ribo -4-(Benzylamino)hept-1 -ene-5, 6-diol (21). A resealable Carius tube was charged with 490 mg (3.83 mmol) of (+)-18, 0.42 mL (3.85 mmol) of benzylamine, 32 mg (0.34 mmol) of phenol, and 0.9 mg (0.04 mmol) of BHT. The tube was purged with argon and heated to 145 °C for 86 h. The crude product was dissolved in CH2C12 and concentrated in vacuo to give 971 mg of crude product. Recrystallization of this sample from Et^O-CCh afforded 366 mg (mp 62-64 °C) of pure 21 as bulky plates. The mother liquors were chromatographed on 90 g of silica gel (4% MeOH in CH2C12) to afford an additional 448 mg (814 mg total, 91% yield) of crystalline 21: [a]20D +27°(c 1.2, EtOH); NMR (CDCI3) 5 7.3 (s, 5 H, aromatic), 5.76 (m, 1 , H2), 5.13 (m, 2 H,
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