Trimethylgermylation and trimethylsilylation of N,N-dialkylacetamides and application of their anions to the Peterson-type reaction
作者:Shin'ichi Urayama、Sumie Inoue、Yoshiro Sato
DOI:10.1016/0022-328x(88)87041-4
日期:1988.10
trimethylgermylation of N,N-dimethylacetamide (1a) or 1-acetylpiperidine (1b) were carried out. The germylgroup was introduced stepwise onto the methyl carbon of the acetyl group to give mono- (3), bis- (6), or tris(trimethylgermyl)acetamides (9b), respectively, in high yields, whereas under similar conditions the second silylgroup was usually introduced at the carbonyl-oxygen. The Peterson-type reaction of N,N-d
N-Heterocyclic carbene mediated Reformatsky reaction of aldehydes with α-trimethylsilylcarbonyl compounds
作者:Xiao-Lei Zou、Guang-Fen Du、Wan-Fu Sun、Lin He、Xiao-Wei Ma、Cheng-Zhi Gu、Bin Dai
DOI:10.1016/j.tet.2012.11.015
日期:2013.1
N-Heterocycliccarbenes have been employed as highly efficient organocatalysts to mediate silyl-Reformatsky type reaction. In the presence of only 0.5 mol % nucleophiliccarbene 1, various aldehydes coupled with α-trimethylsilylethylacetate very smoothly in DMF at room temperature to provide the corresponding β-hydroxyesters in moderate to high yields. α-Trimethylsilylketone and α-trimethylsilylamide
Application of the Brook Rearrangement in Tandem with Single Electron Transfer Oxidative and Radical Processes
作者:Mikhail K. Klychnikov、Radek Pohl、Ivana Císařová、Ullrich Jahn
DOI:10.1002/ejoc.202000126
日期:2020.5.22
Rearrangement and radical puzzle: Chiral epoxides, silylated acetamides, and stable radical TEMPO provide, with the help of ferrocenium hexafluorophosphate, dioxygenated carbonylcompounds, which serve as versatile radical cyclization precursors.
Deprotonation of β,β-disubstituted α,β-unsaturated amides - Mechanism and stereochemical consequences
作者:James R Green、Marek Majewski、Victor Snieckus
DOI:10.1139/v06-112
日期:2006.10.1
detailed study of the lithium dialkylamide induced deprotonation of β,β-disubstituted α,β-unsaturated amides is presented. The preferential γ-Z-deprotonation and stereochemical outcome of substituents on the γ-Z carbon atom are rationalized in terms of a cyclic eight-membered transition state, which is supported by DFT calculations. Analogous deprotonations on cyclohexylidenecarboxamides reveal a delicate