Benzyl Alcohol → Benzyl [1-(3-methoxyphenyl)-1-methylethyl]carbamate

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-(3-methoxy-phenyl)-2-methyl-propionic acid (D99) (1 g, 5.15 mmol, 1 equiv) in toluene (20 ml) at room temperature was added NEt3 (1.07 ml, 7.72 mmol, 1.5 equiv) and then diphenylphosphoryl azide (2.2 ml, 10.3 mmol, 2 equiv). The resulting mixture was then heated at 80° C. for 2 h then benzyl alcohol (1.61 ml, 15.45 mmol, 3 equiv) was added and the solution heated for a further 2 h, cooled to room temperature and partitioned between EtOAc and a saturated NaHCO3 aqueous solution. The two layers were separated and the aqueous phase dried over MgSO4 and concentrated. in vacuo. Purification of the residue by flash chromatography on silica gel (iso-hexane/AcOEt: 9/1) gave [1-(3-methoxy-phenyl)-1-methyl-ethyl]-carbamic acid benzyl ester (D100) (1 g, 65%) a yellow gum.

Provenance & Evidence