p-Toluenesulfonic acid → HCID 20379960, compound

Participants

Reaction Steps

A mixtue of 1-(indol-3-yl)-3-(dimethylamino)propan-2-ol [9.5 g, 0.00435 mole, described by Z. G. Starostina et al., Khim.-Farm. Zh., 6, 14(1972) (Chem. Abstr., 78, 58185 r)] and p-toluenesulfonic acid (10 g, 0.0525 mole) in dry acetone (100 ml), is refluxed for 24 hours. The reaction mixture is evaporated and the residue is dissolved in water. The aqueous acidic solution is extracted with diethyl ether and the aqueous phase is basified with a saturated solution of sodium carbonate. The alkaline aqueous phase is extracted with diethyl ether and the organic extract is dried over magnesium sulfate, treated with charcoal and evaporated to give a residue of 3-[(dimethylamino)methyl]-1,3,4,9-tetrahydro-1,1-dimethylpyrano-[3,4-b]indole, a compound of formula II. The hydrochloride salt of the latter compound is crystallized from acetonitrite, mp 213°-215° C.

Provenance & Evidence