Tandem Photoredox and Copper-Catalyzed Decarboxylative C(sp<sup>3</sup>)–N Coupling of Anilines and Imines Using an Organic Photocatalyst
作者:Guido Barzanò、Runze Mao、Marion Garreau、Jerome Waser、Xile Hu
DOI:10.1021/acs.orglett.0c01769
日期:2020.7.17
An organic photoredox catalyst, 4CzIPN, was used in combination with a coppercatalyst, CuCl, to effect decarboxylative C(sp3)–N coupling. The coupling worked with both anilines and imines as nitrogen sources and could be used to prepare a variety of alkyl amines from readily available alkyl carboxylic acids.
The oxidative coupling of photogenerated alkyl radicals with readily available styrenes is disclosed. This visible-light-mediated method allows rapid access to a wide range of α-alkyl-acetophenones in good yields and with high functional group tolerance. In addition, the developed protocol features room temperature conditions, low photocatalyst loadings, and the use of dimethyl sulfoxide as nontoxic
A Radical Approach to Anionic Chemistry: Synthesis of Ketones, Alcohols, and Amines
作者:Shengyang Ni、Natalia M. Padial、Cian Kingston、Julien C. Vantourout、Daniel C. Schmitt、Jacob T. Edwards、Monika M. Kruszyk、Rohan R. Merchant、Pavel K. Mykhailiuk、Brittany B. Sanchez、Shouliang Yang、Matthew A. Perry、Gary M. Gallego、James J. Mousseau、Michael R. Collins、Robert J. Cherney、Pavlo S. Lebed、Jason S. Chen、Tian Qin、Phil S. Baran
DOI:10.1021/jacs.9b02238
日期:2019.4.24
Historically accessed through two-electron, anionicchemistry, ketones, alcohols, and amines are of foundational importance to the practice of organic synthesis. After placing this work in proper historical context, this Article reports the development, full scope, and a mechanistic picture for a strikingly different way of forging such functional groups. Thus, carboxylic acids, once converted to redox-active
Stereoselective and Divergent Construction of β-Thiolated/Selenolated Amino Acids via Photoredox-Catalyzed Asymmetric Giese Reaction
作者:Hongli Yin、Mengjie Zheng、Huan Chen、Siyao Wang、Qingqing Zhou、Qiang Zhang、Ping Wang
DOI:10.1021/jacs.0c04994
日期:2020.8.19
photoredox-catalyzed asymmetric method for the preparation of enantiopure β-thiolated/selenolated aminoacids using a simple chiral auxiliary, which controls the diastereoselectivity of the key alkylation step and acts as an orthogonal protecting group in the subsequent peptide synthesis. Our protocol can be used to prepare a wide range of β-thiolated/selenolated aminoacids on a gram scale, which would otherwise
硫和硒由于其氧化还原活性、高亲核性和酰基转移能力而在生物学中占有重要地位。硫醇化/硒化氨基酸,包括半胱氨酸、硒代半胱氨酸及其衍生物,在调节蛋白质的构象和功能方面发挥着关键作用,并作为肽设计和生物偶联的重要基序。不幸的是,获得对映体纯的 β-硫醇化/硒化氨基酸的通用且简明的方法仍然是一个未解决的问题。在此,我们提出了一种光氧化还原催化的不对称方法,使用简单的手性助剂制备对映体纯的 β-硫醇化/硒化氨基酸,它控制关键烷基化步骤的非对映选择性,并在随后的肽合成中充当正交保护基。我们的协议可用于在克规模上制备各种 β-硫醇化/硒化氨基酸,否则使用传统方法很难获得。通过制备一系列肽基硫醇/硒醇类似物,包括细胞色素 c 氧化酶亚基蛋白 7C 和催产素,我们的化学作用得到进一步强调和验证。
Electrochemically promoted decarboxylative borylation of alkyl N-hydroxyphthalimide esters
An electrochemically promoted decarboxylativeborylation reaction is reported. The reaction proceeds under mild conditions in an undivided cell without use of transition metal- or photo-catalysts. The key feature of the reaction is the compatibility of diboron reagents with the electrochemical conditions. This reaction exhibits broad substrate scope, good functional group tolerability, and easy scalability