Toluene → 2-(Propan-2-yl)-1,3-oxazinane

Participants

Reaction Steps

To a solution of 3-aminopropanol (91 g, 65.4 mmol) in toluene (100 mL) was added isobutraldehyde (9.0 mL, 99.1 mmol, 1.5 equiv.) and MgSO4 (7.5 g) to generate an exotherm. The slurry was stirred for 30 min. and an additional portion of MgSO4 was added (7.5 g), and the slurry was stirred overnight. The resulting mixture was filtered and concentrated under reduced pressure. The condensate was again concentrated under reduced pressure and the two residues were combined to afford 2isopropyltetrahydro-1,3-oxazine as a colorless oil (5.18 g, 61%) 1H NMR (CDCl3) δ0.84-0.88 (m, 6H), 1.24-1.29 (m, 1H), 1.51-1.66 (m, 3H), 2.77-2.87 (m, 1H), 3.07-3.13 (m, 1H), 3.60-3.76 (m, 2H), 4.00-4.05 (m, 1H).

Provenance & Evidence