反应条件
1: 1) lithium bis(trimethylsilyl)amide / 1) THF, -78 deg C up to r.t., 2 h, 2) THF, a) -78 deg C, 2 h, b) r.t., 6 h
2: 95 percent / N-bromosuccinimide, benzoyl peroxide / CCl4 / 1 h / 80 - 85 °C
3: 100 percent / diethyl ether / 24 h / Ambient temperature
4: 68 percent / NaH / tetrahydrofuran / 1) 0 deg C, 1 h, 2) r.t., 24 h
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