Reaction of 10,10-dimethyl-9-trimethylsiloxy-9,10-dihydrophenanthrene-9-carbonitrile with acids
摘要:
The behavior of 10,10-dimethyl-9-trimethylsiloxy-9,10-dihydrophenanthrene-9-carbonitrile in trifluoromethanesulfonic acid and acid systems CF(3)SO(3)H-CD(2)Cl(2), HSO(3)F-SO(2)ClF-CD(2)Cl(3), and CF(3)COOH-CD(2)Cl(2) were studied by NMR spectroscopy. Principal reaction schemes were determined; the first step in these schemes is protonation of the initial compound at the oxygen or nitrogen atom.
Trimethylsilylfluorosulfonate (TMSOFs): An alternative to TMS triflate as a source of Me3Si+
摘要:
Generation of trimethylsilylfluorosulfonate in situ provides a useful source of TMS+, the reactivity of which is essentially equivalent to that of TMS triflate. Its precursors, in particular FSO3H, are less costly than those of TMSOTf or the reagent itself
The kinetics of cleavage of alkyl groups and fluorine from five alkyldimethylfluorosilanes by fluorosulfonic acid dissolved in methylene chloride has been studied with proton magnetic resonance. Competitive cleavage of alkyl, methyl and fluoro occurs to form three products. A mechanism is proposed based on the third order kinetics which involves the formation of a pentacoordinate intermediate through
Further reactions of chlorine(I) and bromine(I) trifluoromethanesulfonate and bromine(I)fluorosulfate
作者:Kamalesh K. Johri、Yutaka Katsuhara、Darryl D. DesMarteau
DOI:10.1016/s0022-1139(00)83128-0
日期:1982.1
Substitutive electrophilic dehalogenation reactions of CF3SO2OX (X=Cl,Br) are reported with some covalent inorganic chlorides. These reactions result in the formation of XX′(X,X′Cl,Br) and several new trifluoromethanesulfonate derivatives in excellent yields. Chlorine(I) trifluoromethanesulfonate also oxidatively adds to unsaturated inorganic substrates such as CO, SO2 and SF4 forming new compounds
据报道,CF 3 SO 2 OX(X = Cl,Br)与某些共价无机氯化物的取代亲电脱卤反应。这些反应导致以极高的收率形成XX'(X,X'Cl,Br)和几种新的三氟甲磺酸酯衍生物。氯(I)三氟甲磺酸盐也氧化添加到不饱和无机基质(如CO,SO 2和SF 4)中,形成新化合物。CF 3 SO 2 OCl的反应性与FSO 2 OBr相当,并且给出了两者之间的一些比较。
Reactions of methyl(pentafluorophenyl)- and methyl(pentafluorophenyl)phenylsilanes with electrophiles. A convenient preparative route to halogeno(methyl)pentafluorophenylsilanes C6F5SiMe2X and C6F5SiMeX2 (X=F, Cl and Br)
作者:H.-J Frohn、A Lewin、V.V Bardin
DOI:10.1016/s0022-328x(98)00805-5
日期:1998.11
Halogeno(methyl)pentafluorophenylsilanes C6F5SiMenX3-n (n = 1, 2) (X = F, Cl, Br) were prepared in good yields from the corresponding phenylsilanes C6F5SiMenPh3-n by reactions with the electrophiles aHF, HCl-AlCl3, Br-2-AlBr3 or AlX3 (X = Cl, Br) halogenated hydrocarbons. Additionally, reactions of C6F5SiMe3 and (C6F5)(2)SiMe2 with selected electrophiles were studied. (C) 1998 Elsevier Science S.A. All rights reserved.
Haas, Alois; Wingender, Norbert, Zeitschrift fur Anorganische und Allgemeine Chemie
作者:Haas, Alois、Wingender, Norbert
DOI:——
日期:——
Synthesis of 20-deethylsilicine from a second-generation 2-cyano-.DELTA.3-piperidine synthon
作者:David S. Grierson、Jean Luc Bettiol、Ildiko Buck、Henri Philippe Husson、Mario Rubiralta、Anna Diez
DOI:10.1021/jo00050a012
日期:1992.11
The Zn2+ ion mediated reaction of the 2-cyano-DELTA3-piperidine 9a (X = SO2C6H5) with the silyl enol ether of Na-methyl-2-acetylindole (24) led to formation of compounds 29a,b (70%) resulting from introduction of the acetylindole moiety at the exocyclic (C-7) carbon center and migration of the phenylsulfonyl group from C-7 to C-4. In contrast, reaction of 2-Cyano-DELTA3-piperidine 9b (X = CN) with 24 gave the desired C-4 acetylindole-substituted products 36a,b (1:1.3 mixture; 72% overall yield). Attempts to cyclize intermediates 36 to the tetracyclic enamine 27 were unsuccessful. Alternatively, the Zn2+-catalyzed reaction of synthons 9a and 9b with indole gave the C-7 indole-substituted aminonitriles 37a,b and 38, respectively. These intermediates were converted to DELTA2-piperidine 40 on reaction with sodium dimethyl malonate and AgBF4. Stereoselective hydrogenation of the enamine double bond in 40 furnished the required cis 3,4-disubstituted piperidine 41, which was cyclized under acidic conditions to the target molecule, 20-deethylsilicine (20).