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(S)-2-Amino-3-phosphonopropanoicA cid (3a, L-AP-3).
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
concentrated in vacuo, diluted with absolute EtOH (40 mL), and
treated with propylene oxide (6 mL). The resulting suspension
was heated at 50 "C for 2 h before being concentrated in vacuo
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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