Gold-catalyzed annulations of allenes with N-hydroxyanilines to form indole derivatives with benzaldehyde as a promoter
作者:Rahul Kisan Kawade、Po-Han Huang、Somnath Narayan Karad、Rai-Shung Liu
DOI:10.1039/c3ob42131g
日期:——
Gold-catalyzed syntheses of 2,3-disubstituted indole derivatives from N-hydroxyanilines and allenes are described; these reactions require benzaldehyde as an additive to generate nitrones in situ. Our control experiments indicate that nitrones and water were indispensable in the reactions whereas N-hydroxyanilines alone were inactive nucleophiles. This synthetic method is compatible with allenes and
Cobalt-Catalyzed Markovnikov Selective Sequential Hydrogenation/Hydrohydrazidation of Aliphatic Terminal Alkynes
作者:Jieping Chen、Xuzhong Shen、Zhan Lu
DOI:10.1021/jacs.0c07258
日期:2020.8.26
pot. A cobalt hydride species was employed as two roles for both a unique metal-catalyzed Markovnikov-type insertion of the aliphatic terminal alkynes and then metal-catalyzedhydrogen atom transfer of alkenes. This operationally simple protocol exhibits excellent functional group tolerance and step economy. The hydrazone products could be easily transferred to various valuable amine derivatives.
Cobalt-Catalyzed Asymmetric Synthesis of gem-Bis(silyl)alkanes by Double Hydrosilylation of Aliphatic Terminal Alkynes
作者:Jun Guo、Hongliang Wang、Shipei Xing、Xin Hong、Zhan Lu
DOI:10.1016/j.chempr.2019.02.001
日期:2019.4
value in asymmetric synthesis, functional materials, and medicinal chemistry. Compared with single-silyl compounds, bis(silyl) ones are understudied because of the lack of the efficient synthetic protocols. The development of efficient synthetic approaches to access bis(silyl) compounds is highly desirable for studying their basic properties and potential utilities. Here, a cobalt-catalyzed sequential
The invention concerns compounds of formula (I): R-A-R′ wherein: A is as defined in the description; R represents a group (V), (VI), (VII) or (VIII), where E, Q, R
1
, R
2
, R
3
, v and R
4
are as defined in the description; R′ represents a —(CH
2
)t-R
5
group wherein t and R
5
are as defined in the description.