反应详情

温度

-78 °C

To a solution of the compound of example 45 (1.28 g, 5 mmol) in THF (30 mL) at −78° C. was added a 1.7 M solution of t-BuLi in pentane (6.5 mL, 11 mmol, 2.2 eq) such that the temperature was less than −70° C. The reaction was stirred at −78° C. for 1.5 h and ethylene dibromide (0.52 mL, 6.0 mmol, 1.2 eq) was added. The reaction was stirred for 15 min at −78° C. and worked up in the usual manner. The crude product was purified by RC and recrystallized from aq methanol to afford the title compound as white needles (0.30 g, 18%). m.p. 98-99° C.

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