反应详情

To a solution of (S)-1-(1-chloro-3-methylnaphthalen-2-yl)ethane-1,2-diol (4E) (0.920 g, 3.89 mmol) in pyridine (5.0 mL)/dichloromethane (15.0 mL) was added pivaloyl chloride (0.574 mL, 4.67 mmol). The reaction mixture was stirred for 18 h at room temperature. The reaction was incomplete and additional pivaloyl chloride (0.574 mL, 4.67 mmol) was added. After stirring for 1 h, the reaction mixture was quenched with 1 N HCl and diluted with ethyl acetate. The organic layer was washed with 1 N HCl, saturated sodium bicarbonate solution, dried (MgSO4), filtered, concentrated and purified by flash column chromatography (silica gel, 0 to 30% ethyl acetate/hexanes) to give 4F as a colorless oil (1.139 g). LCMS-ESI+ (m/z): [M—O]+ calcd for C18H21ClO2: 304.80. Found: 303.0, 305.0.

1. stirringAfter stirring for 1 h
2. customthe reaction mixture was quenched with 1 N HCl
3. additiondiluted with ethyl acetate
4. washThe organic layer was washed with 1 N HCl, saturated sodium bicarbonate solution
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. concentrationconcentrated
8. custompurified by flash column chromatography (silica gel, 0 to 30% ethyl acetate/hexanes)