Commerciallyavailable and inexpensive magnesium monoperphthalate (MMPP) was found to be an effective oxidant for the first direct Rubottom hydroxylation of α‐substituted malonates, β‐ketoesters, and β‐ketoamides, when working in ethanol at room temperature and using NaHCO3 as basic additive. The feasibility of gram scale oxidation was also demonstrated.
A Phosphetane Catalyzes Deoxygenative Condensation of α-Keto Esters and Carboxylic Acids via P<sup>III</sup>/P<sup>V</sup>═O Redox Cycling
作者:Wei Zhao、Patrick K. Yan、Alexander T. Radosevich
DOI:10.1021/ja511889y
日期:2015.1.21
A small-ring phosphacycle is found to catalyze the deoxygenative condensation of α-keto esters and carboxylic acids. The reaction provides a chemoselective catalytic synthesis of α-acyloxy ester products with good functional group compatibility. Based on both stoichiometric and catalytic mechanistic experiments, the reaction is proposed to proceed via catalytic P(III)/P(V)═O cycling. The importance
A Biomimetic Iron Catalyst for the Epoxidation of Olefins with Molecular Oxygen at Room Temperature
作者:Kristin Schröder、Benoît Join、Arlin Jose Amali、Kathrin Junge、Xavi Ribas、Miquel Costas、Matthias Beller
DOI:10.1002/anie.201004623
日期:2011.2.7
It's no sacrifice: A bio‐inspired iron system, in which a β‐keto ester serves as a sacrificial cosubstrate, readily epoxidizes olefins under ambient conditions with air. Aromatic olefins are oxidized in high yields with excellent chemoselectivity. Mechanistic investigations point out substantial differences to well‐known radical‐based autoxidations.
Synthesis of α-Nitro Carbonyls via Nitrations in Flow
作者:Anna Chentsova、Dmitry B. Ushakov、Peter H. Seeberger、Kerry Gilmore
DOI:10.1021/acs.joc.6b01634
日期:2016.10.7
α-nitro esters via the trapping of nitronium ions. The two-stage nitration and subsequent deacetylation of readily available 1,3-dicarbonyl compounds was achieved using a biphasic semicontinuous approach. α-Nitro esters and amides were obtained in good overall yields (53–84%). Some of the α-nitro-1,3-dicarbonyl intermediates exhibit enhanced reactivity and undergo an acid-catalyzed Nef-type reaction to