Direct measurement of the rates of reketonization of dienolates produced by photochemical enolization of .beta.-alkyl .alpha.,.beta.-unsaturated ketones in aqueous basic solution
Acyldemetallation of titanium(III) π-allylic complexes
作者:A.N. Kasatkin、A.N. Kulak、G.A. Tolstikov
DOI:10.1016/0022-328x(88)87004-9
日期:1988.5
Titanium(III) π-allyliccomplexes, prepared by the interaction of 1,3-dienes or trienes with Cp2TiCl2 and n-PrMgBr, react with carboxylic acid chlorides RCOCl (R = alkyl, aryl, alkenyl) to give β, γ-unsaturated ketones in high yields. The reaction takes place at the most substituted carbon atom of the π-allylic ligand.
ZrCp2(isoprene) reacts with aliphatic aldehydes, ketones or nitriles regioselectively on C1-carbon of the isoprene moiety to give novel 2-oxa- or 2-aza-metallacycles which release alcohols or ketones respectively on hydrolysis. In contrast, ZrCH3(η1-methylallyl)Cp2, Ti(η3-methylallyl)Cp2, and [MgCH2C(CH3)=CHCH2]n reacted with acetone on the C3-carbon of the methylallyl or the isoprene unit.
Produits à odeur de violette. 52e communication. Synthèse de la triméthyl-1,1,6-cyclohexanone-3
作者:H. Favre、H. Schinz
DOI:10.1002/hlca.19520350726
日期:1952.12.1
Nous avons réalisé lasynthèsedela triméthyl-1,1, 6-cyclohexanone-3, dont la semicarbazone s'est révélée identique à celle dela triméthyl-1,1, 6-cyclohexanone-33), isolée des produitsde dégradation de l'irone naturelle.
Tandem Nucleophilic Addition/Oxy-2-azonia-Cope Rearrangement for the Formation of Homoallylic Amides and Lactams: Total Synthesis and Structural Verification of Motuporamine G
作者:Lijun Zhou、Zhiming Li、Yue Zou、Quanrui Wang、Italo A. Sanhueza、Franziska Schoenebeck、Andreas Goeke
DOI:10.1021/ja310002m
日期:2012.12.12
oxy-2-azonia-Cope rearrangements give homoallylic amides. In the case of 2-vinylcycloalkanones, the process results in ring enlargement, providing a novel route to 9- to 16-membered lactams. The preparative significance of this protocol was evidenced by a short synthesis of macrocyclic alkaloid motuporamine G. The stereochemistry-defining step of this oxy-azonia-Cope rearrangement was further studied
A general method to synthesize functionalized allyl α-amino acid derivatives through an irreversible oxy-2-azonia-Cope rearrangement is reported. In the presence of AlCl3, the reaction of imino ethyl glyoxalates with various β,γ-unsaturated ketones furnished the corresponding allyl α-amino acid derivatives. The key to the success of this method is the amide bond formation, which makes the rearrangement