Water → 6'-hydroxyspiro(9H-fluorene-9,3'-piperidine)-2'-one

Participants

Reaction Steps

A solution of N-benzyltrimethylammonium hydroxide (Triton B) which is a 40% methanolic solution (3.5 ml) in acetonitrile (10 ml) was added dropwise over 0.25 hour to a suspension of 9-carbamoylfluorene (20.9 g) in acetonitrile (100 ml) keeping the temperature below 25° C. The reaction mixture was stirred at room temperature for 2 hours. Water (300 ml) was then added slowly over 1 hour and the crystallised product was isolated by filtration, washed with water and dried in vacuo overnight at 50° C. 89%, melting point 201°-205° C. (decomp). The product was identical spectroscopically to that prepared in Example 1.

Provenance & Evidence