Six natural euglobals were synthesized by electrochemical methods. In a key step, cycloaddition between in situ generated quinomethanes and terpenes was performed on the surface of PTFE-fibre coated electrode to give natural products using 2,3-dichloro-5,6-dicyano-p-hydroquinone (DDQH2) as a redox mediator. In this reaction system, biomimetic generation and cycloaddition of the unstable quinomethanes were efficiently completed by the selective oxidation of cresol derivatives.
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Chiba et al. (1998) studied this question.
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