Highly Functionalized Benzene Syntheses by Directed Mono or Multiple Magnesiations with TMPMgCl·LiCl
摘要:
The direct magnesiation of highly functionalized aromatics bearing an ester, a nitrile, or a ketone can be readily performed by using an OBoc as a directing group and TMPMgCl-LiCl as a base. It allows, for example, the preparation of a meta-magnesiated benzophenone in > 95%. After quenching, highly functionalized and substituted benzenes are obtained.
Highly Functionalized Benzene Syntheses by Directed Mono or Multiple Magnesiations with TMPMgCl·LiCl
摘要:
The direct magnesiation of highly functionalized aromatics bearing an ester, a nitrile, or a ketone can be readily performed by using an OBoc as a directing group and TMPMgCl-LiCl as a base. It allows, for example, the preparation of a meta-magnesiated benzophenone in > 95%. After quenching, highly functionalized and substituted benzenes are obtained.
Unified Protocol for Fe-Based Catalyzed Biaryl Cross-Couplings between Various Aryl Electrophiles and Aryl Grignard Reagents
作者:Lei Wang、Yi-Ming Wei、Yan Zhao、Xin-Fang Duan
DOI:10.1021/acs.joc.9b00151
日期:2019.5.3
Ti(OEt)4/PhOM enabled a highly general iron-based catalyst system, which could efficiently catalyze the biaryl coupling reaction between various electrophiles (I, Br, Cl, OTs, OCONMe2, OSO2NMe2) and common or functionalized aryl Grignardreagents with high functional group tolerance. Selective couplings of aryl iodides and bromides over the corresponding oxygen-based electrophiles have been achieved, and