(Alk-1-ynyl)organylthiocarbenes: generation and reactions with olefins
作者:K. N. Shavrin、V. D. Gvozdev、I. Yu. Pinus、I. P. Dotsenko、O. M. Nefedov
DOI:10.1007/s11172-005-0152-4
日期:2004.11
belonging to previously unknown type of allenic compounds were synthesized by chlorination of 1-organylthioalk-1-ynes 3a–f with N-chlorosuccinimide. The reactions of compounds 1a–f with ButOK in hexane at −20 °C are accompanied by γ-elimination of HCl to give new alk-1-ynyl(organylthio)carbenes 2a–f, which add to olefins to form the corresponding 1-(alk-1-ynyl)-1-organylthiocyclopropanes 5 in yields
ARLANDINI, E.;BALLABIO, M.;DA, PRADA, L.;ROSSI, L. M.;TRIMARCO, P., J. CHEM. RES. RES. MICROFICHE, 1983, N 7, 170-171
作者:ARLANDINI, E.、BALLABIO, M.、DA, PRADA, L.、ROSSI, L. M.、TRIMARCO, P.
DOI:——
日期:——
Reactions of Unsaturated Azides; Part 17:An Efficient Strategy for the Synthesis of Small-Ring Heterocycles via Isomerization of 2-Halo-2<i>H</i>-azirines
作者:Klaus Banert、Joseph Rodolph Fotsing
DOI:10.1055/s-2005-918513
日期:——
New acceptor-substituted allenyl halides were synthesized. The addition of hydrazoic acid (HN3) to these allenyl halides led to the formation of new 1-azido-2-haloethene derivatives. The photolysis of the latter compounds afforded the corresponding 2-halo-2H-azirines. At room temperature or below, they isomerized irreversibly by [1,2]-rearrangement of halogen to form other azirine isomers in very good yields. It is the first time that such a complete rearrangement of 2-halo-2H-azirines is observed. This synthetic strategy offers the possibility to observe both azirine isomers in their pure forms from single 1-azido-2-haloethene precursor.