Réactivité du 3,3-bis(triméthylsilyl)propène vis-à-vis des ions iminium issus d'amines secondaires. Accès stéréosélectif à des (E)-β-aminovinylsilanes
摘要:
The 3,3-bis(trimethylsilyl)propene reacts with iminium ions generated in situ from secondary amines by an aminomethylation-desilylation process, leading to (E)-beta-aminovinylsilanes. When a secondary amine with two secondary groups is used, the reaction fails, the steric hindrance probably inhibiting the reaction.
The conversion of an aziridine plus an iminium salt to a 1,2-diamine
作者:Matthew T. Hancock、Allan R. Pinhas
DOI:10.1016/s0040-4039(03)01833-1
日期:2003.9
The conversion of an aziridine to a 1,2-diamine using lithium iodide and an iminium salt is discussed. We have found that when the aziridine is substituted by only alkyl groups, it is the less substituted carbonnitrogen bond that is broken; whereas, when the aziridine is substituted by a phenyl group at either the nitrogen or the carbon, it is the more substituted carbonnitrogen bond that is broken
Stereoselective synthesis of oxazino[4,3-a]indoles employing the oxa-Pictet–Spengler reaction of indoles bearing N-tethered vinylogous carbonate
作者:Santosh J. Gharpure、A. M. Sathiyanarayanan
DOI:10.1039/c0cc05558a
日期:——
A one-pot, sequential 2,3-bis-functionalization of indoles bearing N-tethered vinylogous carbonates employing an intramolecular oxa-PictetâSpengler reaction followed by electrophilic substitution is developed for the stereoselective synthesis of oxazino[4,3-a]indoles.
Tidwell, Jeffrey H.; Senn, Dwayne R.; Buchwald, Stephen L., Journal of the American Chemical Society, 1991, vol. 113, # 12, p. 4685 - 4686
作者:Tidwell, Jeffrey H.、Senn, Dwayne R.、Buchwald, Stephen L.
DOI:——
日期:——
Novel 7-hydroxycoumarin based fluorescent labels
作者:Maciej Adamczyk、Michael Cornwell、Jeff Huff、Sushil Rege、Tata Venkata S. Rao
DOI:10.1016/s0960-894x(97)00345-4
日期:1997.8
Five new 7-hydroxy-8-(N-alkylaminomethyl)coumarin labels (6a-e) were prepared from 4-(4-carboxybutyl)-7-hydroxycoumarin (4) in 28-48% yield. Compared to 4-methylumbelliferone (4-MU, 1), the new fluorescent labels exhibited higher emission intensity over a broader pH range. Extinction coefficients, quantum yields and pKa values are also reported for these labels. (C) 1997 Elsevier Science Ltd.
Casado, Julia; Mosquera, Manuel; Paz, L. Carlos, Journal of the Chemical Society. Perkin transactions II, 1984, p. 1963 - 1966
作者:Casado, Julia、Mosquera, Manuel、Paz, L. Carlos、Prieto, M. Flor Rodriguez、Tato, Jose Vazquez