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Procedure for the Synthesis of 6c A mixture of 2 (359 mg, 1.00 mmol, 4-methoxyphenylhydrazine hydrochloride (3c, 175 mg, 1.00 mmol) and NaOAc (200 mg, 2.44 mmol) in MeOH (5 mL) was stirred for 1 h at r.t. The white precipitate was filtered off and dried to give pure 4c (407 mg, 85, Compound 4c was dissolved in CH2Cl2 (10 mL) and BF3·OEt2 (0.09 mL, 0.3 mmol) was added dropwise at 0°C under a nitrogen atmosphere. After 20 min, the reaction was quenched by the addition of 1 M aq NaHCO3 (20 mL, The organic phase was separated, the aqueous phase was extracted with CH2Cl2 (3 x 10 mL) and the combined organic phases were dried over Na2SO 4. Evaporation in vacuo and recrystallization from CH 2Cl2-hexane afforded 453 mg (95, of 6c as white crystals; Rf, 0.32 EtOAc-CH2Cl 2
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3].
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