Copper-catalyzed allylic hydroxyamination and amination of alkenes with Boc-hydroxylamine
摘要:
Olefins react regioselectively with Boc-NHOH in the presence of Cu(I,II) salts to produce allyl-N(OH)(Boc) derivatives, apparently via the intermediacy of Boc-N=O; yields and rates are dramatically improved by the addition of H2O2. The corresponding allylamine derivatives, allyl-NH(Boc), are formed selectively from Boc-NHOH/olefin with CuBr/P(OEt)(3). (C) 2005 Elsevier Ltd. All rights reserved.
Organic Dye-Photocatalyzed Acylnitroso Ene Reaction
作者:Yew Chin Teo、Yuanhang Pan、Choon Hong Tan
DOI:10.1002/cctc.201200435
日期:2013.1
operationally simple and uses air as the terminal oxidant. Reactions of acylnitroso with a range of functionalized alkenes give intermolecular acylnitroso ene products in moderate to good yields. This is an environmentally friendly allylicamination methodology that avoids the use of metal catalysts and stoichiometric amount of oxidants. A plausible reaction mechanism is proposed on the basis of singlet oxygen
Highly reactive acylnitroso intermediates were formed in situ by transition metals-catalyzed hydrogen peroxide oxidation of hydroxamicacids 1a–b and these transient species trapped with alkenes 2a–c to afford the corresponding ene products 3a–d and 4b up to 91% yield, and halocyclization of 3d gave substituted oxazolidinone 5a in 77% yield.
Copper-Catalyzed Aerobic Oxidation of Hydroxamic Acids Leads to a Mild and Versatile Acylnitroso Ene Reaction
作者:Charles P. Frazier、Jarred R. Engelking、Javier Read de Alaniz
DOI:10.1021/ja204603u
日期:2011.7.13
A mild formation of transient acylnitroso intermediates using a copper chloride catalyst and 1 atm of air as the terminal oxidant is described. The mild reaction conditions enable the inter- and intramolecular acylnitroso ene reaction with a wide range of functionalized alkene partners, as well as the first asymmetric variant. Notably, this transformation provides a practical and operationally simple method for effecting allylic amidation using an environmentally benign oxidant and a readily abundant transition metal.
A New Synthetic Route to Acylnitroso Intermediates and Their Applications in HDA and Ene Reactions
Diels-Alder (HDA) and enereactions. Methods: Acylnitroso intermediates were readily obtained by hydrogen peroxide oxidation of hydroxamic acids catalyzed by Cu(I)-, Ir(I)- or Ru(II)-complexes and easily reacted with symmetric and asymmetric conjugated dienes beside their reaction with different alkenes which converted to biological active products. Results: The resulted acylnitroso intermediates were efficiently
Copper-catalyzed allylic hydroxyamination and amination of alkenes with Boc-hydroxylamine
作者:Biswajit Kalita、Kenneth M. Nicholas
DOI:10.1016/j.tetlet.2005.01.024
日期:2005.2
Olefins react regioselectively with Boc-NHOH in the presence of Cu(I,II) salts to produce allyl-N(OH)(Boc) derivatives, apparently via the intermediacy of Boc-N=O; yields and rates are dramatically improved by the addition of H2O2. The corresponding allylamine derivatives, allyl-NH(Boc), are formed selectively from Boc-NHOH/olefin with CuBr/P(OEt)(3). (C) 2005 Elsevier Ltd. All rights reserved.