311807-80-4Relevant academic research and scientific papers
Anti-HIV-1 activity of pyrryl aryl sulfone (PAS) derivatives: Synthesis and SAR studies of novel esters and amides at the position 2 of the pyrrole nucleus
Silvestri, Romano,Artico, Marino,La Regina, Giuseppe,De Martino, Gabriella,La Colla, Massimiliano,Loddo, Roberta,La Colla, Paolo
, p. 201 - 210 (2004)
A SAR study has been performed in order to evaluate how much the ester function could be a determinant for the anti-human immunodeficiency virus type-1 activity of pyrryl aryl sulfones (PASs), a potent family of non-nucleoside reverse transcriptase (RT) inhibitors discovered in the last years. Twenty-three new esters were prepared with the aim to enhance the inhibitory potency of 4a and 4c, two PAS agents endowed with good activity (EC50 = 0.14 μM) and deprived of cytotoxicity up to >200 μM. None of test derivatives was as potent as 4a and 4c and lacked of selectivity due to their higher cytotoxicity (compounds 22-25). Antiviral activity correlate with an ester ramified chain.
Reductive smiles rearrangement of 1-[(5-chloro-2-Nitrophenyl)sulfonyl]-1H-pyrrole-2-carbohydrazide to 1-amino-6-chloro-2-(1H-pyrrol-2-yl)benzimidazole
Silvestri, Romano,Pifferi, Augusto,De Martino, Gabriella,Massa, Silvio,Saturnino, Carmela,Artico, Marino
, p. 2163 - 2174 (2007/10/03)
Treatment of 1-[(5-chloro-2-nitrophenyl)sulfonyl]-1H-pyrrole-2-carbohydrazide with powdered iron in glacial acetic acid afforded 1-amino-6-chloro-2-(1H-pyrrol-2-yl)benzimidazole as the sole product. This compound was also obtained by iron-acetic acid reduction of 1-(5-chloro-2-nitrophenyl)-1H-pyrrole-2-carbohydrazide. Splitting of the sulfone group occurred only in the presence of the carbohydrazide group. In fact, iron-acetic acid reduction of 5-chloro-2-nitrophenyl 2-ethoxycarbonyl-1H-pyrrol-1-yl sulfone gave the expected 2-amino-5-chlorophenyl 2-ethoxycarbonyl-1H-pyrrol-1-yl sulfone. Treatment of this compound with hydrazine yielded the corresponding carbohydrazide, which failed cyclization when reacted with phosphorus pentoxide. Formation of 7-chloropyrrolo[1,2-b] [1,2,5]benzothiadiazepin-11(10H)-one 5,5-dioxide with loss of hydrazine was observed when the above amino hydrazide was reacted with 2-hydroxypyridine or with glacial acetic acid.
