The disclosure herein relates to a new process for the preparation of 3-dihaloacetyl (un)substituted oxazolidine compounds by the catalytic hydrogenation of nitroalcohols with aldehydes or ketones followed by reaction with a dihaloacetyl halide as shown below
wherein
The R and R₁₋₅ groups are independently H, C₁₋₆ alkyl, haloalkyl, alkylol or alkoxy or alkoxyalkyl having up to 8 carbon atoms, phenyl, benzyl or heterocyclyl having up to 10 carbon atoms and containing O, S and/or N ring atoms and
X and X₁ are independently halogen, preferably chlorine, bromine or iodine, especially chlorine.
本公开涉及一种制备 3-二卤乙酰基(未)取代噁唑烷化合物的新工艺,其方法是硝基醇与醛或酮催化加氢,然后与二卤乙酰卤反应,如下所示
其中
R和R₁₋₅基团独立地为H、具有最多8个碳原子的C₁₋₆烷基、卤代烷基、烷醇或烷氧基或烷氧基烷基、具有最多10个碳原子并含有O、S和/或N环原子的苯基、苄基或杂环基,以及
X 和 X₁ 独立地是卤素,最好是氯、溴或碘,尤其是氯。
Synthesis of 2,2-disubstituted N-nitrosooxazolidines with nitrosyl chloride
作者:Joseph E. Saavedra
DOI:10.1021/jo00213a037
日期:1985.6
SAAVEDRA, JOSEPH E.;FARNSWORTH, DAVID W.;PEI, GUO-KUI, SYNTH. COMMUN., 18,(1988) N 3, C. 313-322
作者:SAAVEDRA, JOSEPH E.、FARNSWORTH, DAVID W.、PEI, GUO-KUI
DOI:——
日期:——
US5428172A
申请人:——
公开号:US5428172A
公开(公告)日:1995-06-27
One-pot combination of enzyme and Pd nanoparticle catalysis for the synthesis of enantiomerically pure 1,2-amino alcohols
作者:Joerg H. Schrittwieser、Francesca Coccia、Selin Kara、Barbara Grischek、Wolfgang Kroutil、Nicola d'Alessandro、Frank Hollmann
DOI:10.1039/c3gc41666f
日期:——
2-azido ketones and Pd nanoparticle-catalysed hydrogenation of the resulting azido alcohols, which gives access to both enantiomers of aromatic 1,2-amino alcohols in high yields and excellent optical purity (ee >99%). Furthermore, we demonstrate the incorporation of an upstream azidolysis and a downstream acylation step into the one-pot system, thus establishing a highly integrated synthesis of the antiviral