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
α-羟基膦酸及其衍生物是具有高生物活性的结构基序。据报道,这些化合物可通过原位生成的亚硝基羰基化合物作为亲电子氧源,通过铜催化的β-酮膦酸酯的直接α-氧化而获得。对于环状和非环状底物,这些反应均以高产率(最高95%)和对映选择性(最高> 99%ee)进行。该方法还用于合成α,β-二羟基膦酸酯和β-氨基-α-羟基膦酸酯。