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A mixture of the starting material, tryptophol (32.2 g, 0.2 mole), acetonyl acetate (23.2 g, 0.2 mole) and 3.2 g of p-toluenesulfonic acid in 500 ml of benzene is refluxed for 11/2 hr. in the presence of a Dean-Stark water trap. The benzene solution is washed with 5% sodium bicarbonate, water, dried and evaporated to afford an oil. The oil is subjected to chromatography on a silica gel column using 10% ethyl acetate in benzene as eluent. The acetate 1-methyl-1,3,4,9-tetrahydropyrano[3,4-b]indole-1-methanol acetate is obtained as an oil, nmr (CDCl3) δ1.52 (S,3H), 2.08(S,3H), 4.35(2H).

1. temperatureis refluxed for 11/2 hr
2. washThe benzene solution is washed with 5% sodium bicarbonate, water
3. customdried
4. customevaporated
5. customto afford an oil