Site‐Specific Alkene Hydromethylation via Protonolysis of Titanacyclobutanes
作者:James A. Law、Noah M. Bartfield、James H. Frederich
DOI:10.1002/anie.202103278
日期:2021.6.21
Methyl groups are ubiquitous in biologically active molecules. Thus, new tactics to introduce this alkyl fragment into polyfunctional structures are of significant interest. With this goal in mind, a direct method for the Markovnikov hydromethylation of alkenes is reported. This method exploits the degenerate metathesis reaction between the titanium methylidene unveiled from Cp2Ti(μ-Cl)(μ-CH2)AlMe2
Nickel‐Catalyzed Cascade Cyclization‐Negishi Coupling of Redox Active Esters for the Synthesis of Pyrrolidines
作者:Juan Carlos Nieto‐Carmona、Raúl San Román、Elena Buñuel、Diego J. Cárdenas
DOI:10.1002/ejoc.202200992
日期:2022.11.25
Exploiting nickel radical behaviour: powerful consecutive formation of two C−C bonds, including a ring-closing reaction, allows the preparation of functionalized pyrrolidines in a single synthetic operation which also avoids the use of halogen-containing electrophiles.
The compounds represented by formulas (I) to (XVIII) or pharmaceutically acceptable salts thereof.
式 (I) 至 (XVIII) 所代表的化合物或其药学上可接受的盐类。
Nickel-Catalyzed Reductive Cyclization of Alkyl Dihalides
作者:Weichao Xue、Hailiang Xu、Zhuye Liang、Qun Qian、Hegui Gong
DOI:10.1021/ol502207z
日期:2014.10.3
The reductive coupling protocol to intra-molecular cyclization of dihaloalkanes is presented. It leads to five- and six-membered rings, with the former being more efficient. The incorporation of secondary alkyl halides generally promotes coupling, efficiency. To the best of our know ledge this is the first catalytic ring closure reaction arising form dihaloalkanes under chemical reductive conditions.