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a) Formal (2+2+2) cycloadditions in complex aqueous media. b) Plausible biological pathway for the synthesis of anthraquinones. [a] Performed using substrate 3 or 6 (5 μmol), milieu (5.0 mL), 25 °C, 2 h; [b] Cell lysates 2 mg mL−1; Yields determined by NMR spectroscopy using an internal standard. Number of replicates: between 2 and 4, and errors in yields range between 3–6 %.
