Reactions of 1,2‐dihydro‐4
<i>H</i>
‐3,1‐benzothiazine‐2,4‐dithiones (trithioisatoic anhydrides) with
<i>N</i>
‐substituted benzylamines and trialkyl phosphites
作者:Masahiko Takahashi、Tomoko Gunji、Akiko Ichikawa
DOI:10.1002/jhet.5570390527
日期:2002.9
Reactions of 1,2-dihydro-4H-3,1-benzothiazine-2,4-dithiones (trithioisatoic anhydrides) 3 with N-substi-tuted benzylamines 9 gave 1,2-dihydroquinazoline-4-thiones 10, o-thioureidodithiobenzoic acid 11, o-aminothiobenzamides 12, 2-amino-3,1-benzothiazine-4-thiones 13, or quinazoline-2,4-dithiones 14, depending on the kinds of amine and the reaction solvent. On the other hand, reaction of 3 with trialkyl
1,2-二氢-4 H -3,1-苯并噻嗪-2,4-二硫酮(三硫代脲酸酐)3与N-取代的苄胺9的反应得到1,2-二氢喹唑啉-4-硫酮10,邻硫脲二硫代苯甲酸酯酸11,直径: -aminothiobenzamides 12,2-氨基-3,1-苯并噻嗪-4-硫酮13,或喹唑啉-2,4- dithiones 14,这取决于种胺和反应溶剂。另一方面,3与亚磷酸三烷基酯的反应得到二烷基(1,2-二氢-2-thioxo-4 H -3,1-苯并噻嗪-4-基)膦酸酯18。
AbstractThe electrochemical reduction of isatoic anhydride and its derivatives was studied by simultaneous electrochemical and ESR‐measurements. For the first time 9 new radicals were characterized by its formal redox potentials, hyperfine coupling constants, g‐factors and lifetimes. The advantage of measuring the kinetic data in stagnant and renewed electrolyte combined with accumulation of the ESR‐spectra is demonstrated in the case of shortlived radicals. It is shown that the electrochemical reduction of isatoic structures follows a self protonation mechanism.
LEISTNER S.; WAGNER G., Z. CHEM., 1980, 20, NO 5, 187-188