Abstract
2,3-Dihydronaphazarin was prepared from 1,4-dimethoxybenzene and dichloromaleic anhydride. Reaction with bromochloromethane gave 1,8:4,5-bis(methylenedioxy)naphthalene which with NBS, gave 2-bromo-1,8:4,5-bis-(methylenedioxy)naphthalene. Reaction of the Grignard derivative with DMF afforded 2-formyl-1,8:4,5-bis(methylenedioxy)naphthalene. This method had several advantages compared with the reported synthesis, including fewer steps, milder condition and higher yields.
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