反应详情

温度

-78 °C

Indole-3-acetic acid (13 g, 74 mmol) was taken up in 130 mL anhydrous THF in a flame-dried, 2-necked 1 L round-bottomed flask, under an inert atmosphere, and cooled to −78° C. (dry ice/acetone bath). A 1.0 M THF solution of LHMDS (163 mL, 0.163 mol) was added via syringe over 30 minutes, and the reaction mixture allowed to stir for an additional 30 minutes at −78° C. once the addition was complete. Next, benzyl chloroformate (11.7 mL, 13.9 g, 81.6 mmol) was added dropwise via syringe. Stirring was then continued for 1 hour. To work up the reaction mixture, it was quenched with 2 M HCl, and partitioned between 2 M HCl and ethyl acetate. The aqueous layer was extracted with additional ethyl acetate, and the combined organic layers washed with brine, dried over anhydrous MgSO4, filtered, and evaporated to give a white solid with a pinkish tinge (22.49 g, 98% yield): 1H NMR (400 MHz, DMSO-d6) δ 3.71 (s, 2H) 5.47 (s, 2H) 7.27 (t, J=7.2 Hz, 1H) 7.32-7.47 (m, 4H) 7.54 (d, J=6.8 Hz, 2H) 7.58 (d, J=7.6 Hz, 1H) 7.68 (s, 1H) 8.08 (d, J=8.1 Hz, 1H) 12.43 (s, 1H); HRMS (ESI+) calcd for C18H16NO4 (MH+) 310.1074. found 310.1080.

1. additionthe addition
2. stirringStirring
3. waitwas then continued for 1 hour
4. customwas quenched with 2 M HCl
5. custompartitioned between 2 M HCl and ethyl acetate
6. extractionThe aqueous layer was extracted with additional ethyl acetate
7. washthe combined organic layers washed with brine
8. dry with materialdried over anhydrous MgSO4
9. filtrationfiltered
10. customevaporated
11. customto give a white solid with a pinkish tinge (22.49 g, 98% yield)