A 4-Dimethylaminopyridine-Catalyzed Aminolysis of β-Ketoesters. Formation of β-Ketoamides
作者:Janine Cossy、Annie Thellend
DOI:10.1055/s-1989-27383
日期:——
Alkyl 3-oxoalkanoates (ß-ketoesters) react with amines in the presence of a catalytic amount of 4-dimethylaminopyridine (DMAP) under mild conditions to form 3-oxoalkanamides (ß-ketoamides) in good yields.
Dynamic Kinetic Sensitization of β‐Dicarbonyl Compounds—Access to Medium‐Sized Rings by De Mayo‐Type Ring Expansion
作者:Tiffany O. Paulisch、Lukas A. Mai、Felix Strieth‐Kalthoff、Michael J. James、Christian Henkel、Dirk M. Guldi、Frank Glorius
DOI:10.1002/anie.202112695
日期:2022.1.26
A photocatalyzed ring expansion procedure for a two-carbon homologation of cyclic carbonyl compounds, towards medium-sized ring systems, is introduced. Key to success is the catalyst fac-[Ir(CF3-pmb)3] (ET=73.3 kcal mol−1), which allows for selective activation of the substoichiometric enol species. The mechanism has been corroborated by time-resolved spectroscopy and enabled a full kinetic analysis
介绍了一种光催化扩环过程,用于环状羰基化合物的双碳同系化,朝向中型环系统。成功的关键是催化剂fac -[Ir(CF 3 -pmb) 3 ] ( E T =73.3 kcal mol -1 ),它允许选择性活化亚化学计量的烯醇物质。该机制已被时间分辨光谱证实,并能够对动态动力学敏化情景进行全面的动力学分析。
Dehydrogenations with lead tetraacetate. Ketone to enone transformations in the 2-(aminocarbonyl)- and 2-(carbalkoxy)cycloalkanone series
作者:Arthur G. Schultz、Mark A. Holoboski
DOI:10.1016/s0040-4039(00)93368-9
日期:1993.5
Cyclic beta-ketoesters and beta-ketoamides are converted to 2-(carbalkoxy)- and 2-(aminocarbonyl)-2-cycloalken-1-ones by treatment with Pb(OAc)4 and Cu(OAc)2 in benzene.
LABELLE, M.;GRAVEL, D., J. CHEM. SOC. CHEM. COMMUN., 1985, N 3, 105-106