4.3.4. Synthesis of Compound 6 (30-bromolup-20(29)-ene-3β,28-diyl diacetate)

A solution of 5 (0.5 mmol, 265 mg) in dry CCl4 (5 mL) was treated with freshly recrystallized NBS (0.15 g, 0.85 mmol,) and refluxed for 3 h. The solid was filtered off and the mother liquor was evaporated under vacuum. The dark solid was recrystallized from EtOH to obtain 0.183 g (69%) as brown needles.

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