反应详情

温度

-78 °C

To a solution of the compound of example 45 (1.28 g, 5 mmol) and TMEDA (0.91 mL, 6.0 mmol, 1.2 eq) in THF at −78° C. was added a 1.7 M solution of t-BuLi in pentane (7.1 mL, 12 mmol, 2.4 eq) such that the temperature was less than −70° C. The reaction was stirred at −78° C. for 2 h and methyl iodide (0.44 mL, 7.0 mmol, 1.4 eq) was added. The reaction was stirred for 15 min at −78° C. and worked up in the usual manner. The crude product was recrystallized from aq methanol and then from hexanes to afford the title compound as white crystals (0.62 g, 46%). m.p. 94-95° C.

1. customwas less than −70° C
2. stirringThe reaction was stirred for 15 min at −78° C.
3. customThe crude product was recrystallized from aq methanol