Reaction of (+)-usninic acid and several of its derivatives with diazomethane


New derivatives of (+)-usninic acid including products of ring expansion, methylation of enol and phenol hydroxyls, and formation of an oxirane ring in addition to products with pyran and furan rings annelated to ring A of (+)-usninic acid were prepared by reaction of (+)-usninic acid and its pyrazole derivatives with diazomethane. 
DOI: 10.1007/s10600-011-0041-z


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