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A Facile and Efficient Synthesis of Arylsulfonamido-Substituted 1,5-Benzodiazepines and N-[2-(3-Benzoylthioureido)aryl]-3-oxobutanamide Derivatives

✍ Scribed by Abdolali Alizadeh; Nasrin Zohreh

Publisher
John Wiley and Sons
Year
2010
Tongue
German
Weight
158 KB
Volume
93
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

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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