One‐Pot Sequential Kumada–Tamao–Corriu Couplings of (Hetero)Aryl Polyhalides in the Presence of Grignard‐Sensitive Functional Groups Using Pd‐PEPPSI‐IPent
<sup>Cl</sup>
作者:Narayan Sinha、Pier Alexandre Champagne、Michael J. Rodriguez、Yu Lu、Michael E. Kopach、David Mitchell、Michael G. Organ
DOI:10.1002/chem.201901150
日期:2019.5.7
We report a general and rapid chemoselective Kumada–Tamao–Corriu (KTC) cross‐coupling of aryl bromides in the presence of chlorides or triflates with functionalized Grignard reagents at 0 °C in 15 min by using Pd‐PEPPSI‐IPentCl (C4). Nucleophiles and electrophiles (or both) can contain Grignard‐sensitive functional groups (‐CN, ‐COOR, etc.). Control experiments together with DFT calculations suggest
我们报告了使用Pd-PEPPSI-IPent Cl(C4)在15°C下于0°C下在氯化物或三氟甲磺酸与功能化Grignard试剂存在下,在芳基溴化物的常规快速化学选择性Kumada-Tamao-Corriu(KTC)交叉偶联中进行的情况。。亲核试剂和亲电子试剂(或两者)可以包含对格氏试剂敏感的官能团(-CN,-COOR等)。对照实验和DFT计算表明,在Cl / OTf与功能化Grignard试剂存在下,金属转移是限制Br选择性交叉偶联的速率。首次证明了单锅顺序KTC / KTC与溴-氯代芳烃的交叉偶联。我们还报告了使用C4的单锅顺序KTC / Negishi交叉耦合 展示了这种方法的多功能性。