Palladium‐Catalyzed Regioselective Synthesis of 1‐Hydroxycarbazoles Under Aerobic Conditions
作者:So Won Youn、Young Ho Kim、Yoon Hyung Jo
DOI:10.1002/adsc.201801265
日期:2019.2
A palladium‐catalyzed aerobic C−H amidation of N‐Ts‐2‐amino‐3′‐hydroxylbiaryls has been developed to afford a diverse range of 1‐hydroxycarbazoles with high regioselectivity and efficiency. This protocol benefits from operational simplicity, robustness, and sustainability with the use of ambient air as the sole terminal oxidant. Further elaboration of the products obtained from this process provides
已开发出钯催化的N -Ts-2-氨基-3'-羟基联芳基的好氧CH H酰胺化反应,以提供具有高区域选择性和效率的各种1-羟基咔唑。通过使用环境空气作为唯一的终端氧化剂,该协议得益于操作简便,稳健性和可持续性。从该方法获得的产物的进一步精制提供了容易获得各种咔唑生物碱的方法,包括咔唑醌和双咔唑。提出了一种机制,涉及在2-氨基-3'-羟基联芳基的更受空间阻碍的C2'-位置的双指导基团辅助区域选择性CH活化。