Stereodivergent synthesis of β-amino-α-hydroxyphosphonic acid derivatives by lewis acid mediated stereosclective hydrophosphonylation of α-amino aldehydes
摘要:
The highly diastereoselective synthesis of beta-amino-alpha-hydroxyphosphonic acid derivatives was achieved by Lewis acid mediated hydrophosphonylation of alpha-dibenzylamino aldehyde. Diastereofacial differentiation could be controlled in either a chelation or a nonchelation manner by simple tuning of the nature of phosphoric nucleophiles.
GRAPHICAL ABSTRACT ABSTRACT Interest in synthesis of fluorinated aminophosphonates has grown significantly in recent years due to their promising applications in medicinal and bioorganic chemistry. We report herein efficient and general methods for the synthesis of α- and β-monofluorinated aminophosphonates. Series of β-fluoro aminophosphonates were prepared in nucleophilic DAST-mediated fluorination
Towards Convenient Precursors for α -Phosphonylated Aziridinium Ions
作者:Dorota G. Piotrowska、Andrzej E. Wróblewski
DOI:10.1080/10426500902719867
日期:2009.4.7
mesylation of dimethyl (1R,2S)-2-(N,N-dibenzylamino)-1-hydroxy-3-methylbutylphosphonate and diethyl (1R,2S)-2-(N,N-dibenzylamino)-1-hydroxy-3-phenylpropylphosphonate with mesylchloride in the presence of tetraethylammonium chloride. These mixtures are considered as useful precursors to α -phosphonylated aziridinium ions.
DAST mediated preparation of β-fluoro-α-aminophosphonates
作者:Marcin Kaźmierczak、Henryk Koroniak
DOI:10.1016/j.jfluchem.2012.03.016
日期:2012.7
Herein, we report a new and convenient method for the synthesis of beta-fluoro-alpha-aminophosphonates starting from naturally occurring L-amino acids. A key step in the synthetic protocol involves nucleophilic fluorination of N,N-dibenzylated-beta-amino alcohols with diethylaminosulfur trifluoride (DAST). (C) 2012 Elsevier B.V. All rights reserved.
Asymmetric Synthesis of 1-Hydroxy-2-alkylphosphonic Acids