Pivalaldehyde → HCID 89566844, compound

Temperature

40 °C

To a solution of crude 3,6-diiodo-4-nitroanisole (770 mg, 80% purity, 1.52 mmol) in anhydrous THF (10 mL) at minus 40° C. under a nitrogen atmosphere, phenylmagnesium chloride (2 M in THF, 0.46 mL, 0.92 mmol) was added dropwise at a rate such that the temperature would not exceed minus 35° C. Upon completion of the addition, the mixture was stirred at minus 40° C. for two hours, followed by addition of trimethylacetaldehyde (0.22 mL, 1.97 mmol). The mixture was stirred at minus 30° C. for two hours and then at room temperature for another one hour. The reaction was then quenched with brine (1.0 mL), diluted with CH2Cl2 (100 mL), and the solution was washed with CH3COOH (0.1 N, 50 ml) and brine (50 ml) sequentially. The organic phase was dried over Na2SO4, concentrated in vacuo, and the residue was purified by silica gel column chromatography to yield racemic (R/S)-1-(4-iodo-5-methoxy-2-nitrophenyl)-2,2-dimethyl-1-propanol (399 mg, 72%). 1H NMR (400 MHz, CDCl3): δ 8.32 (s, 1H, Ph-H), 7.17 (s, 1H, Ph-H), 5.60 (d, 1H, J=4.0 Hz, PhCH), 3.98 (s, 3H, OCH3), 2.12 (d, 1H, J=4.0 Hz, OH), 0.89 (s, 9H,C(CH3)3).

1. customexceed minus 35° C
2. additionUpon completion of the addition
3. stirringThe mixture was stirred at minus 30° C. for two hours
4. waitat room temperature for another one hour
5. customThe reaction was then quenched with brine (1.0 mL)
6. additiondiluted with CH2Cl2 (100 mL)
7. washthe solution was washed with CH3COOH (0.1 N, 50 ml) and brine (50 ml) sequentially
8. dry with materialThe organic phase was dried over Na2SO4
9. concentrationconcentrated in vacuo
10. customthe residue was purified by silica gel column chromatography

ORD record

ord-e84a60472557449aa0b1ceb6c780e136

Source dataset

uspto-grants-2014_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08889860B2