Anaerobic Nitroxide-Catalyzed Oxidation of Alcohols Using the NO<sup>+</sup>/NO· Redox Pair
作者:Martin Holan、Ullrich Jahn
DOI:10.1021/ol403016p
日期:2014.1.3
A newmethod for alcoholoxidationusing TEMPO or AZADO in conjunction with BF3·OEt2 or LiBF4 as precatalysts and tert-butyl nitrite as a stoichiometric oxidant has been developed. The system is based on a NO+/NO· pair for nitroxide reoxidation under anaerobic conditions. This allows the simple, high-yielding conversion of various achiral and chiral alcohols to carbonyl compounds without epimerization
Asymmetric Schmidt Reaction of Hydroxyalkyl Azides with Ketones
作者:Kiran Sahasrabudhe、Vijaya Gracias、Kelly Furness、Brenton T. Smith、Christopher E. Katz、D. Srinivasa Reddy、Jeffrey Aubé
DOI:10.1021/ja0348896
日期:2003.7.1
asymmetric equivalent of the Schmidtreaction permits stereocontrol in ring expansions of symmetrical cyclohexanones. The procedure involves the reaction of chiral 1,2- and 1,3-hydroxyalkyl azides with ketones under acid catalysis; the initial reaction affords an iminium ether that can be subsequently opened with base. A systematic study of this reaction is reported, in which ketone substrates, chiral hydroxyalkyl
[EN] NOVEL SPIRO IMIDAZOLONES AS GLUCAGON RECEPTOR ANTAGONISTS, COMPOSITIONS, AND METHODS FOR THEIR USE<br/>[FR] NOUVELLES SPIRO-IMIDAZOLONES EN TANT QU'ANTAGONISTES DE RÉCEPTEUR DE GLUCAGON, COMPOSITIONS ET LEURS PROCÉDÉS D'UTILISATION
申请人:SCHERING CORP
公开号:WO2011119559A1
公开(公告)日:2011-09-29
The present invention relates to compounds of the general formula: wherein ring A, ring B, R1, R3, Z, L1, and L2 are selected independently of each other and are as defined herein, to compositions comprising the compounds, and to methods of using the compounds as glucagon receptor antagonists and for the treatment or prevention of type 2 diabetes and conditions related thereto.
Palladium-Catalyzed Intramolecular Hydroalkylation of Alkenyl- ?-Keto Esters, ?-Aryl Ketones, and Alkyl Ketones in the Presence of Me3SiCl or HCl
作者:Xiaoqing Han、Xiang Wang、Tao Pei、Ross A. Widenhoefer
DOI:10.1002/chem.200400459
日期:2004.12.17
palladium-catalyzed hydroalkylation, but rather served as a source of HCl, which presumably catalyzes enolization of the ketone. Identification of HCl as the active promoter of palladium-catalyzed hydroalkylation led to the development of an effective protocol for the hydroalkylation of alkyl 3-butenyl ketones that employed sub-stoichiometric amounts of 2, HCl, and CuCl2 in a sealed tube at 70 degrees C.
A steric tethering approach enables palladium-catalysed C–H activation of primary amino alcohols
作者:Jonas Calleja、Daniel Pla、Timothy W. Gorman、Victoriano Domingo、Benjamin Haffemayer、Matthew J. Gaunt
DOI:10.1038/nchem.2367
日期:2015.12
higher-order nitrogen-containing molecules, commonly found in biologically active compounds and pharmaceutical agents. New methods for the construction of complex amines remain a continuous challenge to synthetic chemists. Here, we outline a general palladium-catalysed strategy for the functionalization of aliphatic C–H bonds within amino alcohols, an important class of smallmolecule. Central to this strategy