5381-20-4,With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.5381-20-4,Thianaphthene-3-carboxaldehyde,as a common compound, the synthetic route is as follows.
A. Preparation of nitrobenzo[b]thiophene-3-carboxaldehydes. A solution of 9 g of benzo[b]thiophene-3-carboxaldehyde in 50 ml of acetic anhydride was cooled to 0 C. by means of an external ethanol/ice bath. A solution of 40 ml of acetic acid and 20 ml of fuming nitric acid was added at such a rate to maintain the temperature of the reaction at 0-5 C. Following the addition of the reagents, the reaction mixture was stirred for 1.5 hours. The reaction mixture was poured into 500 ml of ice and extracted with ethyl acetate. The organic layer was washed with water, dried over magnesium sulfate, and evaporated in vacuo. The resulting oil was treated with ethanol. A solid formed, which was recovered by filtration providing 1.3 g of 6-nitrobenzo[b]thiophene-3-carboxaldehyde, m.p. 187-192 C. The ethanol filtrate was evaporated providing an oil which was purified by chromatography over silica gel eluding with cyclohexane.
The synthetic route of 5381-20-4 has been constantly updated, and we look forward to future research findings.
Reference£º
Patent; Eli Lilly and Company; US4659717; (1987); A;,
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