4-chloro-2-iodophenol

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 4-chloro-2-iodo-phenol 4b (20.32 g, 0.08 mol), (1-benzyl-1,2,3,6-tetrahydro-pyridin-4-yl)-methanol (20.5 g, 0.08 mol) and triphenylphosphine (23.58 g, 0.09 mol) in dry THF (150 mL) was added DEAD (17.4 g, 0.09 mol) at 0° C. under nitrogen atmosphere. After addition, the mixture was stirred at room temperature overnight. The mixture was concentrated to dryness and the residue was basified by Na2CO3 solution (10% 100 mL) and extracted with ethyl acetate (100 mL×3). The combined organic layers were washed with water (100 mL×2) and brine (200 mL), dried over Na2SO4, concentrated to dryness. The residue was purified by column on silica gel to afford 1-benzyl-4-(4-chloro-2-iodo-phenoxymethyl)-1,2,3,6-tetrahydro-pyridine 4c. 1H NMR (400 MHz, CDCl3): δ 7.73 (d, J=2.4 Hz, 1H), 7.22-7.38 (m, 6H), 6.70 (d, J=8.8 Hz, 1H), 5.82 (s, 1H), 4.43 (s, 2H), 3.63 (s, 2H), 3.05 (s, 2H), 2.67 (t, J=5.6 Hz, 2H), 2.28 (s, 2H). After addition The mixture was concentrated to dryness extracted with ethyl acetate (100 mL×3) The combined organic layers were washed with water (100 mL×2) and brine (200 mL) dried over Na2SO4 concentrated to dryness The residue was purified by column on silica gel

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4-Chloro-2-iodophenol (85 g, 0.33 mol) was dissolved in 150 ml of DMF, followed by the addition of 32.5 g (0.36 mol) of copper cyanide. The resulting mixture was refluxed for 2 hours and then concentrated under reduced pressure. The residue was dissolved in ethyl acetate, and the thus-prepared solution was washed with water. Subsequent to elimination of an undissolved salt, the solution was concentrated under reduced pressure, whereby 40.4 g of 5-chloro-2-hydroxybenzonitrile were obtained (yield: 80%). Without purification, it was provided for use in the next step. The resulting mixture was refluxed for 2 hours concentrated under reduced pressure The residue was dissolved in ethyl acetate the thus-prepared solution was washed with water Subsequent to elimination of an undissolved salt, the solution was concentrated under reduced pressure