Asymmetric hydrogenation of 3,5-Dioxoesters catalyzed by Ru-binap complex: A short step asymmetric synthesis of 6-substituted 5,6-dihydro-2-pyrones
摘要:
Asymmetric hydrogenation of 3,5-dioxoesters 1a-c using Ru2Cl4((R) or (S)-binap)2(NEt3) as the catalyst gave dominantly anti 3,5-dihydroxyesters 2, which were then converted into unsaturated lactones 5a-b (ca. 80% e.e.). The pathway of the hydrogenation reaction was also investigated by asymmetric hydrogenation of (R)- or (S)-5-hydroxy-3-oxoesters 8a-c. It was revealed that the Ru-binap catalyzed hydrogenation of 1a-b proceed dominantly via the beta-diketone mode. A convenient asymmetric synthesis of hydroxylactone 3c and unsaturated lactone 5c was presented.
A method for the successful acylation of the dianion of simple β-ketoesters to yield β,δ-diketo esters has been developed. The dianion of methyl acetoacetate also reacts with the monoanion of meth...
PYRIDAZINE AMIDE COMPOUNDS AND THEIR USE AS SYK INHIBITORS
申请人:F. Hoffmann-La Roche AG
公开号:EP2802567B1
公开(公告)日:2017-03-01
[EN] PYRIDAZINE AMIDE COMPOUNDS AND THEIR USE AS SYK INHIBITORS<br/>[FR] COMPOSÉS DE PYRIDAZINAMIDE ET LEUR UTILISATION EN TANT QU'INHIBITEURS DE SYK
申请人:HOFFMANN LA ROCHE
公开号:WO2013104573A1
公开(公告)日:2013-07-18
The present invention relates to the use of novel triazolopyridine derivatives of formula (I): wherein all variable substituents are defined as described herein, which are SYK inhibitors and are useful for the treatment of auto-immune and inflammatory diseases.
Asymmetric hydrogenation of 3,5-Dioxoesters catalyzed by Ru-binap complex: A short step asymmetric synthesis of 6-substituted 5,6-dihydro-2-pyrones
Asymmetric hydrogenation of 3,5-dioxoesters 1a-c using Ru2Cl4((R) or (S)-binap)2(NEt3) as the catalyst gave dominantly anti 3,5-dihydroxyesters 2, which were then converted into unsaturated lactones 5a-b (ca. 80% e.e.). The pathway of the hydrogenation reaction was also investigated by asymmetric hydrogenation of (R)- or (S)-5-hydroxy-3-oxoesters 8a-c. It was revealed that the Ru-binap catalyzed hydrogenation of 1a-b proceed dominantly via the beta-diketone mode. A convenient asymmetric synthesis of hydroxylactone 3c and unsaturated lactone 5c was presented.
Synthesis of 1,3,5-Tricarbonyl Derivatives by Condensation of 1,3-Bis(silyl enol ethers) with Acid Chlorides
作者:Thomas Rahn、Van T. H. Nguyen、T. H. Tam Dang、Zafar Ahmed、Karen Methling、Michael Lalk、Christine Fischer、Anke Spannenberg、Peter Langer
DOI:10.1021/jo062153w
日期:2007.3.1
A variety of 1,3,5-tricarbonyl derivatives were prepared by reaction of 1,3-bis(silyl enol ethers) with acidchlorides under mild conditions. This includes reactions of both aromatic and aliphatic acidchlorides and bis(acidchlorides). The yields vary depending on the type of acidchloride employed.