tert-butyl N-(3-hydroxy-3-phenylpropyl)carbamate

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: The title compound was prepared by the method of Example 3 (b) using racemic (3-hydroxy-3-phenylpropyl)carbamic acid 1,1-dimethylethyl ester and 2,4-dichloro-1-(trifluoromethyl)benzene to give 70 mg of the product as a colourless solid.

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of (3-hydroxy-3-phenyl-propyl)-carbamic acid tert-butyl ester (10.4 g, 41.4 mmol), phthalimide (5.2 g, 36.6 mmol), and PPh3 (14.6 g, 55.5 mmol) in THF (204 mL) was added dropwise DEAD (8.9 mL, 55 mmol) with stirring at 0° C. Then the resulting mixture was warmed to room temperature for an additional 2 hours. The mixture was concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (petroleum ether:ethyl acetate, 3:1) to give [3-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)-3-phenyl-propyl]-carbamic acid tert-butyl ester. (Yield 10.5 g, 66.8%). Then the resulting mixture was warmed to room temperature for an additional 2 hours The mixture was concentrated under reduced pressure The residue was purified by column chromatography on silica gel (petroleum ether:ethyl acetate, 3:1)

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of (3-hydroxy-3-phenyl-propyl)-carbamic acid tert-butyl ester (10.4 g, 41.4 mmol), phthalimide (5.2 g, 36.6 mmol), and PPh3 (14.6 g, 55.5 mmol) in THF (204 mL) was added dropwise DEAD (8.9 mL, 55 mmol) with stirring at 0° C. Then the resulting mixture was warmed to room temperature for an additional 2 hours. The mixture was concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (petroleum ether:ethyl acetate, 3:1) to give [3-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)-3-phenyl-propyl]-carbamic acid tert-butyl ester. (Yield 10.5 g, 66.8%). 1H NMR (300 MHz, CDCl3): δ 7.81-7.75 (m, 2H), 7.69-7.64 (m, 2H), 7.53-7.50 (m, 2H), 7.34-7.23 (m, 3H), 5.44-5.38 (m, 1H), 4.74 (brs, 1H), 3.29-3.07 (m, 2H), 2.83-2.75 (m, 1H), 2.51-2.42 (m, 1H), 1.42 (s, 9H). LC-MS: [M-Boc+H]+ 281. Then the resulting mixture was warmed to room temperature for an additional 2 hours The mixture was concentrated under reduced pressure The residue was purified by column chromatography on silica gel (petroleum ether:ethyl acetate, 3:1)