Methylamine → 4-Methylaminomethyl-2,3,4,9-tetrahydrothiopyrano[2,3-b]indole

Beteiligte Stoffe

Reaktionsschritte

To a solution of the product of the above (2) (2.17 g) in absolute methanol (10 ml) is added a 30% solution (2.2 ml) of methylamine in methanol. The mixture is stirred at room temperature for 1 hour. Sodium borohydride (380 mg) is added to the filtrate. The mixture is stirred at room temperature for 2 hours and evaporated to remove the solvent. The residue is acidified with 2 N hydrochloric acid after addition of water. The solution is extracted with chloroform to remove neutral impurities. The aqueous layer is made alkaline with an aqueous solution of sodium hydroxide and extracted again with chloroform. The extract is washed with water, dried and evaporated to remove the solvent. The residue is treated with small amount of benzene to give the 1/6 benzene adduct (2.21 g) of the title compound melting at 78°-81° C. Yield: 90%

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