we report an efficient protocol for the C(sp2)–H carbonylation of amino acid derivatives based on an inexpensive cobalt(II) salt catalyst. Carbonylation was accomplished using picolinamide as a tracelessdirectinggroup, CO (1 atm) as the carbonyl source, and Co(dpm)2 as the catalyst. A broad range of phenylalanine derivatives bearing diverse functional groups were tolerated. Moreover, the method can
Pd‐Catalyzed C(sp
<sup>2</sup>
)−H Alkoxycarbonylation of Phenethyl‐ and Benzylamines with Chloroformates as CO Surrogates
作者:Paula Andrade‐Sampedro、Jon M. Matxain、Arkaitz Correa
DOI:10.1002/chem.202005338
日期:2021.3.26
The site‐selective functionalization of C−H bonds within a complex molecule remains a challenging task of capital synthetic importance. Herein, an unprecedented Pd‐catalyzedC(sp2)−Halkoxycarbonylation of phenylalanine derivatives and other amines featuring picolinamide as the directing group (DG) is reported. This oxidative coupling is distinguished by its scalability, operational simplicity, and
复杂分子中CH键的位点选择性官能化仍然是一项具有资本合成重要性的挑战性任务。本文报道了空前的钯催化苯丙氨酸衍生物和其他以吡咯酰胺为导向基团(DG)的胺的Pd催化的C(sp 2)-H烷氧基羰基化反应。这种氧化偶合以其可扩展性,操作简便性而著称,并避免使用有毒的一氧化碳作为C 1源。值得注意的是,DG的易裂解使得异吲哚啉酮化合物的有效组装成为可能。密度泛函理论计算支持Pd II / Pd IV催化循环。
Site-Selective Modification of Peptides via Late-Stage Pd-Catalyzed Tandem Reaction of Phenylalanine with Benzoquinone
straightforward approach for site-selective functionalization of phenylalanine and phenylalanine-containing peptide via a Pd-catalyzed tandem reaction has been developed. The robust method underwent dualC–Hactivation, including C–C coupling with benzoquinone and intramolecular C–N cyclization, providing a feasible and rapid synthetic route to incorporate 4-benzoquinone-indoline fragments into peptides.
Pd-catalyzed site-selective C(sp<sup>2</sup>)–H radical acylation of phenylalanine containing peptides with aldehydes
作者:Marcos San Segundo、Arkaitz Correa
DOI:10.1039/c9sc03425k
日期:——
the first Pd-catalyzed δ-C(sp2)–H acylation of Phe containing peptides with aldehydes is described. This oxidative coupling is distinguished by its site-specificity, tolerance of sensitive functional groups, scalability, and enantiospecificity and exhibits entire chemoselectivity for Phe motifs over other amino acid units. The compatibility of this dehydrogenative acylation platform with a number of
Copper-Catalyzed Chemodivergent Synthesis of Oxazoles and Imidazolidones by Selective C–O/C–N Cyclization
作者:Jian Tang、Fengjie Lu、Xinyi Zhang、Yiming Su、Ensheng Zhang、Zhiyu Yang
DOI:10.1021/acs.joc.3c00505
日期:2023.7.21
Efficient synthesis of phenylalanine-derived oxazoles and imidazolidones can be achieved by copper-catalyzed reactions that are controlled by directing groups and proceed by selective C–O or C–Ncoupling. This strategy employs inexpensive commercial copper catalysts and readily available starting materials. It uses a convenient reaction procedure and provides a reliable approach to the versatile and