Synthesis of 3-aryl-5,7-dinitrothiochromane 1,1-dioxides based on 2,4,6-trinitrotoluene
摘要:
3-Aryl-5,7-dinitrothiochromane 1,1-dioxides are formed by the condensation of methyl (2-methyl-3,5-dinitrobenzenesulfonyl)acetate and ethyl (2-methyl-3,5-dinitrobenzenesulfonyl)propionate, which are the products of 2,4,6-trinitrotoluene transformations, with aromatic aldehydes under conditions of the Knoevenagel reaction.
The reactions of 2,4,6-trinitrotoluene with alkanethiols in the presence of K(2)CO(3) (the molar ratio of the reactants is 1 : 1 : 1) in dipolar aprotic solvents result in selective replacement of the ortho-nitro group to form 2-alkylthio-4,6-dinitrotoluenes, which can be oxidized to the corresponding sulfoxides or sulfones. The second ortho-nitro group can be replaced under the action of one more equivalent of alkanethiol oil sulfides as exemplified in PhCH(2)SH.
作者:V. A. Tartakovskii、S. A. Shevelev、M. D. Dutov、O. V. Serushkina、V. V. Kachala
DOI:10.1023/a:1025597816012
日期:——
Treatment of 2,4,6-trinitrotoluene with beta-mercaptocarboxylic acid esters and subsequent oxidation gave 2-(alkoxycarbonyl-R-methylsulfonyl)-4-X-6-nitrotoluenes which were brought into Knoevenagel condensation with aromatic aldehydes (heating in benzene in the presence of secondary amine acetates). As a result of intramolecular cyclization, 2-alkoxycarbonyl-3-aryl-2-R-5-X-7-nitrothiochroman 1,1-dioxides (R = H, Me; X = NO2, R'SO2) were obtained. The developed procedure opens the way to hitherto unknown thiochroman 1,1-dioxide derivatives.