Thiazolidinedione → HCID 85051391, compound

Participants

Reaction Steps

To a solution of toluene (50 mL) containing piperidine (0.84 mL, 8.53 mmol) and acetic acid (0.84 mL) was added 2,4-thiazolidinedione (3.3 g, 28.43 mmol) and 4-trifluoromethoxy-3-(3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydronaphthalen-2-yl)benzaldehyde (11.1 g, 28.43 mmol). The reaction mixture was heated at reflux with continuous removal of water using a Dean-Stark water separator. After 12 hours at reflux 25 mL of toluene was removed by distillation and the solution was cooled to room temperature. The yellow solid was collected and taken up in ethanol (40 ml). After stirring at room temperature for 15 minutes, the pale yellow solid was collected and washed with a minimum of ethanol, dried under vacuum to give 6.6 g of 3-(3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydro-2-naphthyl)-4-trifluoromethoxybenzylidene-2,4-thiazolidinedione. The organic layers were combined and evaporated. Further crystallization from ethanol afforded an additional 2.0 g to give a total of 8.6 g (61%) of product. 1H NMR (300 MHz; DMSO-d6): 1.21 (s, 6H); 1.27 (s, 6H); 1.65 (s, 4H); 2.04 (s, 3H); 7.08 (s, 1H); 7.26 (s, 1H); 7.62 (m, 2H); 7.70 (dd, J1=8.0 Hz, J2=1.52 Hz, 1H); 7.86 (s, 1H); 12.5 (s, 1H).

Provenance & Evidence