Water → 3,4-Dihydro-1-methyl-7-phenylpyrrolo[1,2-a]pyrazine fumarate

Participants

Reaction Steps

2-Acetyl-4-phenylfuran (0.7 g) was heated at 100° C. for 1 hour under argon with 0.8 ml of 1,2-ethanediamine and 0.1 ml of water. After cooling 50 ml of water were added and the mixture was extracted three times with 50 ml of methylene chloride each time. The organic phases were combined, dried with MgSO4 and freed from solvent. The residue, 0.7 g of brown oil, was chromatographed on 60 g of silica gel with methylene chloride/methanol (19:1) as the eluent. The crude product, 0.4 g of brown solid, was dissolved in a 50-fold amount of hot ethanol and treated with 1.1 equivalents of a saturated solution of fumaric acid in ethanol. There was obtained 0.4 g (31%) of 3,4-dihydro-1-methyl-7-phenylpyrrolo[1,2-a]pyrazine fumarate (1:1); m.pt.: 181° C. (dec.)

Provenance & Evidence