palladium‐catalyzed C(sp3)−H activation that enables the directalkynylation of free carboxylic acid substrates. In contrast to previous synthetic methods, no introduction/removal of an exogenous directing group is required. A broad scope of acids including both α‐quaternary and challenging α‐non‐quaternary can be used as substrates. Additionally, the alkynylation in the distal γ‐position is reported. Finally
Late-Stage β-C(sp<sup>3</sup>)–H Deuteration of Carboxylic Acids
作者:Alexander Uttry、Sourjya Mal、Manuel van Gemmeren
DOI:10.1021/jacs.1c06474
日期:2021.7.28
Carboxylicacids are highly abundant in bioactive molecules. In this study, we describe the late-stage β-C(sp3)–H deuteration of freecarboxylicacids. On the basis of the finding that C–H activation with our catalysts is reversible, the de-deuteration process was first optimized. The resulting method uses ethylenediamine-based ligands and can be used to achieve the desired deuteration when using a