3-(4 OR 3-Pyridinyl)-2-cyclohexen-1-ones (I) and their oxime derivatives are useful in preparing (3-aminophenyl)-pyridines, in turn, useful in preparing known antibacterial agents. Also shown is the preparation of I by starting with the reaction of methyl vinyl ketone with either 1-(pyridinyl)-1-(lower-tertiary-amino)-ethylene (II) or lower-alkyl 3-(pyridinyl)-3-oxopropanoate. Also shown is the process of converting I to its oxime, acylating the oxime and heating the acylated oxime under acidic conditions to produce N-(lower-acyl)-3-(pyridinyl)-aniline (VII), and hydrolyzing VII under aqueous alkaline conditions to produce the corresponding 3-(pyridinyl)aniline.
N-sulfonylamidines. Part III. A new rearrangement reaction of N-alkylsulfonyl-amidines: Synthesis of enamines, β-aminosulfonyl-enamines and 4H-thiazete-S,S-dioxides.
作者:Francesca Clerici、Donato Pocar、Antonella Rozzi
DOI:10.1016/s0040-4020(01)96105-8
日期:1991.3
N-alkylsulfonylamidines (1) ( a newclass of amidines) rearrange by intramolecular attack of the carbanion generated α to the SO2 group on the amidine carbon. Through a cyclic thiazetidine intermediate three main classes of compounds are formed, i.e. enamines (), β-aminosulfonylenamines () and 4H-thiazete-S,S-dioxides (). In the rearrangement products and the two carbon moieties of the amidine formerly linked to