PROCESS FOR PREPARING A NAPHTHALENE DERIVATIVE AND INTERMEDIATE THEREFOR

摘要

A novel process for preparing a naphthalene derivative of the formula: wherein R<1> and R<2> are a lower alkoxycarbonyl group or both may combine to form a group of the formula : one of R<3> and R<4> is hydrogen atom or a lower alkoxy group and the other is a lower alkoxy group; ring A is a substituted or unsubstituted benzene ring, which is useful as a hypolipidemic agent, and a novel intermediate of the formula: wherein R1, R2, R3, R4 and ring A are the same as defined above.