2,6-Lutidine → HCID 87141533, compound

Temperature

-15 °C

To a solution of secondary alcohol 12 (5.04 g, 19.23 mmol) in CH2Cl2 (150 mL) at −15° C. was added 2,6-lutidine (3.4 mL, 28.85 mmol) and TBSOTf (6.2 mL, 26.92 mmol). After stirring at −15° C. for 1 h, the reaction mixture was quenched with MeOH (20 mL) at −15° C. The mixture was treated with saturated NH4Cl aqueous solution. The organic layer was separated and the aqueous layer was extracted with CH2Cl2 (3×). The combined organic layers were washed with brine, dried (MgSO4), filtered and concentrated. Purification of the crude product by flash chromatography (EtOAc-hexanes, 1:9) to afford bromide 13 (6.6 g, 91%) as a yellow oil. [α]20D 2.76 (c 1.5, CHCl3); 1H NMR (CDCl3, 400 MHz): δ 5.61 (m, 1 H), 5.35 (d, 1 H, J=9.8 Hz), 5.23 (m, 2 H), 3.88 (s, 2H), 3.48 (dd, 1 H, J=3.0, 7.1 Hz), 3.30 (t, 1 H, J=7.5 Hz), 3.15 (s, 3H), 2.53 (m, 1H), 1.75 (s, 3H), 0.88 (m+s, 12 H), 0.05 (s, 3H), 0.02 (s, 3H); 13C NMR (100 MHz, CDCl3): δ 136.8, 135.6, 130.1, 119.2, 86.5, 78.0, 56.6, 35.1, 32.8, 26.5, 22.3, 18.9, 13.9, −3.4, −4.4; HRMS (ESI) calcd for [C17H33BrO2Si+Na]+: 399.1331. found: 399.1321.

1. customthe reaction mixture was quenched with MeOH (20 mL) at −15° C
2. additionThe mixture was treated with saturated NH4Cl aqueous solution
3. customThe organic layer was separated
4. extractionthe aqueous layer was extracted with CH2Cl2 (3×)
5. washThe combined organic layers were washed with brine
6. dry with materialdried (MgSO4)
7. filtrationfiltered
8. concentrationconcentrated
9. customPurification of the crude product by flash chromatography (EtOAc-hexanes, 1:9)

ORD record

ord-39455046c24e4e0fbf243bdd25e588d6

Source dataset

uspto-grants-2016_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09303009B2