METHOD FOR PREPARING BENZO[b]THIOPHENES Russian patent published in 2005 - IPC

Abstract RU 2260004 C2

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for preparing benzo[b]thiophenes of the formula (I):

wherein X represents sulfur atom (S); R¹ represents CN or COOA; each among R² and R³ represents hydrogen atom; A represents (C₁-C₆)-alkyl. Method involves the dehydrogenation reaction of tetrahydrobenzothiophene of the formula (II):

wherein R¹-R³ and X have values given above; Ac represents (C₁-C₆)-acyl in the presence of a catalyst taken in the catalytic amount based on precious metal and hydrogen acceptor followed by deacylation reaction of acylated amino-group by amine effect. Compounds of the formula (I) are intermediate substances in producing dyes, agents for plants protection and in manufacture of drugs.

EFFECT: improved preparing method.

7 cl, 3 ex

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RU 2 260 004 C2

Authors

Vartenberg Frank-Khardi

Koppe Tomas

Vettsel' Val'Ter

Vidra Markus

Bents Akhim

Dates

2005-09-10—Published

2001-03-09—Filed