Tetrabutylammonium Fluoride → 3-(2-chloro-3-fluorobenzyl)-1-((S)-1-((R)-2,2-dimethyl-1,3-dioxolan-4-yl)-3-hydroxypropan-2-yl)-1-methylurea

To a solution of 1-((S)-1-(tert-butyldimethylsilyloxy)-3-((R)-2,2-dimethyl-1,3-dioxolan-4-yl)propan-2-yl)-3-(2-chloro-3-fluorobenzyl)-1-methylurea (11.4 g, 23 mmol) in THF at 0° C., was added TBAF (23 mmol, 1 equiv.) dropwise. The reaction was completed in 30 min. The solvents were removed. The residue was dissolved in EtOAc (150 mL) and washed with 3% citric acid (150 mL) twice, followed by saturated NaHCO3 (100 mL) and brine (100 mL). The organic layer was concentrated to give 3-(2-chloro-3-fluorobenzyl)-1-((S)-1-((R)-2,2-dimethyl-1,3-dioxolan-4-yl)-3-hydroxypropan-2-yl)-1-methylurea, which was used without further purification. LRMS (M+H+) m/z 375.4.