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Compound 2a (2.00 g, 6.43 mmol) was heated at reflux in 6 N HC1
(30 mL) under Nz for 22 h. Upon cooling, the mixture was
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treated with propylene oxide (6 mL). The resulting suspension
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to give a white solid. Recrystallization was accomplished from
50% EtOH/HzO to afford 0.344 g of white crystals (32%):
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