Tri-tert-butylphosphine tetrafluoroborate → HCID 66649728, compound

Participants

Reaction Steps

To a degassed solution of (3aR*,7S*,7aS*)-7-(4-amino-3-fluoro-5-iodo-benzyl)-3-(3-tert-butyl-benzyl)-5,5-dioxo-hexahydro-1-oxa-5lambda*6*-thia-3-aza-inden-2-one (example 1k) (0.60 g, 1 mmol) in anhydrous dioxane (4 mL) was added under argon Cs2CO3 (0.665 g, 2.0 mmol), 2,4,6-trivinyl-cyclotriboroxane pyridine complex (0.365 g, 1.5 mmol) and tri-tert-butyl-phosphonium tetrafluoroborate (0.044 g, 0.15 mmol) in dioxane was added under argon the Pd2(dba)3 (0.028 g, 0.03 mmol) and the reaction mixture was heated at reflux for 2 h. The reaction mixture was diluted with EtOAc and the organic layer was washed with water and brine, dried over MgSO4, filtered and evaporated. The title compound was obtained after flash-chromatography on silica gel (hexane-EtOAc 3:1 to 2:1) and crystallization from CH2Cl2-hexane as white crystals: HPLC RtA=2.22 min; ESIMS [M+NH4]+=504.

Provenance & Evidence