Selektive Synthesen mit Organometallen II: Metallierung und Abwandlung funktionell substituierter Alkene
作者:J�rgen Hartmann、Ramamurthi Muthukrishnan、Manfred Schlosser
DOI:10.1002/hlca.19740570744
日期:1974.11.6
1,4-Dienes, vinyl ethers, allyl ethers, allyl thioethers and propene-thiolates are efficiently metalated by butyllithium in the presence of an activator such as potassium t-butoxide. Since the solvent, the counter-ion or the temperature may be varied before subsequent treatment with an electrophilic reagent, the critical ratio of direct vs. vinylogous attack (substitution at the α- or γ-position, respectively)
在活化剂例如叔丁醇钾的存在下,丁基锂有效地金属化了1,4-二烯,乙烯基醚,烯丙基醚,烯丙基硫醚和丙烯硫醇酯。由于在随后用亲电试剂处理之前,溶剂,抗衡离子或温度可能会发生变化,因此直接与的临界比率为。通常可以在较大的范围内调整乙烯树脂的进攻(分别在α-或γ位置取代)。在许多情况下,也可以实现立体选择性。