Preparation of cis-1-hydroxy-3-substituted-6,6-dimethyl-6,6a,7,8,10,10a-hexahydro-9H-dibenzo{8 b,d{9 pyran-9-ones and intermediates therefor

摘要

Reaction of a 5-substituted resorcinol with a ketal of 4-(1-hydroxy)-1-methylethyl)-3-cyclohexen-1-one in the presence of a suitable catalyst effects condensation to provide substantially exclusively a cis-1-hydroxy-3-substituted-6,6-dimethyl-6,6a,7,8,10,10a-hexahydro-9H- dibenzo[b,d]pyran-9-one.