Amino groups are selectively protected in good yields by reaction with O-alkyl S-(pyridin-2-yl)carbonothiolates in an appropriate solvent at room temperature in air. Even glucosamine, which contains multiple hydroxyl groups, is selectively N-protected in methanol.
通过与 O-烷基 S-(吡啶-2-基)碳硫醇盐在适当的溶剂中在室温下在空气中反应,氨基以良好的产率被选择性地保护。甚至含有多个羟基的葡糖胺也在甲醇中被选择性地 N 保护。
Copper-Catalyzed One-Pot Synthesis of <i>N</i>-Aryl Oxazolidinones from Amino Alcohol Carbamates
作者:William Mahy、Pawel K. Plucinski、Christopher G. Frost
DOI:10.1021/ol502322c
日期:2014.10.3
sequential intramolecular cyclization of aminoalcoholcarbamates followed by Cu-catalyzed cross-coupling with aryl iodides under mild conditions has been developed. The reaction occurred in good yields and tolerated aryl iodides containing functionalities such as nitriles, ketones, ethers, and halogens. Heteroaryl iodides and substituted aminoalcoholcarbamates were also well tolerated.
function with an acidic NH group were prepared using the direct insertion of zinc dust into the corresponding alkyl iodides in THF or THF:DMSO mixtures. Most of the starting iodides were obtained from natural α-amino acids and the resulting zinc species afforded after transmentalation with CuCN·2LiCI and reaction with a selection of relatively reactive electrophiles a variety of polyfunctional 1,2-amino
Ligand-free Ullmann-type arylation of oxazolidinones by diaryliodonium salts
作者:Ekaterina V. Podrezova、Alina A. Okhina、Artem D. Rogachev、Sergey V. Baykov、Andreas Kirschning、Mekhman S. Yusubov、Natalia S. Soldatova、Pavel S. Postnikov
DOI:10.1039/d2ob02122f
日期:——
the copper-catalyzed N-arylation of hindered oxazolidinones using diaryliodoniumsalts. The method succeeds in good to excellent yields for the arylation of 4-alkyloxazolidinones, including sterically hindered isopropyl- and tert-butyl-substituted. The efficiency of the method was demonstrated for a wide range of diaryliodoniumsalts – symmetric and unsymmetric as well as ortho-substituted derivatives
A high-yielding low-cost facile synthesis of 2-oxazolidinones chiral auxiliaries
作者:Yikang Wu、Xin Shen
DOI:10.1016/s0957-4166(00)00415-8
日期:2000.11
The chiral aminol alcohols from reduction of amino acids with NaBH4/H2SO4 were directly treated with EtO2CCl to give the carbamates, which cyclized in the presence of traces of K2CO3 at 100-130 degreesC under vacuum to afford chiral 2-oxazolidinones in high yields. (C) 2000 Elsevier Science Ltd. All rights reserved.