N-bromobutanimide → tert-Butyl {(3R)-1-[7-bromo-5-(2-chlorobenzyl)-1,3-dimethyl-2,4-dioxo-2,3,4,5-tetrahydro-1H-pyrrolo[3,2-d]pyrimidin-6-yl]piperidin-3-yl}carbamate

Participants

Reaction Steps

To a solution of tert-butyl {(3R)-1-[5-(2-chlorobenzyl)-1,3-dimethyl-2,4-dioxo-2,3,4,5-tetrahydro-1H-pyrrolo[3,2-d]pyrimidin-6-yl]piperidin-3-yl}carbamate (1.00 g) in N,N-dimethylformamide (20 ml) was added N-bromosuccinimide (392 mg), and the resulting mixture was stirred overnight at room temperature. The reaction solution was adjusted to pH 2 with a 10% aqueous potassium hydrogensulfate solution and extracted with ethyl acetate (200 ml). The organic layer was washed with a 10% aqueous potassium hydrogensulfate solution and a saturated aqueous sodium chloride solution, dried over sodium sulfate and then filtered and the filtrate was concentrated under reduced pressure. The resulting residue was purified by a silica gel column chromatography (hexane/ethyl acetate=2/1) to obtain the title compound (1.143 g).

Provenance & Evidence