To provide a method of producing 2-alkoxy-substituted benzoxathiin compound which is safe and convenient.
The 2-alkoxy-substituted benzoxathiin compound represented by a general formula (A) is produced by reacting a thiosalicylic acid compound represented by a general formula (B) with an orthoformic acid ester compound, in the presence of an acid. In the general formula (A), a substituent R1 presents a group or an atom selected from 1-8C chain alkyl group, 3-8C cyclic alkyl group, 1-8C alkoxyl group and halogen atom. When there are a plurality of R1s, the respective R1s may be equal to each other or may be different from each other, and n is an integer of 0 or 1 to 4. R2 presents a 1-6C alkyl group. In the general formula (B), a substituent R1 presents a group or an atom selected from 1-8C chain alkyl group, 3-8C cyclic alkyl group, 1-8C alkoxyl group, 2-12C alkoxycarbonyl group and phenyl group and halogen atom. When there are a plurality of R1s, the respective R1s may be equal to each other or may be different from each other, and n is an integer of 0 or 1 to 4.
