Reaction of allylmagnesiumbromide with trifluoromethyl oximes is different than with other Grignard reagents. On the other hand, allylmagnesiumbromide acted as a reducing agent towards trifluoromethyl ketones. By using an excess of this Grignard reagent, an exclusive addition reaction is obtained. A single electron reaction is suggested to explain the reductive process.
Asymmetriccatalytic allylation of halo-substituted ketones and ketoesters was accomplished to yield a number of homoallylic tertiary alcohols in excellent reactivity and enantioselectivity. In the presence of chiral InIII/N,N′-dioxide catalyst, unusual α-selective allylation of γ-substituted potassium allyltrifluoroborates to ketones was demonstrated. The control experiments and DFT calculation reveal
完成了卤代酮和酮酯的不对称催化烯丙基化,以产生许多具有优异反应性和对映选择性的高烯丙基叔醇。在手性 In III / N , N'-二氧化物催化剂的存在下,证明了 γ-取代的烯丙基三氟硼酸钾不寻常的 α-选择性烯丙基化为酮。对照实验和 DFT 计算表明,手性 In III / N , N'-二氧化物催化剂具有双重作用:通过金属转移和路易斯酸活化形成烯丙基物种。提供了一种可能的反应途径来理解 α-选择性优于 γ-选择性。