I. Tamburlin-thumin et al., A convenient method for the alkylation of tropolone derivatives and related alpha-keto hydroxy compounds, SYNTHESIS-S, (7), 1999, pp. 1149-1154
A mild and general method of phase-transfer catalyzed O-alkylation of biolo
gically promising tropolones with allyl, benzyl and heterocyclic primary ha
lides was developed. This method was also applied successfully to various s
ubstituted or ring-fused tropolones: hinokitiol, hydroxymethylhinokitiol an
d trimethylpurpurogallin, and structurally-related maltol.