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Billions and billions…of molecules? « New Drug Approvals

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'via Blog this'

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'via Blog this'

Visible-light-induced photocatalytic formyloxylation reactions of 3-bromooxindoles with water and DMF: the scope and mechanism

Visible-light-induced photocatalytic formyloxylation reactions of 3-bromooxindoles with water and DMF: the scope and mechanism

Green Chem., 2014, Advance Article
DOI: 10.1039/C4GC00647J, Paper

You-Quan Zou, Wei Guo, Feng-Lei Liu, Liang-Qiu Lu, Jia-Rong Chen, Wen-Jing Xiao
A highly efficient visible light induced formyloxylation reaction of 3-bromooxindoles was disclosed. Results of labeling experiments indicated that H₂O and DMF were incorporated into the terminal 3-formyloxyoxindoles.
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The formyloxylation reaction of 3-bromooxindoles with water and N,N-dimethylformamide (DMF) has been developed in the presence of the photoredox catalyst fac-Ir(ppy)₃ under irradiation of visible light at ambient temperature. The reaction provides a straightforward approach to pharmaceutically and synthetically useful 3-formyloxyoxindoles in high yields. The mechanism of this transformation was investigated by fluorescence quenching experiments, “on–off” switching of the light source, labeling experiments, mass spectral analyses and in situ IR experiments.

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Oxidation from Air: New Meerwein Arylation

Oxidation from Air: New Meerwein Arylation

New carbooxygenation-type version of the Meerwein arylation allows introduction of oxygen from air by using manganese dioxide
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Building Strong Carbon Acids from 1,1-Bis(triflyl)alkadienes

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