Distal γ‐C(sp
<sup>3</sup>
)−H Olefination of Ketone Derivatives and Free Carboxylic Acids
作者:Han Seul Park、Zhoulong Fan、Ru‐Yi Zhu、Jin‐Quan Yu
DOI:10.1002/anie.202003271
日期:2020.7.27
Reported herein is the distal γ‐C(sp3)−H olefination of ketone derivatives and free carboxylic acids. Fine tuning of a previously reported imino‐acid directing group and using the ligand combination of a mono‐N‐protected amino acid (MPAA) and an electron‐deficient2‐pyridone were critical for the γ‐C(sp3)−H olefination of ketone substrates. In addition, MPAAs enabled the γ‐C(sp3)−H olefination of free carboxylic
Ligand-Enabled γ-C(sp<sup>3</sup>)–H Activation of Ketones
作者:Ru-Yi Zhu、Zi-Qi Li、Han Seul Park、Chris H. Senanayake、Jin-Quan Yu
DOI:10.1021/jacs.8b01359
日期:2018.3.14
are identified to enable C(sp3)-H activation for the first time. A rare six-membered palladacycle intermediate is isolated and characterized to elucidate the reaction mechanism. Both (hetero)arylation and vinylation of γ-C(sp3)-H bonds are demonstrated. Sequential β- and γ-C(sp3)-H (hetero)arylation of muscone showcases the utility of this method for late-stagediversification. A convenient Mn(II)-catalyzed
We present a general protocol for the formal Michael addition of acetone to alpha,beta-unsaturated esters and amides, a transformation difficult to perform using current methods. The protocol comprises of an amidine catalyzed relay ring-opening and fragmentation of 3,4-dihydropyranones. The reaction proceeds under mild conditions, has a broad substrate scope and the products can be isolated in good
Verfahren zur Herstellung von 3,3-Dimethylglutarsäure oder deren Ester
申请人:LONZA AG
公开号:EP0065706A1
公开(公告)日:1982-12-01
3,3-Dimethylglutarsäure wird aus Dimedon, welches nicht isoliert aus der Umsetzung von Isophoron über den 3,3-Dimethyl-5-oxo-hexansäuremethylester stammt, durch Ozonanlagerung und nachfolgender Hydrolyse erhalten.
Dimedon wird aus Isophoron, über dessen Ozonanlagerungsprodukt, dem daraus hergestellten 3,3-Dimethyl-5-oxo- hexansäureester und nach Behandlung des letzteren mit einer stöchiometrischen Menge eines Natriumalkoholates erhalten.