7207-51-4Relevant academic research and scientific papers
Intermolecular cope-type hydroamination of alkenes and alkynes
Beauchemin, Andre M.,Moran, Joseph,Lebrun, Marie-Eve,Seguin, Catherine,Dimitrijevic, Elena,Zhang, Lili,Gorelsky, Serge I.
, p. 1410 - 1413 (2008/12/23)
(Chemical Equation Presented) Keep it simple! Intermolecular hydroamination can be achieved simply upon heating alkynes and alkenes with aqueous hydroxylamine. Alkynes react to afford oximes in good to excellent yields, and the formation of Markovnikov products is favored. A mechanism involving Cope-type hydroamination followed by bimolecular proton transfer is suggested and supported by DFT studies.
Intermolecular Cope-type hydroamination of alkenes and alkynes using hydroxylamines
Moran, Joseph,Gorelsky, Serge I.,Dimitrijevic, Elena,Lebrun, Marie-Eve,Bedard, Anne-Catherine,Seguin, Catherine,Beauchemin, Andre M.
supporting information; scheme or table, p. 17893 - 17906 (2009/07/18)
The development of the Cope-type hydroamination as a method for the metal- and acid-free intermolecular hydroamination of hydroxylamines with alkenes and alkynes is described. Aqueous hydroxylamine reacts efficiently with alkynes in a Markovnikov fashion to give oximes and with strained alkenes to give N-alkylhydroxylamines, while unstrained alkenes are more challenging. N-Alkylhydroxy-lamines also display similar reactivity with strained alkenes and give modest to good yields with vinylarenes. Electron-rich vinylarenes lead to branched products while electron-deficient vinylarenes give linear products. A beneficial additive effect is observed with sodium cyanoborohydride, the extent of which is dependent on the structure of the hydroxylamine. The reaction conditions are found to be compatible with common protecting groups, free OH and NH bonds, as well as bromoarenes. Both experimental and theoretical results suggest the proton transfer step of the N-oxide intermediate is of vital importance in the intermolecular reactions of alkenes. Details are disclosed concerning optimization, reaction scope, limitations, and theoretical analysis by DFT, which includes a detailed molecular orbital description for the concerted hydroamination process and an exhaustive set of calculated potential energy surfaces for the reactions of various alkenes, alkynes, and hydroxylamines.
Classical Carbonium Ions. Part 12. The Deamination of 1- and 4-Amino-n-octane
Southam, Richard M.,Whiting, Mark C.
, p. 597 - 604 (2007/10/02)
The deamination products of 1- and 4-amino-octane in acetic acid were examined.The amines were treated with sodium nitrite directly, and also converted into alkylaryltriazenes derived from several arenediazonium cations, which were then acetolysed.N-Nitrosobutyramides were acetolysed, and N-nitrosoacetamides were butyrolysed, to allow the seperate analysis of rearranged and unrearranged products from internal and external nucleophiles.It is concluded that the primary alkylamine is converted by all these different methods in high yield into a primary alkane diazonium ion RN2+, the properties of which are independent of its method of preparation in that the alkyl cation formed by its decomposition does not capture the leaving group which accompanies its formation, but reacts with solvent to give a constant set of products.The secondary alkylamine behaves differently.Its diazo-derivatives, RN2X, usually undergo effectively concerted decomposition to carbonium ions, nitrogen, and leaving group X.The cations show differing degrees of hydride shift, and capture the internal nucleophile X to a considerable but variable extent, after as well as before rearrangement.The acetolysis of 4-diazo-octane proceeds via a much less reactive intermediate, possibly an intimate ion-pair, giving mainly unrearranged 4-acetoxyoctane, plus an olefin mixture in which the substantial proportion of cis-isomers reflects the conformational preference of the starting material.
