Scalable Negishi Coupling between Organozinc Compounds and (Hetero)Aryl Bromides under Aerobic Conditions when using Bulk Water or Deep Eutectic Solvents with no Additional Ligands
作者:Giuseppe Dilauro、Claudia S. Azzollini、Paola Vitale、Antonio Salomone、Filippo M. Perna、Vito Capriati
DOI:10.1002/anie.202101571
日期:2021.5.3
Pd‐catalyzed Negishi cross‐coupling reactions between organozinc compounds and (hetero)aryl bromides have been reported when using bulk water as the reaction medium in the presence of NaCl or the biodegradable choline chloride/urea eutectic mixture. Both C(sp3)‐C(sp2) and C(sp2)‐C(sp2) couplings have been found to proceed smoothly, with high chemoselectivity, under mild conditions (room temperature
当在NaCl或可生物降解的氯化胆碱/尿素低共熔混合物存在下使用大量水作为反应介质时,有机锌化合物与(杂)芳基溴化物之间的钯催化Negishi交叉偶联反应已有报道。C(sp 3)‐C(sp 2)和C(sp 2)‐C(sp 2)已经发现,在空气中的温和条件下(室温或60°C),并与质子分解竞争时,偶联能以高化学选择性平稳地进行。其他好处包括非常短的反应时间(20 s),良好至优异的产率(高达98%),广泛的底物范围以及对各种官能团的耐受性。所提出的新颖协议是可扩展的,并且该方法的实用性通过催化剂和低共熔混合物或水的容易再循环而进一步突出。