One-Pot DBU-Promoted Synthesis of Hydroacridinones and Spirohexahydropyrimidines
摘要:
The potential hydroacridinone synthesis using simple and inexpensive starting materials, namely 1,3-dicarbonyl compounds, anilines, formaldehyde and DBU as a stoichiometric base was explored. As a result, from the reaction of 1,3-cyclohexanedione and dimedone tetrahydroacridinones were the main reaction products along with small yields of their oxidation products, the dihydroacridinones, whereas in the case of 2-acetylcyclohexanone spirohexahydropyrimidines were isolated in very good yields. Plausible mechanistic schemes for the formation of all products are proposed.
Ketones and aryl or vinyl halides couple to give divinyl- or arylvinylamines in the presence of the titanium-isocyanate complex [3 THF.Mg2Cl2O.TiNCO] (1) and a palladium catalyst, via transmetallation of the titano imine complex (3) with aryl- or vinylpalladium bromide.
UOZUMI, YASUHIRO;MORI, MIWAKO;SHIBASAKI, MASAKATAU, J. CHEM. SOC. CHEM. COMMUN.,(1991) N, C. 81-83