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A correction was published on 24 September 2012, see Pharmaceuticals 2012, 5(9), 1044.

Pharmaceuticals 2012, 5(5), 460-468; doi:10.3390/ph5050460
Article

Synthesis and Spectroscopic Analysis of Novel 1H-Benzo[d]imidazoles Phenyl Sulfonylpiperazines

1,2
Received: 18 March 2012 / Revised: 18 April 2012 / Accepted: 27 April 2012 / Published: 3 May 2012
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Abstract

A group of benzimidazole analogs of sildenafil, 3-benzimidazolyl-4-methoxy-phenylsulfonylpiperazines 2–4 and 3-benzimidazolyl-4-methoxy-N,N-dimethyl- benzenesulfonamide (5), were efficiently synthesized. Compounds 2–5 were characterized by NMR and MS and contrary to the reported mass spectra of sildenafil, the spectra of the piperazine-containing compounds 2–4 showed a novel fragmentation pattern leading to an m/z = 316. A mechanism for the formation of this fragment was proposed.
Keywords: phenyl sulfonylpiperazine; benzimidazole; mass spectrometry; NMR phenyl sulfonylpiperazine; benzimidazole; mass spectrometry; NMR
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Qandil, A.M. Synthesis and Spectroscopic Analysis of Novel 1H-Benzo[d]imidazoles Phenyl Sulfonylpiperazines. Pharmaceuticals 2012, 5, 460-468.

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