Catalytic Use of Zinc Amide for Transmetalation with Allylboronates: General and Efficient Catalytic Allylation of Carbonyl Compounds, Imines, and Hydrazones
作者:Yi Cui、Wei Li、Takehiro Sato、Yasuhiro Yamashita、Shū Kobayashi
DOI:10.1002/adsc.201201134
日期:2013.4.15
The efficient catalytic allylation of ketones, imines, and hydrazones with allylboronates using a catalytic amount of zinc amide is reported. In this reaction, the boron‐to‐zinc exchange process occurred smoothly to afford the corresponding allylzinc amides, and the desired allylation reactions proceeded in high efficiency (∼0.1 mol%). A mechanistic study revealed that transmetalation was a rate‐determining
据报道,使用催化量的酰胺锌可有效地将酮,亚胺和与烯丙基硼酸酯催化烯丙基化。在该反应中,硼锌交换过程平稳进行,得到相应的烯丙基锌酰胺,所需的烯丙基化反应高效进行(约0.1摩尔%)。一项机理研究表明,金属转移是催化循环中一个决定速率的步骤,而且锌中心的酰胺配体在制备活性烯丙基锌中起着关键作用。还研究了催化不对称烯丙基化,并使用手性二胺配体获得了高对映选择性。