4-Toluenesulfonyl chloride → 2-Amino-3-benzoyl-6-(4-methylphenylsulphonyl)-4,5,6,7-tetrahydrothieno[2,3-c]pyridine

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Reaction Steps

To a well-stirred and ice-cooled solution of 2-amino-3-benzoyl-4,5,6,7-tetrahydrothieno[2,3-c]pyridine (0.78 mmol, 0.2 g) in dichloromethane (20 ml) under an argon atmosphere, was added triethylamine (0.162 ml) and then p-toluenesulfonyl chloride (0.93 mmol, 177 mg) portionwise. The suspension was stirred at room temperature for 24 h and the precipitated solid was filtered. The organic solution was evaporated under vacuum to give a solid residue which was chromatographed on silica gel eluting with ethyl ether and petroleum ether mixture to afford 2-amino-3-benzoyl-6-(4-methylphenylsulphonyl)-4,5,6,7-tetrahydrothieno[2,3-c]pyridine. (m.p.165-167° C., 85 yield). 1 H-NMR (CDCl3): 1.95 (m, 2H); 2.43 (s, 3H); 3.07 (t, 2H); 3.51 (s, 2H); 6.76 (sb, 2H); 7.3-7.67 (m, 9H).

Provenance & Evidence