Tert-butyl (3-bromo-2-chloro-5-cyanophenyl)(4-methoxybenzyl)carbamate → Tert-butyl 3-(3-((tert-butoxycarbonyl)(4-methoxybenzyl)amino)-2-chloro-5-cyanophenyl)azetidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of tert-butyl (3-bromo-2-chloro-5-cyanophenyl)(4-methoxybenzyl)carbamate (1 g, 1.882 mmol), dichloro[1,1′-bis(diphenylphosphino)ferrocene]palladium(II) (0.129 g, 0.188 mmol), and copper(I) iodide (0.072 g, 0.376 mmol) in N,N-Dimethylacetamide (0.6 mL) in a dry microwave vial was evacuated and backfilled with N2 for 3 times. (1-(tert-butoxycarbonyl)azetidin-3-yl)zinc(II) iodide (5.94 mL, 5.64 mmol, approximately 0.95 M solution in N,N-dimethylacetamide prepared as described in the Journal of Organic Chemistry, 2004, 69, 5120) was then added. The mixture was evacuated and backfilled with N2 one more time and then heated at 80° C. for overnight. After cooling to room temperature, the reaction was partitioned between EtOAc and sat. aq. NH4Cl solution. This was left stirring for 30 min. The aqueous phase was extracted with EtOAc and the combined organic phases were washed with brine and dried with sodium sulfate. Removal of the solvents followed by silica gel chromatography eluting with hexane containing 5 to 15% EtOAc to afford tert-butyl 3-(3-((tert-butoxycarbonyl)(4-methoxybenzyl)amino)-2-chloro-5-cyanophenyl)azetidine-1-carboxylate (0.98 g).

Provenance & Evidence