Copper-Catalyzed Asymmetric Synthesis of Tertiary α-Hydroxy Phosphonic Acid Derivatives with In Situ Generated Nitrosocarbonyl Compounds as the Oxygen Source
作者:Biplab Maji、Hisashi Yamamoto
DOI:10.1002/anie.201408893
日期:2014.12.22
α‐Hydroxy phosphonic acids and their derivatives are highly bioactive structural motifs. It is now reported that these compounds can be accessed through the copper‐catalyzed direct α‐oxidation of β‐ketophosphonates using in situ generated nitrosocarbonyl compounds as an electrophilic oxygen source. These reactions proceeded in high yields (up to 95 %) and enantioselectivities (up to >99 % ee) for both
A New One-Pot Synthesis of Dialkyl Phosphonates from Diazo Compounds and Dialkyl Hydrogen Phosphites
作者:Alexander M. Polozov、Nina A. Polezhaeva、Albert H. Mustaphin、Alexander V. Khotinen、Boris A. Arbuzov
DOI:10.1055/s-1990-26924
日期:——
Bis(acetylacetonato)copper(II) is an effective catalyst for the preparation of dialkyl phosphonates from diazo compounds and dialkyl hydrogen phosphites. This method complements the classical ones and makes 2-dialkoxyphosphoryl-1,3-dicarbonyl compounds available.
Facile Dephosphonylation of β-Ketophosphonic Acids: Mechanistic Studies
作者:Michael J. Hawkins、Eugene T. Powell、Gregory C. Leo、Diane A. Gauthier、Michael N. Greco、Bruce Maryanoff
DOI:10.1021/ol060519l
日期:2006.8.1
We have found that beta-ketophosphonic acids can undergo facile dephosphonylation under fairly mild conditions. The rate of dephosphonylation is dependent on the electronic nature of the substituent on the carbon atom alpha to phosphorus, with electron-withdrawing groups accelerating the process. P-31 NMR studies were used to probe the mechanism for the process.