The use of nitromethane as CN-source for the direct cyanation of indoles and pyrroles is demonstrated.

Zinc-Catalyzed Direct Cyanation of Indoles and Pyrroles: Nitromethane as a Source of a Cyano Group

Gold-Catalysed Activation of Epoxides: Application in the Synthesis of Bicyclic Ketals

Camphorsulfonic acid in warm fluorobenzene facilitates the ortho rearrangement of (alkoxy-substituted) benzyl ethers of 1-(O-methyl)-2-nitroresorcinols to the corresponding o-(alkoxy-substituted) arylmethylnitrophenols. The substrate phenolic ethers are prepared by ultrasound-promoted arylmethylation of the appropriate 1-alkoxy-substituted 2-nitroresorcinol.

Synthetically useful Brønsted acid-promoted arylbenzyl ether --> o-benzylphenol rearrangements.

An advantageous methodology for the oxidative debenzylation of ethers has been developed. Very low amounts of a catalyst system based on vanadyl acetylacetonate and a triazole type pincer ligand allow the selective oxidative cleavage of a number of O-benzyl ethers in the presence of oxygen as the sole oxidant. The methodology tolerates a number of functional groups such as halo-, alkoxy-, or trifluoromethylarenes, alkyne, alkene, ether, and acetal units. Large-scale deprotections can be also carried out by the optimized procedure, which is amenable to enantioenriched reactants as well.

Vanadium‐Catalyzed Oxidative Debenzylation of O‐Benzyl Ethers at ppm Level

Debenzylation of benzyl phenyl ether and its derivatives with acetic anhydride over zeolite

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Debenzylation of benzyl phenyl ether and its derivatives with acetic anhydride over zeolite