FIELD: organic synthesis. SUBSTANCE: invention provides method of preparing compounds of general formula II (presented in description), wherein R1, R2, R3 and R4, independently from each other, are hydrogen, halogen, C1-C4-alkyl, C1-C4-alkoxy, acetoxy, or acyl. For that, compounds of formula XIV with R1, R2, R3 and R4 defined above are brought into interaction with trimethyl orthoformate. Resulting benzofuran compounds are useful as intermediates in synthesis of agrochemical products. EFFECT: increased resource of agrochemical products. 3 cl, 7 ex
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