3-(Methylthio)-1-propanol → Ethyl 3,4-bis(benzyloxy)-5-(dimethylcarbamoyl)-1-(4-(3-(methylthio)propoxy)phenyl)-1H-pyrrole-2-carboxylate

Participants

Reaction Steps

To a stirred solution of ethyl 3,4-bis(benzyloxy)-5-(dimethylcarbamoyl)-1-(4-hydroxyphenyl)-1H-pyrrole-2-carboxylate (36) (350 mg, 0.68 mmol) in THF (2 mL) at 0° C. was added 3-(methylthio)propan-1-ol (84 μL, 0.82 mmol), triphenylphosphine (214 mg, 0.82 mmol), and DIAD (159 μL, 0.82 mmol). After 2 h further portions of 3-(methylthio)propan-1-ol (84 μL, 0.82 mmol), triphenylphosphine (214 mg, 0.82 mmol) and DIAD (159 μL, 0.82 mmol) were added, and the reaction mixture was allowed to stir at RT for 4 days. The reaction mixture was quenched with water (10 mL) and extracted with EtOAc (2×20 mL), the combined organics were washed with brine (30 mL), dried (MgSO4) filtered and concentrated in vacuo. The crude product was purified by silica gel chromatography (12 g, 0-100% EtOAc in isohexane) to afford ethyl 3,4-bis(benzyloxy)-5-(dimethylcarbamoyl)-1-(4-(3-(methylthio)propoxy)phenyl)-1H-pyrrole-2-carboxylate (43) (389 mg, 85%) as a clear yellow oil: m/z 603 (M+H)+ (ES+).

Provenance & Evidence