Copper-Catalyzed Oxidative Cleavage of Electron-Rich Olefins in Water at Room Temperature
作者:Daniel J. Lippincott、Pedro J. Trejo-Soto、Fabrice Gallou、Bruce H. Lipshutz
DOI:10.1021/acs.orglett.8b01883
日期:2018.9.7
of electron-rich olefins into their corresponding carbonyl derivatives is described as an alternative to ozonolysis. The scope includes various precursors to arylketone derivatives, as well as oxidations of enol ethers bearing atypical alkyl and dialkyl substitution, the first of their kind among such metal catalyzed alkene cleavage reactions. The use of an inexpensive copper salt, room temperature
Catalytic Asymmetric Reductive Amination of Aldehydes via Dynamic Kinetic Resolution
作者:Sebastian Hoffmann、Marcello Nicoletti、Benjamin List
DOI:10.1021/ja065404r
日期:2006.10.1
A novel organocatalytic asymmetric reductive amination of aldehydes has been developed. Treating racemic alpha-branched aldehydes with p-anisidine and a Hantzsch ester in the presence of our previously developed phosphoric acid catalyst, TRIP, gave beta-branched secondary amines in excellent yields and enantioselectivities via an efficient dynamic kinetic resolution. The process is applicable to several
Supported Au nanoparticles on TiO2 catalyze the unprecedented dehydrogenative disilylation of monosubstituted and 1,1‐disubstituted allenes by Et2SiH2 exclusively on the terminal double bond in a stereoselective manner. Treatment of the disilylation products with H2O, in a one‐pot operation also catalyzed by Au/TiO2, leads to 3‐alkylidene‐1,2,5‐oxadisilolanes, an unknown class of heterocyclic compounds
在TiO支持的Au纳米颗粒2催化单取代和1,1-二取代的丙二烯的前所未有脱氢disilylation通过的Et 2的SiH 2只在以立体选择性方式的末端双键。在同样由Au / TiO 2催化的一锅操作中,用H 2 O处理二烯丙基化产物会生成3-亚烷基-1,2,5-恶二硅环酮,这是一类未知的杂环化合物,是出色的支架Hiyama型交叉偶联条件下烯烃的立体选择性合成。
Synthesis of 2-arylacrylic esters from aryl methyl ketones via Wittig reaction/singlet oxygen ene reaction
has been developed for the synthesis of 2-arylacrylic esters from the corresponding aryl methyl ketones via Wittig reaction and singletoxygenenereaction. Wittig reaction to aryl methyl ketones with (methoxymethyl)triphenylphosphonium chloride in basic condition afforded the methyl enol ethers, and then 2-arylacrylic esters were obtained by singletoxygenenereaction, followed by tosylation and
Upon UV-irradiation of alken-1-yl aryl methyl phosphates in methanol a cationic migration of an aryl group to a neighbouring olefinic moiety to produce arylalkanone and arylalken-1-yl methyl ether has been observed.