Aminoacetaldehyde dimethyl acetal → HCID 178495890, compound

Participants

Reaction Steps

A solution of 5-chloro-7-(4-(trifluoromethyl)phenyl)-2,3-dihydrobenzo[f][1,4]oxazepine (11.7 mmol) in 2,2-dimethoxyethanamine (20 mL) was heated at 100° C. for 1 hour. The reaction mixture was concentrated to give (Z)-2,2-dimethoxy-N-(7-(4-(trifluoromethyl)phenyl)-3,4-dihydrobenzo[f][1,4]oxazepin-5(2H)-ylidene)ethanamine as an oil. The crude material was dissolved in toluene (80 mL) and PPTS (6.0 g) was added and the mixture was refluxed for 5 h. The reaction mixture partitioned between ethyl acetate and brine and filtered through celite. The organic layer was dried with sodium sulfate and concentrated before being purified by silica gel chromatography (Rf=0.15 in 2:1 hexanes/ethyl acetate) to give 10-(4-(trifluoromethyl)phenyl)-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepine as a white solid (2.3 g, 60% over three steps). C18H13F3N2O×TFA. 331.1 (M+1). 1H NMR (DMSO) δ 8.53 (d, J=2.0 Hz, 1H), 7.99 (d, J=8.0 Hz, 2H), 7.91 (dd, J=8.0, 2.0 Hz, 1H), 7.87 (d, J=8.0 Hz, 2H), 7.77 (d, J=12.0 Hz, 2H), 7.30 (d, J=8.8 Hz, 1H), 4.65 (m, 4H). 19F NMR (DMSO) δ −59.21 (s, 3F).

Provenance & Evidence