p-Toluenesulfonic acid → (4R,9aR)-6-(2-hydroxy-ethoxymethyl)-4-methyl-3,4,9,9a-tetrahydro-1H-2,4a,5-triaza-fluorene-2-carboxylic acid tert-butyl ester

Participants

Reaction Steps

To the solution of 0.16 g (0.36 mmol) (4R,9aR)-4-methyl-6-[2-(tetrahydro-pyran-2-yloxy)-ethoxymethyl]-3,4,9,9a-tetrahydro-1H-2,4a,5-triaza-fluorene-2-carboxylic acid tert-butyl ester in 3 ml methanol was added 0.136 g (0.71 mmol) para-toluenesulphonic acid. After 30 min, the solvent was removed on a rotary evaporator and the residue was chromatographed on silica gel (0.032–0.063 mm) with dichloromethane:methanol:ammonia (19:1:0.1) as eluant to afford the desired compound as a light yellow oil (71.6%).

Provenance & Evidence