An Improved Process for the Synthesis and Isolation of (S)-N-(1-Phenylethyl)hydroxylamine
摘要:
A three-step, single-solvent telescoped process amenable to the large-scale manufacture of (S)-N-(1-phenylethyl)hydroxylamine p-toluenesulfonic acid salt is reported. This synthetic protocol has been applied to the preparation of other chiral hydroxylamines.
作者:Fachao Yan、Zijun Huang、Chen-Xia Du、Jian-Fei Bai、Yuehui Li
DOI:10.1016/j.jcat.2021.01.003
日期:2021.3
Streckerreaction is widely applied for the synthesis of amino acids from aldehydes, amines and cyanides. Herein, we report the FeI2-catalyzed reductive Strecker type reaction of formamides instead of aldehydes to produce amino acetonitriles. The challenging capture of carbinolamine intermediates by CN− was achieved via Fe catalysis. This approach afforded better yields than the use of Ir- or Rh-catalysts
A novel transformation of primary amines to the corresponding N-monoalkylhydroxylamines is described. The three-step protocol involves selective mono-cyanomethylation of primary amines, regioselective formation of nitrones by m-CPBA oxidation, and hydroxylaminolysis of the nitrones with hydroxylamine hydrochloride. The method is applicable for a wide range of primary amines, including alkyl, benzyl, and chiral.
Conjugate addition of lithium N-tert-butyldimethylsilyloxy-N-(α-methylbenzyl)amide: asymmetric synthesis of β2,2,3-trisubstituted amino acids
作者:Scott A. Bentley、Stephen G. Davies、James A. Lee、Paul M. Roberts、Angela J. Russell、James E. Thomson、Steven M. Toms
DOI:10.1016/j.tet.2010.04.027
日期:2010.6
Conjugateaddition of the homochiral ammonia equivalent lithium N-tert-butyldimethylsilyloxy-N-(α-methylbenzyl)amide to a range of α,β-unsaturatedesters gives the corresponding β-amino esters in moderate to good levels of diastereoselectivity. O-Desilylation and cyclisation furnishes homochiral isoxazolidin-5-ones in >99:1 dr after purification. Sequential alkylation of these templates proceeds to
A process for preparing a salt of compound of formula (I)
wherein R
1
and R
2
are independently selected from an organic group other than hydrogen, said process comprising reacting a compound of formula (II)
with water and an organic acid, in the absence of hydroxylamine. The reaction is useful in preparing a range of chemical intermediates, in particular chiral compounds.
[EN] A process for preparing a salt of compound of Formula (I), (Formula I) wherein R1 and R2 are independently selected from an organic group other than hydrogen, said process comprising reacting a compound of Formula (II), (Formula II) with water and an organic acid, in the absence of hydroxylamine. The reaction is useful in preparing a range of chemical intermediates, in particular chiral compounds. [FR] La présente invention concerne un procédé de préparation d'un sel de composé répondant à la formule (I), (formule I) dans laquelle R1 et R2 sont indépendamment choisis parmi un groupe organique différent d'un atome d'hydrogène, ledit procédé comprenant la réaction d'un composé répondant à la formule (II), (formule II) avec de l'eau et un acide organique, en l'absence d'hydroxylamine. La réaction est utile dans la préparation d'une gamme d'intermédiaires chimiques, en particulier des composés chiraux.