It′s the iodine: The intra‐ and intermolecular title reaction is catalyzed by an in situgenerated ammonium (hypo)iodite species. Either H2O2 or tert‐butyl hydroperoxide (TBHP) can be used as an environmentally benign oxidant and a wide range of substrates react to give the corresponding α‐acyloxycarbonyl compounds in good to excellent yields.
它是碘:分子内和分子间标题反应是由原位生成的亚碘铵(次同)催化的。H 2 O 2或叔丁基氢过氧化物(TBHP)都可以用作环境友好的氧化剂,并且多种底物反应生成相应的α-酰氧基羰基化合物,收率良好至优异。
METHOD FOR PRODUCING ALPHA-ACYLOXYCARBONYL COMPOUND AND NOVEL ALPHA-ACYLOXYCARBONYL COMPOUND
申请人:Ishihara Kazuaki
公开号:US20120323014A1
公开(公告)日:2012-12-20
A method for producing an α-acyloxycarbonyl compound of the present invention includes performing an intermolecular reaction between a carboxylic acid and a carbonyl compound selected from the group consisting of ketones, aldehydes, and esters, which have a hydrogen atom at the α-position, using a hydroperoxide as an oxidizer and an iodide salt as a catalyst precursor, thereby introducing an acyloxy group derived from the carboxylic acid into the α-position of the carbonyl compound.
The first synthesis of threo and erythro (E)-4,5-dihydroxydec-2-enals, aldehydes related to the lipid peroxidation is accomplished by reaction of α-benzoyloxheptanal with the Grignard reagent of 3,3-diethoxy-1-propyne and lithiumaluminumhydride reduction. Acetonization of the diol system allows a simple chromatographic separation of the diastereoisomers, the geometry of which was established by 1H
苏-和赤(E)-4,5-二羟基癸-2-烯醛(与脂质过氧化有关的醛)的首次合成是通过α-苯甲酰氧基庚醛与3,3-二乙氧基-1-丙炔的格利雅试剂和氢化铝锂还原。二醇体系的丙酮化可以简单地色谱分离非对映异构体,其几何结构通过1 H和13 C NMR实验确定,并通过(E,4R,5R)-4,5-O-的独立合成得到证实D-甘露糖醇的异亚丙基-4,5-二羟基癸-2-烯醛。
METHOD FOR PRODUCING A-ACYLOXYCARBONYL COMPOUND AND NOVEL A-ACYLOXYCARBONYL COMPOUND
申请人:National University Corporation Nagoya University
公开号:EP2543658A1
公开(公告)日:2013-01-09
A method for producing an α-acyloxycarbonyl compound of the present invention includes performing an intermolecular reaction between a carboxylic acid and a carbonyl compound selected from the group consisting of ketones, aldehydes, and esters, which have a hydrogen atom at the α-position, using a hydroperoxide as an oxidizer and an iodide salt as a catalyst precursor, thereby introducing an acyloxy group derived from the carboxylic acid into the α-position of the carbonyl compound.
Manganese-Catalyzed 5-Endo-trig Oxygenative Cyclization of α,β-Unsaturated Oximes under Air and Ambient Conditions for the Synthesis of 4,5-Dihydroisoxazoles
The stereoselective 5-endo-trig oxygenativecyclization of α,β-unsaturatedoximes was achieved using molecular oxygen (O2) and a manganese catalyst. Several 4-hydroxy-4,5-dihydroisoxazoles were obtained in high yields by directly incorporating O2 from the atmosphere (eliminating the necessity for a pure oxygen environment) and using an unprecedentedly low loading of Mn(acac)3 (as little as 0.020 mol