Let the sunshine in! Unactivated alkyl and aryl bromides underwent a light‐enabled reductive radical cyclization in the presence of a dimeric phosphine–gold complex as a photocatalyst (see scheme; X=C(CO2Et)2, NR, O). Sunlight can be used as the energy source for this simple and efficient radical reaction, which does not require potentially hazardous and toxic chemical reagents, such as organostannanes
让阳光照进来!未活化的烷基和芳基溴化物在二聚膦-金络合物作为光催化剂的情况下进行了光活化的还原性自由基环化反应(见方案; X = C(CO 2 Et)2,NR,O)。阳光可以用作此简单有效的自由基反应的能源,该自由基反应不需要潜在危险和有毒的化学试剂,例如有机锡和化学引发剂。
Site-Specific Oxidation of (sp<sup>3</sup>)C–C(sp<sup>3</sup>)/H Bonds by NaNO<sub>2</sub>/HCl
作者:Jianyou Zhao、Tong Shen、Zhihui Sun、Nengyong Wang、Le Yang、Jintao Wu、Huichao You、Zhong-Quan Liu
DOI:10.1021/acs.orglett.1c01303
日期:2021.5.21
(sp3)C–C(sp3) and (sp3)C–H bonds in aryl alkanes by the use of NaNO2/HCl was explored. The method is chemical-oxidant-free, transition-metal-free, uses water as the solvent, and proceeds under mild conditions, making it valuable and attractive to syntheticorganicchemistry.
Starting from diverse alkene-tethered aryl iodides and O-benzoyl-hydroxylamines, the enantioselective reductive cross-electrophilic 1,2-carboamination of unactivatedalkenes was achieved using a chiral pyrox/nickel complex as the catalyst. This mild, modular, and practical protocol provides rapid access to a variety of β-chiral amines with an enantioenriched aryl-substituted quaternary carbon center
Synthesis of All‐Carbon Quaternary Centers by Palladium‐Catalyzed Olefin Dicarbofunctionalization
作者:Maximilian Koy、Peter Bellotti、Felix Katzenburg、Constantin G. Daniliuc、Frank Glorius
DOI:10.1002/anie.201911012
日期:2020.2.3
The redox-neutral dicarbofunctionalization of tri- and tetrasubstituted olefins to form a variety of (hetero)cyclic compounds under photoinduced palladium catalysis is described. This cascade reaction process was used to couple styrenes or acryl amides with a broad range of highly decorated olefins tethered to aryl or alkyl bromides (>50 examples). This procedure enables one or two contiguous all-carbon
A cobalt complex, [CoCl2(dpph)] (DPPH = [1,6-bis(diphenylphosphino)hexane]), catalyzes an intermolecular styrylation reaction of alkyl halides in the presence of Me3SiCH2MgCl in ether to yield beta-alkylstyrenes. A variety of alkyl halides including alkyl chlorides can participate in the styrylation. A radical mechanism is strongly suggested for the styrylation reaction. The sequential isomerization/styrylation