反应详情

A solution of (3R)-ethyl 2-amino-3-ethyl-5-methylnon-8-enoate hydrochloride (2.99 g, 10.77 mmole) in DCM (20 mL) was added DIPEA (1.08 mL, 10.77 mmole) followed by (BOC)2O (2.39 mL, 10.77 mmole) at room temperature. The reaction mass was stirred at room temperature for overnight. The reaction mass was diluted with DCM and washed with water. The organic layer was dried over anhydrous Na2SO4 and evaporated under reduced pressure to get crude compound. The crude compound was purified by column chromotography (Silica gel, 20% ethyl acetate in pet-ether) to get 2.3 g, (62.5%) of (3R)-ethyl 2-(tert-butoxycarbonylamino)-3,5-dimethylnon-8-enoate as an oily liquid. MS: MS m/z 342.4 (M++1).

1. washwashed with water
2. dry with materialThe organic layer was dried over anhydrous Na2SO4
3. customevaporated under reduced pressure
4. customto get crude compound
5. customThe crude compound was purified by column chromotography (Silica gel, 20% ethyl acetate in pet-ether)