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Das 3‐Chlor‐2‐phenethyl‐isochinolon (I) cyclisiert bei UV‐Bestrahlung in methanolischer Lösung intramolekular zum 8‐Oxoprotoberberin‐Derivat (II).

Cesium Fluoride-Mediated Claisen Rearrangements of Phenyl Propargyl Ethers: Substituent Effects of an ortho-Alkoxy Group on the Benzene Ring or Modified Propargyl Residues. -Catalytic CsF alters the rearrangement of phenyl propargyl ethers (I) in refluxing N,N-diethylaniline to yield the benzo[b]furans (II) instead of coumarins (III). On the other hand the rearrangement is not affected with propargyl ethers such as (IV) and (VII) carrying a 1,1-dimethyl or 3-ethoxycarbonyl modified residue. -(ISHIKAWA, T.; MIZUTANI, A.; MIWA, C.; OKU, Y.; KOMANO, N.; TAKAMI, A.; WATANABE, T.; Heterocycles

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