Cesium carbonate → HCID 69357547, compound

Participants

Reaction Conditions

Reaction Steps

A flask was charged under nitrogen with 3-bromo-5-iodo-benzoic acid tert-butyl ester (D8b) (6.42 g, 16.7 mmol, 1 equiv), Cs2CO3 (7.6 g, 23.4 mmol, 1.4 equiv), tris(dibenzylideneacetone)dipalladium(0) (307 mg, 0.33 mmol, 0.02 equiv), Xantphos (578 mg, 1 mmol, 0.06 equiv) and dioxan (120 ml). δ-Valerolactam (1.9 ml, 20 mmol, 1.2 equiv) was then added via syringe and the resulting mixture was stirred at 60° C. for 40 h then cooled to room temperature and concentrated in vacuo. The residue was partitioned between H2O and AcOEt and the aqueous phase was re-extracted with AcOEt. The combined organic solutions were dried over MgSO4 and concentrated in vacuo Purification by flash chromatography on silica gel (iso-hexane/AcOEt: 3/1 to 1/1) gave 3-bromo-5-(2-oxo-piperidin-1-yl)-benzoic acid tert-butyl ester (D10) (4 g, 68%) as a white solid. RT=2.88 min

Provenance & Evidence