Iodine → HCID 10476981, compound

Participants

Reaction Steps

N-Allyl-N-carbobenzyloxy-4-(3-pyridyl)-3,5-difluoroaniline (PREPARATION 4, 496 mg 1.31 mmol) in chloroform (25 ml), pyridine (1.58 ml, 19.6 mmol, 15 eq) and iodine (4.97 g, 19.6 mmol, 15 eq) are combined. The resulting mixture is placed under an atmosphere of nitrogen and heated to 50° with stirring. After 1.5 hr, the reaction is decanted into chloroform (70 ml). The remaining sludge is rinsed with chloroform (3×15 ml). The combined organics are washed with sodium thiosulfate (20%), then brine, dried (sodium sulfate), filtered and concentrated under reduced pressure to give a solid. This material is purified by silica gel chromatography (100 g) eluting with methanol/chloroform (0.5/99.5-1 l, 1/99, 1 l). The appropriate fractions are pooled and concentrated to give the title compound, mp 133°-134°; FTIR (mull) cm-1 3130, 1758, 1650, 1414, 1241, 1017 and 846; NMR (CDCl3) 8.72, 8.62, 7.79, 7.43-7.38, 7.32, 4.84-4.72, 4.19, 3.80, 3.51 and 3.39 δ.

Provenance & Evidence