5-氯-1-苯并噻吩-2-羧酸甲酯 、 一水合肼 在
two 、 甲醇 作用下,
以
乙醇 、 ice water 为溶剂,
反应 0.75h,
以5-Chloro-2-benzo[b]thiophene-carboxylic acid hydrazide with a melting point of 254°-255° is obtained的产率得到5-Chloro-2-benzo[b]thiophene-carboxylic acid hydrazide
Oxothia compounds, especially 2-oxo-2,3-dihydro-benzo[b]thiophene compounds of the formula ##STR1## in which Ph represents an optionally substituted 1,2-phenylene radical, X represents oxygen or sulphur, R.sub.1 represents an organic radical bonded via a carbon atom and R.sub.2 denotes hydrogen or an optionally substituted hydrocarbon radical of aliphatic character, and their salts are useful as peripheral analgetics and/or as antiphlogistic uricosuric and/or thrombolytic agents.