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O-Methylcedrusin, a minor component in 'sangre de drago', has been synthe- sized using a strategy of successive protection and deprotection reactions under very mild conditions. The key step of this synthesis is a selective protection of a catechol group as a cyclic carbonate in the presence of an isolated phenol group.

Synthesis of 4-O-Methylcedrusin. Selective Protection of Catechols with Diphenyl Carbonate