Results 101 to 110 of about 74,332 (157)

2H-Azirines as Synthetic Tools in Organic Chemistry

European Journal of Organic Chemistry, 2001
The versatility and the high synthetic potential including the asymmetric syntheses of 2H-azirines as valuable precursors for the preparation of a wide range of polyfunctional acyclic and cyclic compounds, is discussed.
F Palacios
exaly   +2 more sources

Recent approaches to the synthesis of 2H-azirines

Chemistry of Heterocyclic Compounds, 2019
The most recent (2013–2018) synthetic approaches toward 2H-azirine derivatives are summarized and discussed. This minireview covers the latest examples on the synthesis of 2H-azirines that can be gathered in five distinct categories: the Neber approach, decomposition of vinyl azides, ring contraction of isoxazoles, oxidative cyclization of enamine ...
Ramkumar N., Voskressensky L.G., Sharma U.K., Van Der Eycken E.V.   +3 more
openaire   +3 more sources

Synthesis and reactivity of 2-halo-2H-azirines towards nucleophiles [PDF]

Tetrahedron Letters, 2000
Nucleophilic substitution reactions of 2-halo-2H-azirine with potassium phthalimide and aniline allowed the preparation of new substituted 2H-azirines.

exaly   +2 more sources

Enantioselective addition of organolithium reagents to a 2H-azirine

Tetrahedron: Asymmetry, 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
Erik Risberg, Peter Somfai
openaire   +1 more source

A Simple Green Procedure for the Synthesis of 2H‐Azirines.

ChemInform, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
Pradeep N.D Singh, Carrie L Carter, Anna D Gudmundsdóttir   +2 more
openaire   +1 more source

Electronic structures of vinylazide, vinylnitrene and 2H-azirine. Mechanism of the reaction from vinylazide to 2H-azirine

Tetrahedron, 1984
Abstract The mechanism of the conversion of vinylazides into 2H-azirines is examined by use of ab initio MO calculations. It is ascertained that vinylnitrenes have very weak bonds between the vinylazides and nitrogen molecule parts. It seems to decompose readily into the two fragments.
Tokio Yamabe, Meguru Kaminoyama, Tsutomu Minato, Kenzi Hori, Kazuaki Isomura, Hiroshi Taniguchi   +5 more
openaire   +1 more source

Conical intersections and photoreactions of 2H-azirines

Chemical Physics, 2000
Abstract CASSCF calculations were performed on the nπ * - and ππ * -excited states of 2 H -azirine as well as some alkyl-substituted 2 H -azirines. An S 1 /S 0 conical intersection (CI) was located, through which a direct formation of nitrile ylide can occur.
Christian Bornemann, Martin Klessinger
openaire   +1 more source

Photocycloaddition reactions of a bis-2H-azirine

Journal of the Chemical Society, Chemical Communications, 1977
Irradiation of 3,3′-(2,2′-biphenylene)bis-(2H)-azirine with electron-deficient dipolarophiles gives cycloadducts derived from a transient azabicyclo[3.1.0]hexene intermediate.
Albert Padwa, Hao Ku
openaire   +1 more source

Equilibration of 2H-azirine with vinylnitrene

Journal of the Chemical Society, Chemical Communications, 1972
Treatment of 2,3-diaryl-2H-azirine-2-carboxamide with triphenylphosphine and carbon tetrachloride affords the triphenyliminophosphorane (4).
openaire   +1 more source

Organocatalyzed nucleophilic addition of pyrazoles to 2H-azirines: asymmetric synthesis of 3,3-disubstituted aziridines and kinetic resolution of racemic 2H-azirines

Chemical Communications, 2016
An asymmetric nucleophilic addition of pyrazoles to 2 H -azirines via organocatalytic kinetic resolution afforded chiral aziridines and azirines simultaneously.
Dong, An, Xukai, Guan, Rui, Guan, Lajiao, Jin, Guangliang, Zhang, Suoqin, Zhang   +5 more
openaire   +2 more sources