反应详情

温度

100 °C

A flask was charged with (S)-2-(2-Amino-7-(4-chlorophenyl)-5-methylbenzo[d]thiazol-6-yl)-2-tert-butoxyethyl pivalate (2.15 g, 4.52 mmol), LiOH monohydrate (2.00 g, 47.4 mmol), H2O (4 mL), EtOH (absolute, 4.0 mL), and THF (8.0 mL). The reaction was placed under N2 and heated to 100° C. After 2 h, the reaction was cooled to 23° C., diluted with H2O, and extracted with EtOAc several times. The combined organic phases were dried (Na2SO4), filtered, and concentrated. The residue was treated with benzene and purified via chromatography on silica gel (80 g “gold” ISCO column; Hex/EtOAc) giving (S)-2-(2-amino-7-(4-chlorophenyl)-5-methylbenzo[d]thiazol-6-yl)-2-tert-butoxyethanol (1.10 g, 62% yield). LCMS-ESI+: calc'd for C20H23ClN2O2S: 391.1 and 393.1 (M+H+); found: 391.2 and 393.2 (M+H+). 1H-NMR: 400 MHz, (CDCl3) δ: 7.49-7.41 (m, 2H), 7.36-7.32 (m, 2H), 7.20 (d, J=7.3 Hz, 1H), 5.39 (s, broad, 2H), 4.52-4.50 (m, 1H), 3.85-3.70 (m, 2H), 2.63 (s, 3H), 0.99 (s, 9H).

1. temperaturethe reaction was cooled to 23° C.
2. extractionextracted with EtOAc several times
3. dry with materialThe combined organic phases were dried (Na2SO4)
4. filtrationfiltered
5. concentrationconcentrated
6. additionThe residue was treated with benzene
7. custompurified via chromatography on silica gel (80 g “gold” ISCO column; Hex/EtOAc)