A general procedure for the synthesis of isoxazolidin-5-ones
作者:Jack E. Baldwin、Laurence M. Harwood、Michael J. Lombard
DOI:10.1016/s0040-4020(01)98811-8
日期:——
Conjugate addition of N-substituted hydroxylamines to α,β-unsaturated esters followed by cyclisation of the adducts with lithium bis (trimethylsily)amide provides the first general means of synthesising isoxazolidin-5-ones, the N-benzyl derivatives of which may be hydrogenolised to β-aminoacids.
[EN] NITRATED HYDROCARBONS, DERIVATIVES, AND PROCESSES FOR THEIR MANUFACTURE<br/>[FR] HYDROCARBURES NITRÉS, DÉRIVÉS ET LEURS PROCÉDÉS DE PRODUCTION
申请人:ANGUS CHEMICAL
公开号:WO2009129097A1
公开(公告)日:2009-10-22
Provided is a process for the formation of nitrated compounds by the nitration of hydrocarbon compounds with dilute nitric acid. Also provided are processes for preparing industrially useful downstream derivatives of the nitrated compounds, as well as novel nitrated compounds and derivatives, and methods of using the derivatives in various applications.
Simple Reaction Conditions for the Formation of Ketonitrones from Ketones and Hydroxylamines
作者:Jennifer Y. Pfeiffer、André M. Beauchemin
DOI:10.1021/jo901653d
日期:2009.11.6
The condensation of ketones and hydroxylamines to form ketonitrones was reinvestigated by using thermal conditions previously found to minimize hydroxylamine decomposition (t-BuOH, 110 °C). This simple approach allows the formation of exocyclic, acyclic, and α,β-unsaturated ketonitrones with benzylic, linear, and branched nitrogen substituents in modest to excellent isolated yields.
Synthesis of N-substituted N-nitrosohydroxylamines as inhibitors of Mushroom Tyrosinase
作者:M Shiino
DOI:10.1016/s0968-0896(01)00003-7
日期:2001.5
A series of N-substituted N-nitrosohydroxylamines including six new compounds were synthesized and examined for inhibition of mushroom tyrosinase. Corresponding hydroxylamines were reacted with n-butyl nitrite to give substituted nitrosohydroxylamines as their ammonium salt. The N-substituted hydroxylamines were prepared from the primary amines via the oxaziridine, or from the carbonyl compounds via
The selectivehydrogenation of nitroalkanes to the corresponding N‐alkyl hydroxylamines is achieved at room temperature with excellent yields (up to 98 %), by using common supportedpalladiumcatalysts. The reaction temperature is key to the highly selective formation of the hydroxylamines, which proceeds smoothly in a H2 atmosphere without additives. The catalyst can be recycled up to five times.