反应详情

To a cold (0° C.) solution of (2-chloro-benzyl)-((rac)-2-methyl-pyrrolidin-2-ylmethyl)-amine (0.5 g, 1 eq) in DCM (15 mL) was added a solution of triphosgene (0.5 eqv) in DCM (5 mL) over a period of 5 minutes followed by the addition of triethylamine (3 eq). The reaction mixture was allowed to stir for 4 h. After the completion of the reaction on TLC, the reaction mixture was quenched with 1M HCl (10 mL) and extracted with DCM (3×50 mL). The organic layer was dried over anhydrous sodium sulfate and concentrated using rotary evaporator to give sticky crude, which was then purified with column chromatography (1-2% Methanol:DCM, Mesh Size-100-200 silica, Diameter of column—2.5 cm, Height of silica—approx. 5 inch) to afford the desired product (rac)-2-(2-chloro-benzyl)-7a-methyl-hexahydro-pyrrolo[1,2-c]imidazol-3-one as white solid (22-70%). MS (ES+): 265.5 (MH+))

1. customAfter the completion of the reaction on TLC
2. customthe reaction mixture was quenched with 1M HCl (10 mL)
3. extractionextracted with DCM (3×50 mL)
4. dry with materialThe organic layer was dried over anhydrous sodium sulfate
5. concentrationconcentrated
6. customevaporator
7. customto give sticky crude, which
8. customwas then purified with column chromatography (1-2% Methanol:DCM, Mesh Size-100-200 silica, Diameter of column—2.5 cm, Height of silica—approx. 5 inch)