反应详情

This compound was prepared from 5-(Boc-amino)-4-oxopentanoic acid (1.00 g; 4.3 mmol), the product from 12a (1.37 g; 4.3 mmol), N,N′-dicyclohexylcarbodiimide (DCC, 1.03 g; 5.0 mmol), and pyridine (2.0 mL) in dichloromethane (40 mL) using Procedure E. The crude product was purified on a 100×50 mm silica gel 60 column eluted with ethyl acetate-hexane (1:2), collecting 16×50 mL fractions. From evaporation of fractions 4-9 gave 1.6 g (71%) product was obtained (yellowish oil).

1. customThe crude product was purified on a 100×50 mm silica gel 60 column
2. washeluted with ethyl acetate-hexane (1:2)
3. customcollecting 16×50 mL fractions
4. customFrom evaporation of fractions 4-9