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Two coumarins isolated from Aster praealtus were synthesized via a direct coupling of the corresponding cyclohexyl carbinol with a coumarin‐derived aryl bromide or iodide, a very difficult etherification due to the excess steric congestion around the carbinol and the low reactivity of the aryl halide that frustrated many seemingly feasible protocols. Unequivocal 1H and 13C NMR data for these compounds...
The cover picture shows the first examples for the synthesis of coumarins via direct couplings of alcohols with C‐7 coumarin halides. Such reactions proved to be much more difficult than similar couplings with simple substituted phenyl halides, especially when the alcohols are sterically congested as encountered in this work. En route to the first synthesis of the two long‐known naturally occurring...
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