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Articles by Atta-ur- Rahman
Total Records ( 4 ) for Atta-ur- Rahman
  Amal Al-Aboudi , Mohammad Yasin Mohammad , S. Ghulam Musharraf , M. Iqbal Choudhary and Atta-ur- Rahman
  The microbial transformation of testosterone by the fungi Rhizopus stolonifer and Fusarium lini has been investigated for the first time. The bioconversion reactions observed from R. stolonifer included oxidation of a 17β-hydroxyl group, a hydroxylation at equatorial 11α position, reduction of the double bond at C-4 with oxidation of the methylene at C-6 to the corresponding keto group, and lactonisation of ring D; the latter is the first report of this reaction by a Rhizopus species. Fusarium lini promoted 1-dehydrogenation of the steroid, which has been rarely observed in fungi cultures. The other routes of biotransformations included oxidation of the 17β-hydroxyl group and the hydroxylation at 11α position. These reactions are not common for Fusarium species.
  Atta-ur- Rahman , Atia-tul- Wahab , S. Zia Sultani , Sarfraz A. Nawaz and M. Iqbal Choudhary
  A new bisbenzylisoquinoline alkaloid, 1,2-dihydrokurramine (1), and four known bisbenzylisoquinoline alkaloids 2-5, along with a morphinan alkaloid 6 were isolated from Cocculus pendulus. The structures for these compounds were deduced by spectroscopic methods. All bisbenzylisoquinoline alkaloids showed inhibitory activities against acetyl- and butyrylcholinesterases.
  M. Iqbal Choudhary , M. Atif and Atta-Ur- Rahman
  Transformation of lynestrenol (19-nor-17α-pregn-4-en-20-yn-17β-ol) (1) was carried out by incubation with Cunninghamella elegans to obtain 19-nor-17α-pregn-4-en-20-yn-3-one-10β,17β-diol (2), 19-nor-17α-pregn-4-en-20-yn-3-one-6β,17β-diol (3), and 19-nor-17α-pregn-4-en-20-yn-3β,6β,17β-triol (4). Metabolite 4 was identified as a new compound. These metabolites were structurally characterised on the basis of spectroscopic techniques.
  Syeda Farina Asghar , Habib-ur- Rehman , Atta-ur- Rahman and M. Iqbal Choudhary
  Phytochemical investigations on the methanol extract of Iris germanica resulted in the isolation of a new benzene derivative, 2´-methyl-6´-hydroxy cyclohexenyl-3-methyl-1-acetophenone ether (1). Further, another known benzene derivative, isopenol (2), also afforded two known isoflavones, irisolone (3) and irisolidone (4). The structure of the new compound was determined on the basis of spectroscopic data, including 2D-NMR experiments, while the known compounds were identified on the basis of their spectral data and existing literature evidence. The comparison of the spectral data of the irisolidone (3) with that reported for the molecule led us to revise some of the reported 1H-NMR chemical shift assignments.
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