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
Nucleophilic addition to the carbonyl group of β-keto phosphonates has been studied with several Grignard reagents. Allyl magnesium halides have proven particularly effective.