Synthesis of 2-Phosphonopyrroles via a One-Pot RCM/Oxidation Sequence
作者:Kristof Moonen、Nicolai Dieltiens、Christian V. Stevens
DOI:10.1021/jo060160e
日期:2006.5.1
A four-step synthesis of 2-phosphonopyrroles is presented starting from suitable aldehydes. The key step in the synthesis involves a one-potring-closingmetathesis/oxidation sequence of a functionalized α-aminoalkenyl phosphonate. Notwithstanding the presence of a nucleophilic nitrogen atom and high substitution patterns in the substrate, the results of the RCM reaction are excellent using mild reaction
Development of an Anomalous Heck Reaction: Skeletal Rearrangement of Divinyl and Enyne Carbinols
作者:J. Maina Ndungu、Kimberly K. Larson、Richmond Sarpong
DOI:10.1021/ol052382p
日期:2005.12.1
[reaction: see text] A general set of conditions that achieves the union of aryl halides and divinyl or enyne carbinols to afford tri- or tetrasubstituted olefins in good yields (up to 83%) is described. The mechanism by which this proceeds is believed to involve the intermediacy of a cyclopropanol, followed by a novel skeletal reorganization. The ability to suppress beta-hydride elimination of organopalladium
Silylformylation–desilylation of propargyl amides: synthesis of α,β-unsaturated aldehydes
作者:Laura Antonella Aronica、Patrizio Raffa、Giulia Valentini、Anna Maria Caporusso、Piero Salvadori
DOI:10.1016/j.tetlet.2005.11.054
日期:2006.1
α,β-Unsaturated aldehydes are prepared from easily available propargyl amides through a two-step sequence of silylformylation–desilylation reactions. The substituent on the nitrogen atom markedly influences both reactions, β-silylalkenals being formed in the presence of tosyl or tert-butoxycarbonyl protected amines. TBAF is employed to induce the desilylation process that is performed under very mild
Process for preparing pyridine-2,3-dicarboxylic acid compounds
申请人:SUGAI CHEMICAL INDUSTRY CO., LTD.
公开号:EP0274379A2
公开(公告)日:1988-07-13
A process for preparing pyridine-2,3-dicarboxylic acid compounds of the following formula:
wherein R¹ and R³ are, identical or different, each a hydrogen atom or a lower alkyl group, R² is a hydrogen atom, a lower alkyl group, or a phenyl-(lower)alkyl group which may have halogen atom or lower alkyl group on its phenyl ring, and R⁴ and R⁵ are, identical or different, each a lower alkoxy group.
The compounds are useful as an intermediate for preparing agricultural chemicals and pharmaceuticals.
METAL MATERIAL WITH A BISMUTH FILM ATTACHED AND METHOD FOR PRODUCING SAME, SURFACE TREATMENT LIQUID USED IN SAID METHOD, AND CATIONIC ELECTRODEPOSITION COATED METAL MATERIAL AND METHOD FOR PRODUCING SAME
申请人:NIHON PARKERIZING CO., LTD.
公开号:EP2280096A1
公开(公告)日:2011-02-02
This invention provides a metal material with a bismuth coating being enables the subsequent coating to be accomplished at a high throwing power, and has excellent corrosion resistance, coating adhesion, and, being able to be produced with reduced damage to the environment, the metal material having a surface and a bismuth-containing layer deposited on at least a part of the surface of the metal material, wherein a percentage of bismuth atoms in number of atoms in the surface layer of the metal material with a bismuth coating is at least 10%.