Silver-Catalyzed Isocyanide-Alkyne Cycloaddition: A General and Practical Method to Oligosubstituted Pyrroles
作者:Jianquan Liu、Zhongxue Fang、Qian Zhang、Qun Liu、Xihe Bi
DOI:10.1002/anie.201302024
日期:2013.7.1
key: The transition‐metal‐catalyzed cycloaddition of isocyanides and unactivated terminal alkynes has been realized with Ag2CO3 as a unique and robust catalyst (see scheme). The protocol is highly efficient, allowing a broad range of terminal and internal alkynes to react under base‐ and ligand‐free conditions, generating synthetically useful oligosubstitutedpyrroles in high yields.
Ag 2 CO 3是关键:Ag 2 CO 3是一种独特而坚固的催化剂,已经实现了过渡金属催化的异氰酸酯和未活化的末端炔烃的环加成反应(参见方案)。该方案非常高效,可以使各种末端和内部炔烃在无碱和无配体的条件下反应,从而以高收率生成合成上有用的寡取代吡咯。
Photoinduced Synthesis of<i>P</i>-Perfluoroalkylated Phosphines from Triarylphosphines and Their Application in the Copper-Free Cross-Coupling of Acid Chlorides and Terminal Alkynes
P‐perfluoroalkylated phosphines from triarylphosphines and perfluoroalkyliodides has been developed. The photoinduced reaction involves the substitution of aryl groups on the phosphorus atom with perfluoroalkyl groups to successfully afford P‐perfluoroalkylated phosphines. In addition, the P‐perfluoroalkylated phosphines were found to promote the Cu‐free cross‐coupling reaction of acid chlorides with terminal
<scp>Palladium‐Catalyzed</scp>
Oxidative C≡C Triple Bond Cleavage of
<scp>2‐Alkynyl</scp>
Carbonyl Compounds Toward 1,
<scp>2‐Dicarbonyl</scp>
Compounds
<sup>†</sup>
作者:Ming‐Bo Zhou、Mu‐Jia Luo、Ming Hu、Jin‐Heng Li
DOI:10.1002/cjoc.202000040
日期:2020.6
palladium‐catalyzed oxidative strategy for the cleavage of the C≡C triple bond is presented. By employing PdCl2, CuBr2, TEMPO and air as the catalytic system and H2O as the carbonyl oxygen atom source, a wide range of 2‐alkynyl carbonylcompounds, including 1,3‐disubstituted prop‐2‐yn‐1‐ones, propiolamides and propiolates, lost an alkynyl carbon to access various 1,2‐dicarbonyl compounds, e.g., 1,2‐diones
Dimethyl Sulfoxide as an Oxygen Atom Source Enabled Tandem Conversion of 2‐Alkynyl Carbonyls to 1,2‐Dicarbonyls
作者:Yuan Lu、Mu‐Jia Luo、Ming Hu、Yang Li、Jin‐Heng Li
DOI:10.1002/adsc.202000066
日期:2020.4.27
compounds by means of a CuBr2/I2/DMSO/water system is developed, enabling the fromation of various functionalized 1,2‐dicarbonyl compounds, including 1,2‐diketones, α‐keto amides and α‐keto ester. This Cu‐promoted iodine‐mediated tandem procedure employs DMSO as the oxygen atom source of the formed carbonyl group through iodonium ion formation, nucleophilic DMSO addition and C−C bond cleavage cascades.
开发了通过CuBr 2 / I 2 / DMSO /水系统串联2-炔基羰基化合物的方法,使各种官能化的1,2-二羰基化合物(包括1,2-二酮,α-酮酰胺)形成和α-酮酸酯 此铜促进的碘介导的串联过程使用DMSO作为碘原子离子形成,亲核DMSO加成和CC键断裂级联反应形成的羰基的氧原子源。
Pd-catalyzed coupling reaction of acid chlorides with terminal alkynes using 1-(2-pyridylethynyl)-2-(2-thienylethynyl)benzene ligand
In the presence of 1-(2-pyridylethynyl)-2-(2-thienylethynyl)benzene as a ligand, the direct synthesis of alkynones has accomplished by a Pd-catalyzed coupling reaction of acid chlorides with terminal acetylenes under mild conditions.