Cycloaddition of aziridine with carbon dioxide was successfully catalyzed by alkali metal halide or tetraalkylammonium halide to give the corresponding 5-membered cyclic urethane, 1,3-oxazolidin-2-one, selectively. The reaction can be performed at ambient temperature under atmospheric pressure. Analoguous reaction of aziridine with carbon disulfide also successfully gave the corresponding 5-membered
Investigations on Pantothenic Acid and Its Related Compounds. XIII. Chemical Studies. (6). Syntheses of Homopantethine and Some Other Pantethine Analogs
作者:OSAMU NAGASE、HIROAKI TAGAWA、MASAO SHIMIZU
DOI:10.1248/cpb.16.977
日期:——
Four pantethine analogs (homopantethine (VII), α-methyl-(XIIIb) and β-methyl-pantethine (XIIIc), and oxypantetheine (XVI)) were prepared. Synthesis of VII from D-pantothenonitrile (I) and homocysteamine by using the thiazine derivative (III) as an intermediate was established. XIIIb and XIIIc were synthesized by the thiazoline method described previously, and XVI by the general method.
Synthesis of the Anti-HIV Agent (−)-Hyperolactone C by Using Oxonium Ylide Formation-Rearrangement
作者:David M. Hodgson、Stanislav Man
DOI:10.1002/chem.201101082
日期:2011.8.22
Starting from readily available (S)‐styrene oxide an asymmetric synthesis is described of the naturally occurring anti‐HIV spirolactone (−)‐hyperolactoneC, which possesses adjacent fully substituted stereocenters. The key step involves a stereocontrolled RhII‐catalysed oxonium ylide formation–[2,3] sigmatropic rearrangement of an α‐diazo‐β‐ketoester bearing allylic ether functionality. From the resulting
[EN] NEMATICIDAL THIAZOLINE-CONTAINING FLUOROBUTENES<br/>[FR] FLUOROBUTENES NEMATICIDES CONTENANT DE LA THIAZOLINE
申请人:BAYER CROPSCIENCE AG
公开号:WO2005003107A1
公开(公告)日:2005-01-13
The present invention relates to novel thiazoline-containing fluorobutenes of the formula (I) wherein R represents methyl or ethyl, and X represents hydrogen or fluoro, to a process for their preparation and to their use as nematicides.