Triethylamine → Tert-butyl 3-bromo-5-(5-oxa-6-azaspiro[3.4]oct-6-en-7-yl)benzoate

Participants

Reaction Conditions

Reaction Steps

To a solution of tert-butyl 3-bromo-5-[(E)-(hydroxyimino)methyl]benzoate (5.26 g, 17.5 mmol) in N,N-dimethylformamide (80 mL)) was added N-chlorosuccinimide (2.57 g, 19.3 mmol). The reaction mixture was heated to 50° C. After 1 h, the reaction was cooled to ambient temperature and methylenecyclobutane (6.49 mL, 70.1 mmol) was added. Triethylamine (12.2 mL, 88.0 mol) was added. The mixture was stirred at ambient temperature. After 10 min, saturated aqueous NaHCO3 was added and the mixture was extracted with ethyl acetate (3×). The combined organic extracts were washed with water (2×), brine, dried over sodium sulfate, filtered and concentrated. Purification by silica gel chromatography (100% hexanes→90% hexanes/ethyl acetate) gave the title compound (2.86 g). MS 366 (M).

Provenance & Evidence