dioxa-1-azabicyclo[4.4.1]undeca-3,8-diene-2.10-dionses and/or ortho-fused 6,6a,12,12a-tetrahydrobis[1,3]ox
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Nonconcerted Cycloaddition of 2H-Azirines to Acylketenes: A Route to N-Bridgehead Heterocycles
TL;DR: According to DFT B3LYP/6-31G(d) computations, the formation of (4+2)-monoadducts proceeds via a stepwise non-pericyclic mechanism.