Photocatalytic Hydrogen Production from Hantzsch 1,4-Dihydropyridines by Platinum(II) Terpyridyl Complexes in Homogeneous Solution
摘要:
1,4-Dihydropyridines have been photocatalytically oxidized to pyridines by platinum(II) terpyridyl complexes with the generation of hydrogen in homogeneous solution. The hydrogen production proceeds in quantitative yield and with great catalytic turnover.
Photocatalytic divergent decarboxylative amination: a metal-free access to aliphatic amines and hydrazines
作者:Xianli Shu、Ruting Xu、Saihu Liao
DOI:10.1007/s11426-021-1048-4
日期:2021.10
abundant carboxylic acids as the feedstock and a commercial diazirine as a nitrogen donor. This process is amenable to access both imines and diaziridines, as the corresponding masked amines and hydrazines, through a selectable single or double nitrogen transfer from the diazirine, respectively. This divergent approach works well in both directions with various alkyl carboxylic acids, including primary
Reduction of Electron‐Deficient Alkenes Enabled by a Photoinduced Hydrogen Atom Transfer
作者:Natalia A. Larionova、Jun Miyatake Ondozabal、Xacobe C. Cambeiro
DOI:10.1002/adsc.202000751
日期:2021.1.19
Direct hydrogen atom transfer from a photoredox‐generated Hantzsch ester radical cation to electron‐deficient alkenes has enabled the development of an efficient formal hydrogenation under mild, operationally simple conditions. The HAT‐driven mechanism is supported by experimental and computational studies. The reaction is applied to a variety of cinnamate derivatives and related structures, irrespective
作者:Paul F.C. Van Der Meij、Ruth D. Lohmann、Eduard R. De Waard、Tjoe B.R.A. Chen、Upendra K. Pandit
DOI:10.1016/s0040-4020(01)87547-5
日期:1986.1
lead to the formation of products which are derived from an “exocyclic methyleneintermediate” analogous to the one formed in the thymidylate synthase reaction. The intermediate has been identified by (a) spectral studies, (b) formation of adducts with dihydropyridine and dihydroquinonline derivatives and (c) its reduction to the corresponding thyminederivative. These results provide chemical precedence
Anti-Markovnikov hydroarylation of alkenes <i>via</i> polysulfide anion photocatalysis
作者:Haoyu Li、Yuliang Liu、Shunsuke Chiba
DOI:10.1039/d1cc02185k
日期:——
A protocol for anti-Markovnikov hydroarylation of alkenes with aryl halides has been developed using polysulfide anions as photocatalysts in the presence of the Hantzsch ester and water under irradiation with visible light.
It's a trap! Both epoxides and aziridines substituted by an aryl ketone can be reduced efficiently using visible‐light photoredox catalysts. The radicals generated were trapped by allyl sulfones, and formed α‐branched β‐hydroxy or amino derivatives with high diastereocontrol (see scheme; dtbbpy=4,4′‐di‐tert‐butyl‐2,2′‐bipyridine, ppy=2‐phenylpyridine).