Methanesulfonyl chloride → methanesulfonic acid 3-(3-cyano-1H-indol-4-yl)-3-phenyl-propyl ester

Participants

Reaction Conditions

Reaction Steps

To a 0° C. solution of 4-(3-hydroxy-1-phenyl-propyl)-1H-indole-3-carbonitrile LX (377 mg, 1.36 mmol) in THF/DCM (1/1, 22 ml) was added MsCl (105 μl, 1.36 mmol) dropwise. The mixture was stirred at 0° C. for 10 minutes, and TEA (226 μl, 1.62 mmol) was added dropwise. The resulting mixture was stirred at 0° C. for 2.5 hours, poured into ice/water, and extracted with EtOAc. The combined organic layers were dried over Na2SO4, filtered, and concentrated affording methanesulfonic acid 3-(3-cyano-1H-indol-4-yl)-3-phenyl-propyl ester (not shown in above scheme) as a yellow oil. A solution of this crude mesylate in MeNH2 (33% in EtOH, 8.5 ml) was placed in a sealed tube and stirred at 100° C. for 45 minutes. The reaction mixture was concentrated, and the residue was partitioned between a saturated solution of NaHCO3 and EtOAc: The aqueous layer was extracted twice with EtOAc. The combined organic layers were dried over Na2SO4, filtered, concentrated, and purified via flash chromatography (DCM/MeOH/NH4OH) affording 4-(3-methylamino-1-phenyl-propyl)-1H-indole-3-carbonitrile LXI as a white foamy solid (346 mg). MS (M+H)=290.

Provenance & Evidence