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Reactions pathway for synthesis of nordamnacanthal (2).
Reagents and conditions: (a) anhydrous AlCl3, NaCl, 165–175 °C, 1 h; (b) Anhydrous K2CO3 (CH3)2SO4, dry acetone, refluxed, 22 h; (c) NBS/CCl4 refluxed for 30 h; (d) 80% acetic acid refluxed 24 h; (e) PCC, CH2Cl2 stir. 2–4 h. rt; (f) AlCl3 /CH2Cl2, HCl.
