Intramolecular cyclization of bis-α-diazoketones: a new synthesis of 4-hydroxytropone
Abstract
The catalytic decomposition of bis-α-diazoketones, in inert solvents, under the high dilution conditions of Ruggli–Ziegler, affords cycloalk-2-ene-1,4-diones; the method was applied to the synthesis of 4-hydroxytropone (γ-tropolone).