2,4,5-Trimethyloxazole → 4-(1,3,3a,4,7,7a-Hexahydro-4,6,7-trimethyl-1,3-dioxo-4,7-epoxy-2H-pyrrolo[3,4-c]pyridin-2-yl)-2-(trifluoromethyl)benzonitrile

Participants

Reaction Conditions

Reaction Steps

2,4,5-Trimethyl oxazole (0.48 mL, 4.14 mmol) was dissolved in toluene (2.0 mL) and 4-(2,5-dihydro-2,5-dioxo-1H-pyrrol-1-yl)-2-trifluoromethylbenzonitrile (1.00 g, 3.76 mmol) was added. The reaction mixture was stirred at 75° C. under nitrogen for 2.5 hrs. The solution was cooled to room temperature and the resulting precipitate was filtered and rinsed with toluene to give 0.51 g (35%) of compound 211 as a light grey solid. NMR analysis revelaed that compound 211 was one isomer (exo/endo) however the identity of the isomer could not be determined by NMR analysis. HPLC: 100% at 2.85 min (retention time) (YMC S5 ODS column 4.6×50 mm eluting with 10-90% aqueous methanol over 4 minutes containing 0.1% TFA, 4 mL/min, monitoring at 220 nm). MS (ES): m/z 378.42 [M+H]+.

Provenance & Evidence