反应详情

A mixture of Example 1A (2.50 g, 11 mmol), 10% Pd/C (0.25 g, 0.23 mmol of Pd metal) in anhydrous methanol (25 mL) was first degassed to remove air (two vacuum/H2 cycles) after which it was capped and a balloon filled with H2 was applied to it for 12 hours. After this time the reaction mixture was filtered through diatomaceous earth (Celite®) and the filtrate was concentrated under reduced pressure to give 2.32 g of crude material. Column chromatography [silica gel; eluent hexanes-ethyl acetate (2:1)] provided the desired product (0.92 g, 39%). 1H (CDCl3) δ(ppm): 1.91-1.96 (m, 2H); 2.32 (t, 2H); 2.62 (t, 2H); 2.83 (t, 2H); 3.66 (s, 3H); 3.85 (t, 2H); 7.11-7.15 (m, 4H).

1. customto remove air (two vacuum/H2 cycles) after which it
2. customwas capped
3. additiona balloon filled with H2
4. filtrationAfter this time the reaction mixture was filtered through diatomaceous earth (Celite®)
5. concentrationthe filtrate was concentrated under reduced pressure
6. customto give 2.32 g of crude material