A straightforward synthesis of phenylalanine analogs is described. Cerium ammonium nitrate (CAN) mediated addition of azide to cinnamic ester, followed by reaction with sodium acetate afforded the alpha-azidocinnamate in moderate yield. Hydrogenation of alpha-azidocinnamate, followed by BOC, CBZ or Fmoc protection gave phenylalanine analogs. A new approach for synthesizing racemic p-boronophenylalanine analog was also explored.
General and Easy Access to 11-Substituted 4-Hydroxy-2,3,4,5-tetrahydro[1,4]diazepino[1,2-<i>a</i>]indol-1-one Derivatives
作者:Benoît Joseph、Aurélien Putey、Guy Fournet
DOI:10.1055/s-2006-950249
日期:2006.10
An efficient route to prepare the 4-hydroxy-2,3,4,5-tetrahydro[1,4]diazepino[1,2-a]indol-1-one scaffold is described. The key reactions of the synthesis are an iodolactonisation followed by a lactone-to-lactam rearrangement. Various 11-substituted derivatives were obtained by palladium-mediated cross-coupling reactions.
Anionic [4+3] heteroannulation of 2-azidoacrylates: a modular synthesis of 2-benzazepin-1-ones
作者:Bidyut Kumar Dinda、Amit Kumar Jana、Dipakranjan Mal
DOI:10.1039/c2cc30279a
日期:——
2-Azidoacrylates undergo [4+3] annulation with phthalides under anionic conditions at low temperatures to furnish 5-hydroxy-2-benzazepinones, the formation of which represents a new concept for the construction of azepines as well as a new reactivity of 2-azidoacrylates.
A telescoped protocol for the synthesis of new pyrrolo [3,4-d]pyridazinones by cascade reactions
作者:Helio G. Bonacorso、Francieli M. Libero、Gean M. Dal Forno、Everton P. Pittaluga、Liliane M.F. Porte、Marcos A.P. Martins、Nilo Zanatta
DOI:10.1016/j.tetlet.2015.07.035
日期:2015.9
hydrazines to the ketone group present in the pyrroles previously formed, followed by intramolecular cyclization with the bordering ester, which furnishes the respective pyrrolo[3,4-d]pyridazinones, substituted at the pyrrole and/or pyridazinone rings. All transformations occur in a two-step one-pot methodology, and a series of ten new compounds were obtained at yields of 42–87%.
提出了一种新的一锅法,用于合成多取代的吡咯并[3,4- d ]哒嗪酮。该方案包括在相同的介质中进行的级联反应:(i)通过叠氮化物乙烯基与1,3-二羰基化合物的反应,通过1,3-二羰基化合物的1,2-加成反应形成的热原位吡咯2 H-叠氮基中间体; (ii)将肼亲核加成到先前形成的吡咯中存在的酮基上,然后用毗邻的酯进行分子内环化,从而提供各自的吡咯并[3,4- d]吡嗪酮,在吡咯和/或哒嗪酮环上取代。所有转化均采用两步法一锅法进行,获得了一系列十个新化合物,收率为42–87%。
[Fe(F20TPP)Cl] catalyzed intramolecular C–N bond formation for alkaloid synthesis using aryl azides as nitrogen source
作者:Yungen Liu、Jinhu Wei、Chi-Ming Che
DOI:10.1039/c0cc01825b
日期:——
tetrahydroquinolines, dihydroquinazolinones and quinazolinones have been accomplished in moderate to excellent yields via [Fe(F(20)TPP)Cl] catalyzed intramolecular C-N bond formation usingarylazides as nitrogensource.
Copper(I) complexes of tris(thioimidazolyl)borates (R′TmR), including [Cu(TmPh)(PR″3)] (R″ = Ph, Cu1; Cy, Cu2) and [Cu(R′TmPh)(PR″3)]+ (R′ = N-methylimidazole; R″ = Ph, Cy) were prepared and characterized by spectroscopic methods. The X-ray crystal structures of Cu1 and Cu2 feature a tripodal TmPh ligand coordinated in κ3-S,S,S mode. Using Cu2 as a catalyst (loading: 1 mol %), the aziridination of styrenes