The first synthesis of cremeomycin (3-diazo-4-methoxy-2-oxocyclohexa-4,6-dienecarboxylic
acid), a naturally occurring diazocarbonyl
compound, is described. Starting from methyl 2-hydroxy-4-methoxybenzoate,
nitration, hydrolysis, and reduction gave 3-amino-2-hydroxy-4-methoxybenzoic
acid as the key aminophenol precursor, diazotization of which gave
the diazoquinone natural product.
natural products - total synthesis - diazo
compounds - electrophilic aromatic substitution