Cobalt-Catalyzed CH Arylations with Weakly-Coordinating Amides and Tetrazoles: Expedient Route to Angiotensin-II-Receptor Blockers
作者:Jie Li、Lutz Ackermann
DOI:10.1002/chem.201500552
日期:2015.4.7
Cobalt‐catalyzed CH arylations enabled the synthesis of biaryl tetrazoles, which are key structural motifs in antihypertensive angiotensin‐II‐receptor blockers. Thus, weakly‐coordinating benzamides were employed for step‐economical CH arylations with ample scope. Further, a low‐valent NHC complex enabled first cobalt‐catalyzed CH functionalization by tetrazole assistance.
Regioselective <i>Ortho</i>-Arylation and Alkenylation of <i>N</i>-Alkyl Benzamides with Boronic Acids via Ruthenium-Catalyzed C–H Bond Activation: An Easy Route to Fluorenones Synthesis
作者:Ravi Kiran Chinnagolla、Masilamani Jeganmohan
DOI:10.1021/ol3024067
日期:2012.10.19
A highly regioselectiveruthenium-catalyzed ortho-arylation of substituted N-alkyl benzamides with aromatic boronic acids in the presence of [RuCl2(p-cymene)}2], AgSbF6, and Ag2O is described. Further, ortho-arylated N-alkyl benzamides were converted into fluorenones in the presence of trifluoroacetic anhydride and HCl.