Journal
HELVETICA CHIMICA ACTA
Volume 93, Issue 6, Pages 1221-1226Publisher
WILEY-BLACKWELL
DOI: 10.1002/hlca.200900364
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A facile and efficient synthesis of 1,5-benzodiazepines with an arylsulfonamido substituent at C(3) is described. 1,5-Benzodiazepine, derived from the condensation of benzene-1,2-diamine and diketene, reacts with an arylsulfonyl isocyanate via an enamine intermediate to produce the title compounds of potential synthetic and pharmacological interest in good yields (Scheme 1). In addition, reaction of benzene-1,2-diamine and diketene in the presence of benzoyl isothiocyanate leads to N-[2-(3-benzoylthioureido)aryl]-3-oxobutanamide derivatives (Scheme 2). This reaction proceeds via an imine intermediate and ring opening of diazepine. The structures were corroborated spectroscopically (IR, (1)H- and (13)C-NMR, and EI-MS) and by elemental analyses. A plausible mechanism for this type of cyclization is proposed (Scheme 3).
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