2 article(s) from Karim, Md. Rokon Ul
- Full Research Paper
- Published 05 Nov 2020
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Figure 1: Structure of the nocarimidazoles 1–4 and the bulbimidazoles 5–7.
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Figure 2: COSY and key HMBC correlations for 1 and 2.
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Scheme 1: Synthesis of the model compounds 8 and 9.
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Figure 3: 1JC,H coupling constant for the imidazole ring of the natural products 1 and 5 and the model compou...
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Figure 4: Determination of the absolute configuration of 1 (a), 4 (b), and 5 (c) by the Ohrui–Akasaka method.
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Figure 5: Stereochemical diversity of the anteiso-chain chirality in microbial metabolites.
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- Full Research Paper
- Published 25 May 2020
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Figure 1: Structures of pseudosporamide (1) and pseudosporamicins A–C (2–4).
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Figure 2: COSY, key HMBC and ROESY correlations of pseudosporamide (1).
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Figure 3: 1H NMR ΔδS−R values for PGME amides 5a and 5b obtained from compound 1.
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Figure 4: The opposite axial chirality around the biaryl C-6–C-7'' bond influenced by the C-2 configuration i...
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Figure 5: The experimental and calculated ECD spectra in MeCN.
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Figure 6: COSY, key HMBC and NOESY correlations of compound 2.
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Figure 7: NOESY correlations for the spiroacetal moiety of compound 2.
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Figure 8: Selected examples of oligomycin-class metabolites from actinomycetes.
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