| 摘要 |
Compounds represented by general formula (I) or their salts, having beta3-adrenoceptor agonism and being efficacious when employed in drugs for treating and preventing diabetes, obesity, hyperlipemia, etc. wherein R represents hydrogen or methyl; R1 represents hydrogen, halogeno, hydroxy, benzyloxy, amino or hydroxymethyl; R2 represents hydrogen, hydroxymethyl, NHR3, SO2NR4R4 ' or nitro (wherein R3 represents hydrogen, methyl, SO2R5, formyl or CONHR6'; R5 represents lower alkyl, benzyl or NR4R4'; R4 and R4' may be the same or different and each represents hydrogen, lower alkyl or benzyl; and R6' represents hydrogen or lower alkyl); R6 represents hydrogen or lower alkyl; n is 1 or 2; X represents secondary nitrogen, oxygen or sulfur; and when n is 1, then one of R7 and R8 represents hydrogen while another represents hydrogen, amino, acetylamino or hydroxy, or when n is 2, then R8 represents hydrogen while R7 represents hydrogen, amino, acetylamino or hydroxy.
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