10-chloro-Benzo[kl]xanthene

A method for preparing a 10-chloro-Benzo[kl]xanthene compound, comprising the steps of:
s1, under the protection of nitrogen or inert gas, taking 1, 8-dibromonaphthalene and 2-methoxy-5-chlorobenzeneboronic acid as raw materials, and carrying out Suzuki coupling reaction under the catalytic action of palladium tetratriphenylphosphine to synthesize a compound of formula (I);
s2, demethylating the compound of the formula (I) synthesized by the S1 and boron tribromide to synthesize a compound of a formula (II);
s3, carrying out dehydrobromination cyclization reaction on the compound of the formula (II) synthesized by the S2 under alkaline conditions to obtain a 10-chlorobenzo [ kl ] xanthene compound shown in the formula (III);
the synthetic route is as follows: