反应详情

To a solution of the above crude 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 in THF (300 mL) was added tetrabutylammonium fluoride (10.0 mL, 1 M in THF, 10.0 mmol). The resulting solution was then stirred at RT for 1 h. The reaction mixture was added into a saturated aqueous solution of NH4Cl (350 mL) and extracted with EtOAc (2×350 mL). Combined organic layers were washed with Brine (2×400 mL) and dried over MgSO4. The solution was then concentrated. The resulting residue was purified on a silica gel column using a mixture of DCM and MeOH 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 (2.3 g, 61% over two steps). LRMS (M+H+) m/z 375.1.

1. extractionextracted with EtOAc (2×350 mL)
2. washCombined organic layers were washed with Brine (2×400 mL)
3. dry with materialdried over MgSO4
4. concentrationThe solution was then concentrated
5. customThe resulting residue was purified on a silica gel column
6. additiona mixture of DCM and MeOH