New syntheses of aryl isothiocyanates from N-arylimino-1,2,3-dithiazoles
作者:Thierry Besson、Jérôme Guillard、Charles W. Rees、Michel Thérisod
DOI:10.1039/a700551b
日期:——
Treatment of N-arylimino-1,2,3-dithiazoles 2 with
ethylmagnesium bromide (2 equiv.) gives the corresponding aryl
isothiocyanates 13, providing a very mild two-step conversion of
ArNH
2
into ArNCS avoiding hazardous reagents; alternatively the
iminodithiazoles 2 can be converted into cyanothioformanilides 11 which
rapidly give the same isothiocyanates with 1 equiv. of the Grignard
reagent.
Novel benzothiazole derivatives have been synthesised via the corresponding imino-1,2,3-dithiazoles. The cytotoxicity of some of these polyheterocyclic compounds was studied. Our results show that 2-cyano derivatives exhibit a medium in vitro antitumour activity. (C) 1999 Editions scientifiques et medicales Elsevier SAS.
Antimicrobial evaluation of 3,1-benzoxazin-4-ones, 3,1-benzothiazin-4-ones, 4-alkoxyquinazolin-2-carbonitriles and N-arylimino-1,2,3-dithiazoles
作者:Thierry Besson、Charles W. Rees、Gilles Cottenceau、Anne-Marie Pons
DOI:10.1016/0960-894x(96)00423-4
日期:1996.10
Novel 3,1-benzoxazinones, 3,1-benzothiazinones and 4-alkoxyquinazolines have been synthesized via N-aryl-1,2,3-dithiazoles derivatives. The antibacterial and antifungal activity of these compounds were measured; the dithiazoles are significantly active against fungi. Copyright (C) 1996 Elsevier Science Ltd
Convenient Synthesis of Dithiooxamides from N-Arylimino-1,2,3-dithiazoles
作者:Thierry Besson
DOI:10.1055/s-1999-3555
日期:1999.8
New syntheses of aryl isothiocyanates †
作者:Thierry Besson、Jérôme Guillard、Charles W. Rees、Valérie Thiéry
DOI:10.1039/a707801c
日期:——
cleaved by ethylmagnesium bromide in hot THF to give the corresponding isothiocyanates. The transformation 2→6→ArNCS can be performed as a ‘one-pot’ operation. The imines 2 are also converted, more slowly, into the isothiocyanates by sodium hydride in hot THF, via the cyanothioformanilides 6. Conversion of the anilides 6 into isothiocyanates is much faster under microwave irradiation in 2,6-lutidine. Mechanisms